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Relevant bibliographies by topics / Cowpea (vigna unguiculata (l.)

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Academic literature on the topic 'Cowpea (vigna unguiculata (l.)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Cowpea (vigna unguiculata (l.)"

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Ehlers, J. D., and A. E. Hall. "Cowpea (Vigna unguiculata L. Walp.)." Field Crops Research 53, no. 1-3 (July 1997): 187–204. http://dx.doi.org/10.1016/s0378-4290(97)00031-2.

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Kongjaimun, Alisa, Akito Kaga, Norihiko Tomooka, Prakit Somta, Takehiko Shimizu, Yujian Shu, Takehisa Isemura, Duncan A. Vaughan, and Peerasak Srinives. "An SSR-based linkage map of yardlong bean (Vigna unguiculata (L.) Walp. subsp. unguiculata Sesquipedalis Group) and QTL analysis of pod length." Genome 55, no. 2 (February 2012): 81–92. http://dx.doi.org/10.1139/g11-078.

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Yardlong bean (Vigna unguiculata (L.) Walp. subsp. unguiculata Sesquipedalis Group) (2n = 2x = 22) is one of the most important vegetable legumes of Asia. The objectives of this study were to develop a genetic linkage map of yardlong bean using SSR makers from related Vigna species and to identify QTLs for pod length. The map was constructed from 226 simple sequence repeat (SSR) markers from cowpea (Vigna unguiculata (L.) Walp. subsp. unguiculata Unguiculata Group), azuki bean (Vigna angularis (Willd.) Ohwi & Ohashi), and mungbean (Vigna radiata (L.) Wilczek) in a BC1F1 ((JP81610 × TVnu457) × JP81610) population derived from the cross between yardlong bean accession JP81610 and wild cowpea (Vigna unguiculata subsp. unguiculata var. spontanea) accession TVnu457. The markers were clustered into 11 linkage groups (LGs) spanning 852.4 cM in total length with a mean distance between adjacent markers of 3.96 cM. All markers on LG11 showed segregation distortion towards the homozygous yardlong bean JP81610 genotype. The markers on LG11 were also distorted in the rice bean (Vigna umbellata (Thunb.) Ohwi & Ohashi) map, suggesting the presence of common segregation distortion factors in Vigna species on this LG. One major and six minor QTLs were identified for pod length variation between yardlong bean and wild cowpea. Using flanking markers, six of the seven QTLs were confirmed in an F2 population of JP81610 × TVnu457. The molecular linkage map developed and markers linked to pod length QTLs would be potentially useful for yardlong bean and cowpea breeding.

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Ogunkanmi, Adebayo, Oluwatoyin Ogundipe, Luky Omoigui, Adebola Odeseye, and Christian Fatokun. "Morphological and SSR marker characterization of wild and cultivated cowpeas (Vigna unguiculata L. Walp)." Journal of Agricultural Sciences, Belgrade 64, no. 4 (2019): 367–80. http://dx.doi.org/10.2298/jas1904367o.

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Three hundred and ninety accessions comprising 260 cultivated and 130 wild cowpea accessions were evaluated phenotypically using 27 cowpea descriptors. Morphological evaluation of some qualitative traits revealed 11.92% and 29.23% presence of pigmentation on the stem, 1.53% and 20.76% presence of stripes on the pod, and 0% and 20% presence of hairiness on the plant of cultivated and wild cowpeas respectively. As for the molecular analysis, sixteen SSR primers were employed for genotyping 48 accessions from both wild and cultivated cowpeas. The data generated a dendrogram with three clusters, two of which consisted of wild cowpea while the third cluster comprised all the cultivated cowpeas, including the yard-long-bean (Vigna unguiculata subsp. sesquipedalis) and Vigna unguiculata subsp. cylindrica accessions. Two wild accessions of subsp. dekindtiana, and one each of subsp. kgalagadensis and protracta clustered with cultivated cowpea indicating their relationships with cultivated cowpea, but not with other wild cowpeas. The numbers of polymorphic SSR bands in cultivated and wild cowpeas were 38 and 54, respectively, while the PIC values were 4.47 and 6.14, respectively, showing a greater genetic diversity in wild than in cultivated cowpeas. The subsp. dekindtiana had the highest number (80%) of shared SSR bands with cultivated cowpea followed by subsp. protracta with 54% of shared bands. Five species of wild cowpea have hairs and so could be used in breeding for resistance to insects.

