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Dissertations / Theses on the topic 'Resistant varieties'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Khalequzzaman, Mohammad. "Development of drought resistant varieties of rice (Oryza sativa L.) through in vitro hybridization." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288150.

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2

Ebong, Cyprian. "The nutritional effects of tannins and related polyphenols in bird resistant and non-bird resistant sorghum varieties and in legume browses." Thesis, University of Aberdeen, 1989. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU545401.

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Large amounts of cereal straws are produced in Africa every year. The straw is a potentially valuable source of energy for ruminant livestock. The quality of some straws, notably bird resistant sorghum varieties, are very low (Reed et al . 1987) and may need treatment prior to feeding to the animals. Since physical treatments are often expensive and technically unsuitable for small farming conditions, proven chemical methods could be employed wherever they are technically and economically feasible. Supplementation for deficient nutrients is an alternative approach to improve the utilisation of

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3

Aguiar, Elisabete Cristina Fonseca. "Study of rice varieties: chemical and nutritional facts." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/21566.

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Mestrado em Biotecnologia - Biotecnologia Alimentar<br>Este estágio curricular foi desenvolvido em parceria com a Novarroz – Produtos Alimentares, S.A., uma empresa familiar cuja atividade principal é o processamento e comercialização de arroz e dos seus subprodutos. O arroz (Oryza sativa) é uma das mais importantes culturas de cereais e é consumido por 60% da população mundial, sendo uma das principais fontes de nutrientes e energia. Desta forma, o conhecimento da composição das variedades de arroz é de total importância para a Novarroz, Produtos Alimentares, S.A. Assim, este trabalho englobo

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4

Vadnerkar, Anuya Anant. "Soluble fiber and resistant starch components in some Indian and Canadian wheat varieties and in a wheat-soy product - Chapati." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/10174.

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This study aimed to quantify resistant starch (RS) beta-glucans (BG) and fructo-oligosaccharides (FOS) in Indian and Canadian wheat varieties and in chapaties made from these; and to assess the effects of soy flour on the levels of these components and its effects on the sensory and functional properties of the wheat-soy chapaties. Seven wheat varieties (Indian / Canadian) were milled into flour; supplemented with 0 % (control), 10 %, 20 % or 30 % defatted soy flour and made into chapaties. Flours and chapaties (freeze-dried, pulverized) were assayed for BG, FOS, RS and simple sugars (glucose

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5

Marimo, Pricilla. "Gender Impacts of Molecular-Assisted Breeding: The Case of Insect and Disease Resistant Cassava in Nigeria." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/33537.

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Cassava is the main staple crop in Nigeria. Using primary data from four south eastern states in Nigeria, the study assessed the gender impacts of improved cassava varieties. Comparative statistical analysis reveals that total female labor is higher than total male in cassava production, processing and marketing. Women spend more labor days than males for planting, weeding, harvesting, marketing and processing. The total female family labor is higher for adopters of new improved cassava varieties. There is however lower family labor input for both male and female adopters for clearing and plow

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6

Yankey, Egya Ndede. "The lethal disease of coconut in Ghana : developing molecular markers and pathogen quantification techniques for the breeding of resistant or tolerant varieties." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/13953/.

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Lethal diseases (LD) of coconut caused by phytoplasmas have destroyed millions of palms globally and pose a serious threat to the coconut industry in Ghana. This study investigated the genetic basis of resistance/tolerance of coconut varieties and hybrids to LD. The study was also aimed at developing molecular markers for cultivar verification to be used for the sustainable breeding of high value varieties and hybrids. Using PCR diagnosis and monitoring of symptoms of LD over a three year period, the study determined that escapee palms of the West African Tall ecotype (WAT) found in LD-devasta

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7

Paiva, Ana Giselda Simões. "Genotypic and environmental effects on the concentration of healthy compounds of four durum wheat varieties." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15497.

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Mestrado em Biotecnologia - Biotecnologia Alimentar<br>Wheat is one of the most important grain in human diet and it is the most grown cereal crop wordwide. Nowadays since global climatic changes have become more important to food production, we asked whether climatic conditions and genotype would influence the production of healthy compounds on old and new varieties of durum wheat. Resistant starch and phenolic acids were quantified by HPLC techniques to evaluate the environmental and genotypic effects and to characterize four durum wheat species grown in South Italy. Environment had a strong

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8

Ottman, Michael J. "Nondormant Alfalfa Varieties for Arizona 2015." College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/576828.