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Ha, Tae Joung, Myoung-Hee Lee, Yu Na Jeong, Jin Hwan Lee, Sang-Ik Han, Chang-Hwan Park, Suk-Bok Pae, Chung-Dong Hwang, In-Youl Baek, and Keum-Yong Park. "Anthocyanins in cowpea [Vigna unguiculata (L.) Walp. ssp. unguiculata]." Food Science and Biotechnology 19, no. 3 (June 2010): 821–26. http://dx.doi.org/10.1007/s10068-010-0115-x.

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Ugale, PN, MP Wankhade, and JD Deshmukh. "Correlation studies in cowpea (Vigna unguiculata L.)." International Journal of Chemical Studies 8, no. 6 (November 1, 2020): 743–46. http://dx.doi.org/10.22271/chemi.2020.v8.i6k.10857.

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Vaillancourt, R. E., and N. F. Weeden. "Lack of isozyme similarity between Vigna unguiculata and other species of subgenus Vigna (Leguminosae)." Canadian Journal of Botany 71, no. 4 (April 1, 1993): 586–91. http://dx.doi.org/10.1139/b93-066.

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The cowpea (Vigna unguiculata (L.) Walp.) is an important crop of tropical Africa, Asia, and South America. However, the relationship between the cowpea and other species of subg. Vigna is relatively unknown. The objective of this study was to assess the genetic distance among species of subg. Vigna using isozymes. Twenty-four populations of the cowpea species and 39 populations from 10 other species (at least one species per section of subgenus Vigna) were sampled. Nei's genetic distance was calculated from allelic frequencies at 26 isozyme loci. UPGMA cluster analysis was performed. The range of genetic distance among species of subg. Vigna (0.41 – 2.69) was greater than previously reported in most plant genera. Three clusters of species were apparent. The first cluster included three species of sect. Vigna (V. luteola, V. oblongifolia, and V. subterranea (the Bambara groundnut)). The second cluster grouped together sections Liebrechtsia and Macrodontae. The third cluster included V. unguiculata, V. reticulata, and V. vexillata. The distances between species of this cluster were large and of similar size in all combinations (range from 0.92 to 0.95). None of the species included in this survey can be called a close relative of V. unguiculata. Key words: Vigna, cowpea, isozymes, genetic distances.

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Pal, A. K., B. Singh, and A. N. Maurya. "Inbreeding depression in cowpea (Vigna unguiculata (L.) Walp.)." Journal of Applied Horticulture 05, no. 02 (December 15, 2003): 105–7. http://dx.doi.org/10.37855/jah.2003.v05i02.25.

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CHANDRAKAR, RUPESH, ANNU VERMA, J. SINGH, and N. MEHTA. "Genetic divergence in vegetable cowpea (Vigna unguiculata L.)." ASIAN JOURNAL OF HORTICULTURE 11, no. 2 (December 15, 2016): 323–28. http://dx.doi.org/10.15740/has/tajh/11.2/323-328.

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Lonardi, Stefano, María Muñoz‐Amatriaín, Qihua Liang, Shengqiang Shu, Steve I. Wanamaker, Sassoum Lo, Jaakko Tanskanen, et al. "The genome of cowpea (Vigna unguiculata[L.] Walp.)." Plant Journal 98, no. 5 (May 28, 2019): 767–82. http://dx.doi.org/10.1111/tpj.14349.

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Badhe, P. L., D. M. Raut, N. M. Magar, D. N. Borole, and V. Y. Pawar. "Diallel analysis in Cowpea (Vigna unguiculata (L.)Walp.)." Electronic Journal of Plant Breeding 7, no. 2 (2016): 291. http://dx.doi.org/10.5958/0975-928x.2016.00037.5.

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Dissertations / Theses on the topic "Cowpea (vigna unguiculata (l.)"

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Ishiyaku, Mohammad Faguji. "Inheritance of time to flowering in cowpea [Vigna unguiculata (L.) Walp]." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360060.

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Omwenga, George Isanda. "Callus Development and Organogenesis in Cultured Explants of Cowpea (Vigna unguiculata (L.) Walp." Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4655/.

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Cowpea, Vigna unguiculata (L.) Walp is an excellent source of protein, vitamins and minerals and a major food crop many parts of Africa. Optimal production levels are hampered by insect pests and diseases. Biotechnological techniques such as tissue culture and genetic engineering can aid in the development of varieties with resistance to insect pests and diseases. The objective of this study was to investigate conditions necessary for the development of a reproducible tissue culture system that can be applied to regenerate transformed cells from culture. The in vitro manipulation of cowpea using Murashige and Skoog (MS) medium, auxins and cytokinins resulted in the formation of callus and rhizogenesis. Calli that were formed were separated into six classes based on color and texture. Yellowish friable callus, yellowish compact, soft yellowish callus and green and white were composed of largely vacuolated cells and were non-regenerative. Friable green callus was the most prevalent callus type and could form of roots in some hormone combinations. Green spots were formed on hard compact green callus. The green spots became nodular, forming root primordia and ultimately giving rise to roots. None of the six calli types gave rise to the formation of shoots. Embryogenic callus was induced from cowpea explants cultured on MS medium supplemented with dicamba and picloram. Embryogenic suspension cultures were initiated from callus induced on MS supplemented with 3.0 mg/L dicamba or picloram and conditions for maintenance of embryogenic suspension cultures were evaluated. Somatic embryos were formed in suspension cultures. Attempts to convert and germinate the somatic embryos resulted in the formation of callus or formation of appendages on the somatic embryos or in the death of the embryos. The appendages formed roots on prolonged culture. Further research is needed to determine appropriate optimal conditions for embryo conversion and germination and ultimately plant recovery from culture.

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Ngugi, Eliud Chege Kahiu. "The genetics of carbon isotope discrimination in cowpea (Vigna unguiculata L. Walp)." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239598.

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Marques, Marcelo Rodrigues. "Ação hipocolesterolêmica de hidrolisados de feijões caupi (Vigna unguiculata L. Walp)." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/6/6138/tde-09102013-152334/.

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Introdução - Devido ao perfil de mortalidade e de danos patológicos associados, as doenças cardiovasculares são consideradas um sério problema de saúde pública. Níveis de colesterol plasmático elevados fazem parte dos fatores de risco mais importantes para o desenvolvimento dessas doenças. Pesquisas recentes demostraram que a proteína do feijão caupi promove a redução dos níveis de colesterol em hamsters e em seres humanos, possivelmente pela ação de peptídeos bioativos advindos da dieta. Entretanto, a via pela qual o colesterol é inibido por esses peptídeos, assim como os efeitos do processamento na ação biológica ainda são desconhecidos. Objetivo - Verificar a via de ação hipocolesterolêmica dos hidrolisados do feijão caupi e o efeito do processamento térmico nesta propriedade. Métodos - Parte da farinha integral foi submetida ao isolamento de proteína e o restante dos grãos foi submetido à cocção em autoclave e à extrusão. Após ser cozido em autoclave, o feijão cozido também teve sua proteína isolada. Posteriormente, a proteína isolada do feijão integral e do feijão cozido foi submetida à hidrólise in vitro. O processo de extrusão foi modelado em função da expansão dos extrusados segundo a metodologia de superfície de resposta. A farinha do feijão extrusado foi submetida à hidrólise enzimática in vitro sem isolamento prévio da proteína. Os três hidrolisados foram submetidos à ultrafiltração e a fração menor que 3 kDa foi utilizada nos ensaios de inibição da enzima 3-hidroxi-3-metilglutaril coenzima A redutase (HMGR) e no ensaio de inibição da solubilização micelar do colesterol para avaliar a ação dos hidrolisados na via hepática e na via entérica do metabolismo do colesterol respectivamente. Resultados - Os hidrolisados provenientes dos isolados proteicos apresentaram comportamentos semelhantes. Em doses mais elevadas de proteína (acima de 70 µg/mL), a inibição apresentou-se estável, por volta dos 75 por cento. Em relação ao hidrolisado da farinha de feijão extrusado, à medida que se aumenta a quantidade de proteína a capacidade inibitória diminui. Os hidrolisados foram capazes de inibir a solubilização micelar do colesterol de 5 a 39 por cento. O processamento térmico foi fator determinante para diminuir a solubilização do colesterol in vitro. Conclusão Os hidrolisados do feijão caupi são capazes de inibir a enzima HMGR e reduzir a solubilização micelar do colesterol in vitro, mesmo após o feijão ser processado termicamente. A capacidade dos hidrolisados de insolubilizar o colesterol foi melhorada pelo cozimento em autoclave e pela extrusão
Introduction- The cardiovascular diseases, due to mortality and associated pathological damage, are considered a serious public health problem. Elevated plasma cholesterol levels are part of the most important risk factors for the development of these diseases. Recent research indicated that Cowpea protein promotes the reduction of cholesterol levels in hamsters and humans, possibly by the action of bioactive peptides from the diet. However, the route by which cholesterol is inhibited by peptides, as well as the processing effects on biological action are still unknown. Objective - To verify the hypocholesterolemic pathway of hydrolyzed cowpea and the effect of thermal processing on this property. Methods - Part of wholemeal flour was subjected to isolation of protein, and the remaining of the grains was subjected to retort and extrusion cooking processes. After autoclaving the grain, protein was also isolated from the flour. Subsequently, the isolated protein from wholemeal and cooked flour was subjected to in vitro hydrolysis. The extrusion process was optimized according to response surface methodology using the expansion ratio of extrudates as the dependent variable. The extruded bean flour was subjected to in vitro enzymatic hydrolysis without the isolation of the protein. The three hydrolysates were subjected to ultrafiltration and and fractions smaller than 3 kDa was used for inhibition assays of the enzyme 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGR) and for inhibition assay of micellar solubilization of cholesterol to evaluate their effect on the liver and enteral cholesterol metabolism respectively. Results - The hydrolysates from the protein isolates showed similar. At higher doses of protein (above 70 mg/mL), the inhibition was stable at around 75 per cent. Regarding the hydrolyzate of bean flour extruded as it increases the amount of protein inhibitory capacity decreases. The hydrolysates were able to inhibit the micellar solubilization of cholesterol between 5 and 39 per cent. The thermal processing was the determining factor to decrease the solubility of cholesterol in vitro. Conclusion The hydrolysates of cowpea are able to inhibit the enzyme HMGR micellar solubilization and reducing cholesterol in vitro, even after being thermally processed beans. The ability of hydrolysates insolubilize cholesterol was improved by cooking in an autoclave and by extrusion