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Revision of AZ1267<br>2 pp.<br>Alfalfa varieties differ in fall dormancy, defined as growth during the fall. Nondormant alfalfa varieties are usually planted in mild winter areas for their ability to grow in the late fall, winter, and early spring. Select alfalfa varieties that have resistance to potential pest problems. Alfalfa varieties are available that have salt tolerance or are Roundup Ready. Ratings are provided in this publication. Many of the varieties listed in this publication have been tested for yield and final stand by the University of Arizona in small plot trials.

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9

Ottman, Michael J. "Nondormant alfalfa varieties for Arizona 2016." College of Agriculture, University of Arizona (Tucson, AZ), 2016. http://hdl.handle.net/10150/625420.

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2 pp.<br>Alfalfa varieties differ in fall dormancy, defined as growth during the fall. Nondormant alfalfa varieties are usually planted in mild winter areas for their ability to grow in the late fall, winter, and early spring. Select alfalfa varieties that have resistance to potential pest problems. Alfalfa varieties are available that have salt tolerance or are Roundup Ready. Ratings are provided in this publication. Many of the varieties listed in this publication have been tested for yield and final stand by the University of Arizona in small plot trials. Revised 10/2016. Most recent versi

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10

Baqui, M. A. "Resistance of rice varieties to the brown planthopper Nilaparvata lugens (Stal)." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370875.

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11

Boylu, Baris. "Genetic Screening Of Turkish Wheat Varieties For The Durable Resistance Gene, Lr34." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613140/index.pdf.

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Wheat diseases such as rusts and powdery mildews are among the most important and ancient diseases that affect wheat cultivation worldwide. The pathogen race specific resistance genes cannot maintain long lasting resistance. On the other hand, the presence of genes confers the non-race specific resistance last much longer. The durable resistance phenotypes in wheat against various rust and powdery mildew diseases were reported as Lr34, Yr18, and Pm38 separately<br>nevertheless, they were known to locate very close to each other based on linkage analysis. Recently, it was shown that all of thes

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12

Odom, Jennifer Lorraine. "Evaluation of Field Pea Varieties for Resistance to Fusarium Root Rot Pathogens." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28500.

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Fusarium root rot is one of the most important diseases of pulse crops, with numerous Fusarium spp. comprising the disease complex. Fusarium solani and F. avenaceum have been reported to be major pathogens in the pea root rot complex, and all commonly grown varieties are susceptible. Greenhouse methods to evaluate peas for resistance to Fusarium root rot resulted in inconsistent disease severity across varieties. In 2015, F. avenaceum infested field plots were more heavily damaged based on emergence and yield than F. solani infested plots, and opposite trends were observed in 2016. Differences

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13

Bancarzewski, Maciej Albert. "Japanese foreign direct investment : varieties of capitalism, employment practices and worker resistance in Poland." Thesis, University of Hertfordshire, 2015. http://hdl.handle.net/2299/17112.

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This research contributes to an understanding of Japanese Foreign Investment (JFDI) in Poland, by using a Variety of Capitalism approach and drawing on literature from employment relations. It examines firstly, the extent to which Japanese production and managerial institutions and practices can be transplanted to different economic and cultural environments; and secondly, the character of workers' response towards these practices, in the context of JFDI in Poland. It draws on primary data drawn from interviews conducted with the managers and workers in five firms in a Japanese electronics man

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14

Kalorizou, Helen. "Physiological and anatomical approaches for identifying resistance mechanisms to migratory endoparasitic nematodes among Musa varieties." Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288747.

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15

Clark, Lee J., Richard B. Hine, and Eddie W. Carpenter. "Resistance to Verticillium Wilt by Eight Varieties of Short Staple Cotton, Safford Agricultural Center, 1987." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/204547.

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Eight short staple varieties were evaluated for severity of symptoms, percent of plants infected and yield while being grown in a Verticillium nursery on the Safford Agricultural Center. Delta Pine 90 showed the least severe symptoms, had the least number of infected plants and also yielded the highest. Another Delta Pine variety, DP 77, showed moderate symptoms and a 96% infection rate, but it still managed to come in third in yield, only 49 pounds per acre behind DP 90. Yield potential and varietal adaptability must be considered along with Verticillium wilt resistance in deciding what varie

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16

Ben, Salem Moncef. "Etude comparative de la resistance a la secheresse de quelques varietes de ble." Paris 7, 1988. http://www.theses.fr/1988PA077012.