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Mao, Jingqin. "Improved resistance to insects in maize (Zea mays L) and cowpea (Vigna unguiculata L)." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27152.

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A novel alteration in secondary metabolism of maize transformed with wheat oxalate oxidase gene (OXO) was determined using HPLC and microscopy. Phenolic concentration was significantly increased, but DIMBOA synthesis was down-regulated. The high levels of soluble phenolic acids, in particular free ferulic acid, most likely contributed to the insect resistance in the OXO maize. To facilitate future cowpea transformation with the OXO, a stable in vitro regeneration system was established in blackeye cowpea via shoot organogenesis. The optimal initiation medium comprised MS salts, B 5 vitamins, 2 mg 1-1 BAP, 3% sucrose and 0.8% agar at pH 5.8. The highest initiation frequency and shoot number were obtained from the shoot apices of 3-5 days old seedlings. For shoot elongation, 0.5-5.0 mg 1-1 GA3 was required. Rooting medium was MS salts supplemented with B5 vitamins, 3% sucrose and 0.8% agar.

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Neto, Manoel C., and Paul G. Bartels. "Dry Matter Partitioning of Cowpea (Vigna Unguiculata (L.) Walp.) Under Water Deficit Conditions." College of Agriculture, University of Arizona (Tucson, AZ), 1992. http://hdl.handle.net/10150/214526.

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Water Stress caused reduction of seed yield in cowpea plants by decreasing total biomass and photosynthesis. The source leaf, pod and seed water potential of stressed cowpea were lower than water potential in non-stressed plants. No differences in water potential and turgor were observed between pod walls and seed of cowpea plants. Partitioning of the total above ground dry matter was similar for both stressed and nonstressed cowpea plants. Photosynthetic rates of single leaves from cowpea were greater for nonstressed than stressed plants. The duration of seed growth of cowpea was not different between stressed and nonstressed plants; however, rate of seed growth at the end of seed filling period was greater in nonstressed plants. Seed growth rate of both stressed and nonstressed cowpea plants declined at about the same time photosynthesis of the source leaf declined. Leaf area index was greatest in nonstressed cowpea.

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Legesse, Nigussu. "Genotypic comparisons of imbibition in chickpea (Cicer arietinum L.) and cowpea (Vigna unguiculata (L.) Walp.)." Thesis, University of Aberdeen, 1991. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU546773.

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Examination of the imbibition characteristics of eighty chickpea genetic lines (53 Desi and 27 Kabuli types) and eleven cowpea cultivars revealed that in both species seeds with unpigmented testae imbibed more rapidly than the pigmented seeds. Rapid imbibition was associated with high solute leakage, indicative of possible imbibition damage. Further evidence of imbibition damage was revealed in cowpea where the rapidly imbibing unpigmented seeds had poor vital staining with tetrazolium chloride after 24h imbibition. In chickpea, all the genetic lines of white Kabuli seeds had similar rapid rates of imbibition. In contrast, the pigmented Desi genetic lines revealed a range of rates of water uptake although many imbibed more slowly than the Kabuli lines. The incidence of delayed imbibers, that is, seeds which failed to imbibe until after 8h in water, was the main reason for reduced rates of imbibition in Desi lines. The restriction to water uptake by the pigmented seeds was mainly influenced by the properties of the seed coat. In cowpea seeds, the permeability of the seed coat was the most important factor limiting water uptake whereas in chickpea the permeability of the seed coat as a whole and of the micropyle as well as the degree of adherence of the seed coat to the cotyledons were important in regulating the movement of water into the seed. Investigation of the rate of imbibition during the maturation of dwarf French bean, cowpea and chickpea seeds revealed that development of slow water uptake by coloured cultivars was clearly associated with the appearance of pigmentation. In chickpea, this also coincided with the development of the adherence of the seed coat to the cotyledons. In contrast, seeds from unpigmented cultivars imbibed rapidly at all stages of maturation. Examination of the seed coat anatomy of chickpea and cowpea indicated that the pigmented seeds tended to have shorter and narrower palisade cells and also shorter tracheid bars than the unpigmented seeds. Differences in water uptake by Kabuli and Desi seeds were not evident when seeds were stored at 100% relative humidity and 40^oC for days. All seeds deteriorated at a similar rate. However, the importance of initial seed quality in influencing deterioration during storage was emphasised by the rapid loss of germination of the Kabuli seeds in which germination and vital staining revealed poor initial quality.

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Chiulele, Rogerio Marcos. "Morphological and physiological responses of cowpea (Vigna unguiculata (L) Walp.) cultivars to induced water stress and phosphorus nutrition." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/49770.

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Thesis (MScAgric) -- University of Stellenbosch, 2003.
ENGLISH ABSTRACT: Cowpeas are produced under low and irregular rainfall in most of arid and semi-arid areas of sub-Saharan Africa. Growth and yield are therefore reduced due to the occurrence of water stress during the growing season. Knowledge of the responses and adaptive mechanisms of cowpeas to water stress may help to improve the management practices for these areas. Therefore, three glasshouse experiments were conducted at Welgevallen Experimental Farm of the University of Stellenbosch to test the responses of two cowpea cultivars to water stress. In the first experiment, physiological responses were used to identify those physiological parameters, which can be used to distinguish between drought tolerant and susceptible cowpea cultivars. In the second experiment, some of the identified physiological parameters together with some morphological growth responses, yield and grain protein content of the same two cowpea cultivars were used to identify which is the more tolerant cultivar. Tn the third experiment, the hypothesis that increased phosphorus supply may improve the tolerance of cowpea plants to water stress and their ability of recover from the stress was tested. The results showed that water stress affected water relations, morphological growth parameters, yield and grain protein content, but increasing P supply reduced the effect of water stress and promoted more rapid recovery after re-watering. Water relations were affected by water stress because it reduced relative water content, which resulted in reduced water potential and increased leaf diffusive resistance and proline accumulation. Morphological growth responses and yields were affected because water stress reduced the leaf area, which resulted in reduced biomass production and seed yield. Lower leaf area under water stress was the result of the reduced number of leaves and leaf expansion rate, but the number of leaves was the most important parameter. Reduced seed yield was due to reduced number of pods. The responses of the two cultivars tested were different. AB Wit, which performed better under well-watered conditions was more affected by water stress due to its larger leaf area that resulted in excessive water loss by transpiration. ACH14 was more drought tolerant than AB Wit due to a combination of a more rapid stomatal closure and proline accumulation, which induced osmotic adjustment, and which in tum helped to maintain higher water potentials. The increased P supply reduced the effect of the water stress. High-P level plants showed higher root growth, which resulted in more water uptake and larger leaf area during the water stress period, and after re-watering these plants recovered more rapidly. The more rapid recovery from stress was the result of enhanced root growth and leaf expansion rate and most probably due to increased water uptake. High-P level plants also showed more rapid leaf appearance and plant growth at earlier stages compared to the low-P level plants.
AFRIKAANSE OPSOMMING: Akkerbone word onder toestande van lae en wisselvallige reenval in baie ariede en semi-ariede gebiede van Afrika verbou. In hierdie gebiede word groei en produksie dikwels beperk deur water tekorte gedurende die groei seisoen. Kennis van reaksies en aanpassingsmeganismes van akkerbone teenoor water tekorte mag dus help om produksietegnieke in bogenoemde gebiede te verbeter. Om hierdie rede is drie glashuiseksperimente onder gekontroleerde toestande op die Welgevallen Proefplaas van die Universiteit van Stellenbosch uitgevoer. In die eerste eksperiment is fisiologiese reaksies van twee cultivars gebruik om eienskappe te identifiseer wat gebruik kan word om tussen droogteweerstandbiedende en droogte gevoelige cultivars te onderskei. In die tweede eksperiment is sommige van die geidentifiseerde eienskappe asook morfologiese groei, opbrengs en kwaliteitsreaksies van dieselfde twee cultivars gebruik om die meer droogte weerstandbiedende cultivar te identifiseer. In die derde eksperiment is die hipotese dat P-bemesting die droogteweerstandbiedendheid teen en herstelvermoe na droogte kan verbeter, getoets. Die resultate toon dat water tekorte beide plantwaterverhoudings, morfologiese eienskappe asook opbrengs en proteieninhoud beinvloed, maar dat hoe P-peile die invloed van water tekorte verminder en herstelverrnoe na die droogte verbeter. Plant-waterverhoudings is bemvloed omdat water tekorte relatiewe waterinhoud van plante verlaag wat aanleiding gee tot verlaagde plantwaterpotensiale, verhoogde huidmondjie weerstand en 'n toename in prolien inhoud. Morfologiese eienskappe en opbrengs is benadeel weens 'n veri aging in blaaroppervlakte wat fotosintetiese vermoe en gevolglik ook biomassaproduksie en saad opbrengs benadeel. Verlaagde blaaroppervlakte tydens water tekorte was hoofsaaklik die gevolg van 'n vermindering in aantal blare, terwyl verlaagde saadopbrengs grootliks die resultaat van 'n vermindering in aantal peule was. Die cultivar AB Wit wat die hoogste opbrengs onder gunstige groeitoestande gelewer het, is die meeste bemvloed deur water tekorte omdat die welige blaargroei van hierdie cultivar, luukse waterverbruik en groter transpirasie verliese veroorsaak het. Die cultivar ACH 14 daarteenoor het waterverliese beperk deurdat die huidmondjies vinniger gesluit het en verhoogde prolien-inhoude, osmotiese aanpassings veroorsaak het. Dit het gehelp om waterpotensiale instand te hou. Hierdie cultivar was gevolglik meer droogte weerstandbiedend as AB Wit. Hoe vlakke van P-bemesting het die effek van water tekorte verminder weens verbeterde wortelgroei. Dit het wateropname gedurende en na die peri ode van water stremming verbeter sodat plante vinniger herstel het na die droe periode. Plante wat by hoe P-peile gegroei is het ook 'n verhoogde blaarverskyningstempo en 'n toename in groei tydens die vroee ontwikkelingstadiums getoon.

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Masangwa, Johnny Isaac Gregorio. "The effect of plant extracts on anthracnose of Phaseolus vulgaris L. and Vigna unguiculata (L.) Walp." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/31458.

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Anthracnose is one of the serious diseases of cowpea (Vigna unguiculata L. Walp) and common bean (Phaseolus vulgaris L.) caused by the Colletotrichum fungi. The disease is prevalent is small holder farmers’ fields due to the scarcity and high cost of the synthetic fungicides. This study was conducted with the main aim of improving food security and income of the smallholder farmers by increasing legumes, P. vulgaris and V. unguiculata thereby increasing production and improve food security and income of smallholder farmers. Investigations involved in vitro bioassaying for antifungal activities of the crude extracts on Colletotrichum lindemuthianum (Sacc. and Magn.) Bri. and Cav. and Colletotrichum dematium (Fr.) Grove var. truncata field isolates and evaluating the effect of crude plant extracts seed treatments on seed germination, emergence and control of anthracnose disease of common bean and cowpea. Furthermore, ultra-structural changes of plant extracts treated and efficacy of foliar application of extracts. The in vitro study showed that Allium sativum L., Agapanthus caulescens Spreng., Carica papaya L. and Syzygium cordatum Hochst.ex Krauss extracts have good antifungal activities against both C. lindemuthianum and C. dematium. The low concentrations (5 mg.ml-1) of Syzygium and Agapanthus water extracts and acetone extracts of Agapanthus and Carica gave a high percentage of bean seed germination, emergence, short mean emergence time (MET) and were effective in controlling the anthracnose disease. The treatment of Agapanthus (both water and acetone) extracts also increased the shoot length and dry weight of the seedlings. The Allium acetone extracts (5 mg.ml-1) was the only treatment that gave good results with respect to germination percentages, MET, shoot length, leaf area and dry mass of cowpea. Five mg.ml-1 concentrations of Syzygium and Agapanthus water extracts and acetone extracts of Agapanthus and Carica have potential as seed treatments on bean. Allium acetone extract (5 mg.ml-1) was the only potential cowpea seed treatment that could be recommended to farmers as an alternative to the synthetic fungicide. Electron microscopy revealed that principle differences were observed in the cotyledon-embryo connecting tissues of seeds treated with Agapanthus, which had few cristae in their mitochondria than the cells from other treatments. The embryonic root cells of bean seeds treated with Agapanthus had coalescing protein bodies. The embryonic root cells of cowpea and bean treated with Syzygium had fewer lipid bodies as compared to the control and the Agapanthus treated seeds. Bean plants that were foliar treated with the 15 mg.ml-1 concentrations of Allium water, Agapanthus water, Carica water, Agapanthus acetone, Carica 5 and 15 mg.ml-1 acetone, Syzygium 5 mg.ml-1 acetone extracts and the combinations (2.5 mg.ml-1 + 2.5 mg.ml-1) of Allium + Agapanthus, Allium + Carica, Agapanthus + Syzygium and Carica + Syzygium extracts registered low anthracnose (C. lindemuthianum,) disease severity and high leaf area. The cowpea plants treated with 15 mg.ml-1 water extracts of Agapanthus and the combinations of Allium + Agapanthus, Agapanthus + Carica and Agapanthus + Syzygium extracts recorded low cowpea anthracnose (C. dematium) disease severity, highest leaf area and dry mass. The study revealed that A. sativum, Agapanthus, C. papaya and S. cordatum plant extracts have antifungal activities and can be used as alternative seed treatments and foliar fungicides against the anthracnose diseases of legumes (cowpea and common bean) instead of synthetic fungicides without causing any negative effect on seed germination, emergence, ultra-structure of seeds and plant growth. Copyright
Dissertation (MSc)--University of Pretoria, 2012.
Microbiology and Plant Pathology
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Thobatsi, Jacob Thobatsi. "Growth and yield responses of maize (Zea mays L.) and cowpea (Vigna unguiculata L.) in an intercropping system." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-10122009-184005.

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Books on the topic "Cowpea (vigna unguiculata (l.)"

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Magalhães, Iracema Costa. Cowpeas (Vigna unguiculata (L.) Walp): Abstracts of Brazilian literature, 1903-1987. Ibadan, Nigéria: International Grain Legume Imformation [sic] Centre, 1988.

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Saroj, Sardana, and National Bureau of Plant Genetic Resources (India), eds. Catalogue on cowpea (Vigna unguiculata (L.) walp.) germplasm. New Delhi: National Bureau of Plant Genetic Resources, 2000.

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Bashir, Muhammad. Serological and biological characterization of seed-borne isolates of blackeye cowpea mosaic and cowpea aphid-borne mosaic potyviruses in Vigna unguiculata (L.) Walp. 1992.

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Ryerson, Douglas Edward. A study of resistance to Uromyces vignae, race 1 (Barcl.) in cultivars of Vigna unguiculata (L.) Walp. 1998.

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Book chapters on the topic "Cowpea (vigna unguiculata (l.)"

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Behura, Ratikanta, Sanjeev Kumar, Bedabrata Saha, Manasa Kumar Panda, Mohitosh Dey, Ayan Sadhukhan, Sagarika Mishra, et al. "Cowpea [Vigna unguiculata (L.) Walp.]." In Methods in Molecular Biology, 255–64. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1695-5_20.

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Nwokolo, E., and S. N. Ilechukwu. "Cowpea (Vigna unguiculata (L.) Walp.)." In Food and Feed from Legumes and Oilseeds, 229–42. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0433-3_26.

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Boukar, Ousmane, Abou Togola, Siva Chamarthi, Nouhoun Belko, Haruki Ishikawa, Kanako Suzuki, and Christian Fatokun. "Cowpea [Vigna unguiculata (L.) Walp.] Breeding." In Advances in Plant Breeding Strategies: Legumes, 201–43. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23400-3_6.

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Horst, W. J., C. Currle, and A. H. Wissemeier. "Differences in calcium efficiency between cowpea (Vigna unguiculata (L.) Walp.) cultivars." In Genetic Aspects of Plant Mineral Nutrition, 59–68. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1650-3_8.

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Rajapakse, S., and J. C. Miller. "Intraspecific variability for VA mycorrhizal symbiosis in cowpea (Vigna unguiculata [L.] Walp.)." In Genetic Aspects of Plant Mineral Nutrition, 523–36. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3581-5_50.

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Brou, Y. C., M. Eyletters, and R. Lannoye. "Superoxide Dismutases Regulation in Cowpea (Vigna Unguiculata (L.) Walp.) Under Water Deficit Conditions." In Photosynthesis: Mechanisms and Effects, 1999–2002. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-3953-3_467.

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Thu, Pham Thi Anh, Sahsah Yamina, Roy-Macauley Harold, d’Arcy-Lameta Agnès, and Zuily-Fodil Yasmine. "Properties of a Purified Soluble MGDG-ACYL-Hydrolase from Cowpea (Vigna unguiculata L.) Leaves." In Plant Lipid Metabolism, 304–6. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8394-7_85.

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Reddy, B. Rajasekhar, K. Nagendran, B. Singh, P. M. Singh, J. Singh, and Maneesh Pandey. "Accelerated Breeding of Cowpea [Vigna unguiculata (L.) Walp.] for Improved Yield and Pest Resistance." In Accelerated Plant Breeding, Volume 2, 397–415. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47298-6_15.

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Gnanam, A., B. Muthukumar, Mariamma Mammen, and K. Veluthambi. "Genetic Transformation of Cowpea (Vigna Unguiculata L. Walp) by a. Tumefaciens Using Cotyledons as Explants." In Photosynthesis: from Light to Biosphere, 2647–50. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0173-5_624.

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Paula, Campos, and Pham Thi Anh Thu. "Effects of Drought Stress on Enzymatic Breakdown of Galactolipids in Cowpea (Vigna unguiculata L.) Leaves." In Plant Lipid Metabolism, 426–28. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8394-7_114.

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Conference papers on the topic "Cowpea (vigna unguiculata (l.)"

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Putri, Pratanti Haksiwi, and Novita Nugrahaeni. "Cowpea [Vigna unguiculata (L.) Walp.] Yield Variance and Supported Character." In 3rd KOBI Congress, International and National Conferences (KOBICINC 2020). Paris, France: Atlantis Press, 2021. http://dx.doi.org/10.2991/absr.k.210621.012.

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"Structural organization of TFL1-like genes of cowpea (Vigna unguiculata (L.) Walp.)." In SYSTEMS BIOLOGY AND BIOINFORMATICS (SBB-2020). Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences., 2020. http://dx.doi.org/10.18699/sbb-2020-18.

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"Genetic mechanisms associated with determinate growth habit in cowpea (Vigna unguiculata (L.) Walp.)." In SYSTEMS BIOLOGY AND BIOINFORMATICS. Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 2019. http://dx.doi.org/10.18699/sbb-2019-19.

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Lo, Sassoum. "Genetic and anatomical analysis of pod shattering in domesticated cowpea (Vigna unguiculata [L.] Walp)." In ASPB PLANT BIOLOGY 2020. USA: ASPB, 2020. http://dx.doi.org/10.46678/pb.20.1332318.

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Matei, Gheorghe. "COWPEA (VIGNA UNGUICULATA L. WALP) A VALUABLE CROP FOR DROUGHT AREAS WITH SANDY SOILS." In 15th International Multidisciplinary Scientific GeoConference SGEM2015. Stef92 Technology, 2015. http://dx.doi.org/10.5593/sgem2015/b61/s25.052.

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"Genetic Variability Studies of Some Quantitative Traits in Cowpea (Vigna Unguiculata L. [Walp.]) under Water Stress." In Nov. 19-20 2018 Cape Town (South Africa). Eminent Association of Pioneers, 2018. http://dx.doi.org/10.17758/eares4.eap1118103.

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"Genetic Variability Studies of Some Quantitative Traits in Cowpea (vigna unguiculata l. [walp.]) Under Water Stress." In Multi-Disciplinary Manila (Philippines) Conferences Jan. 23-24, 2017, Manila (Philippines). Universal Researchers (UAE), 2017. http://dx.doi.org/10.17758/uruae.ae0117603.

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Herniter, Ira. "Genetic, textual, and archaeological evidence of the historical global spread of cowpea (Vigna unguiculata [L.] Walp)." In ASPB PLANT BIOLOGY 2020. USA: ASPB, 2020. http://dx.doi.org/10.46678/pb.20.1052040.

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"Genetic variability studies of some quantitative traits in cowpea (vigna unguiculata l. [walp.] ) under water stress." In Budapest 2017 International Conferences. EAP, 2017. http://dx.doi.org/10.17758/eap.c0917032.

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Olajide, Amos Afolarin. "Estimates of genetic correlations of some important quantitative traits in cowpea,Vigna unguiculata(L.) Walp., under drought stress." In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.104894.

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