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On montre que la resistance du ble a la contrainte hydrique est associee au maintien d'un nombre d'epis fertiles et d'un nombre de grains par epi eleves, a une petite taille du grain et a une capacite de recuperation elevee. On a evalue les besoins globaus optima en eau a 440 mm et on a montre qu'une mauvaise efficacite de l'utilisation de l'eau peut etre la consequence d'un developpement foliaire surdimensionne. Une production en grains stable en cas de carence hydrique est liee a une photosynthese globale elevee, a de grandes capacites d'accumulation et de mobilisation der reserves glucidiqu

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17

Parada, André Luís Duarte. "Caracterização da resistência a Colletotrichum kahawae em Coffea spp." Master's thesis, ISA/UTL, 2011. http://hdl.handle.net/10400.5/4051.

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Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia<br>Coffee is one of the most valuable agricultural products in world trade being crucial to the economies of many developing countries. However its production is constrained by a number of major diseases, including Coffee Berry Disease (CBD) caused by Colletotrichum kahawae Waller & Bridge. Currently CBD is limited to Africa, constituting a serious threat to other coffee growing countries in other continents. This disease is responsible for up to 80% of crop losses, if no control measures are applied. The most widely used met

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18

Nguyen, Duc Bach, Van Hai Tong, Van Hung Nguyen, and Huu Ton Phan. "Collection, conservation, exploitation and development of rice genetic resource of Vietnam." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-190749.

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Genetic resources are important for the development of every country and for humanity. Collection, conservation and reasonable utilization of genetic resource is required mission. Understanding the importance of genetic resource, especially rice germplasm, since 2001, Center for conservation and development of crop genetic resources (CCD-CGR) of Hanoi University of Agriculture (Vietnam National University of Agriculture) has been collected, conserved and evaluated rice germplasm from different provinces of Vietnam for breeding programs. So far, 1090 accessions of local rice of Vietnam have bee

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19

Nguyen, Duc Bach, Van Hai Tong, Van Hung Nguyen, and Huu Ton Phan. "Collection, conservation, exploitation and development of rice genetic resource of Vietnam: Short communication." Technische Universität Dresden, 2014. https://tud.qucosa.de/id/qucosa%3A29104.

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Genetic resources are important for the development of every country and for humanity. Collection, conservation and reasonable utilization of genetic resource is required mission. Understanding the importance of genetic resource, especially rice germplasm, since 2001, Center for conservation and development of crop genetic resources (CCD-CGR) of Hanoi University of Agriculture (Vietnam National University of Agriculture) has been collected, conserved and evaluated rice germplasm from different provinces of Vietnam for breeding programs. So far, 1090 accessions of local rice of Vietnam have bee

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20

BENSAOUD, ABDELKADER. "Reponses physiologiques et agronomiques du colza (brassica napus l. ) au deficit hydrique : screening de varietes resistantes a la secheresse." Rennes 1, 1990. http://www.theses.fr/1990REN10118.

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Trois varietes de colza (brassica napus l. ) ont ete soumises a des contraintes hydriques d'origines differentes. Lorsque la contrainte est provoquee par addition simultanee de mannitol et nacl, la limite de tolerance du colza appreciee par le taux de germination est fixee a un potentiel du milieu de 1,5 mpa. Pour une contrainte provoquee par un arret d'irrigation, les plantes agees de 40 jours, se fanent irreversiblement pour un potentiel hydrique du sol voisin de 2,0 mpa. Pour une contrainte osmotique moderee (1,0 mpa) ou une secheresse edaphique progressive, les 3 varietes expriment des rep

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21

Robert, Olivier. "Etude et marquage moleculaire de genes de resistance a la rouille jaune du ble presents chez des varietes issues de vpm." Rennes, Agrocampus Ouest, 1998. http://www.theses.fr/1998NSARC048.

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La rouille jaune est une maladie du ble qui apparait sous la forme de pustules jaunes sur les feuilles. Elle est provoquee par le champignon biotrophe puccinia stniformis. Ce parasite peut engendrer des pertes allant jusqu'a 40 q/ha. Afin de lutter efficacement contre ce parasite, l'agriculteur peut traiter ses cultures avec des triazoles. Mais s'il cherche a restreindre le cout des intrants et diminuer les risques de pollution, il devra cultiver des varietes de ble offrant un bon niveau de resistance a ce pathogene. Pour ce faire, de nombreuses varietes presentant un bon niveau de resistance

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22

Rivoal, Roger. "Recherches sur le nematode heterodera avenae woll. , en relation avec la resistance des varietes de cereales e leur utilisation au champ." Rennes 1, 1987. http://www.theses.fr/1987REN10138.

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Il existe un polytypisme des populations francaises d'h. Avenae: l'ecotype (decalage du cycle d'eclosion) et 4 pathotypes (virulence sur orge et avoine). Les ecotypes possedent des conditions thermiques specifiques d'induction et de levee de diapause, operant chez de 2**(e) stade enkystees. Pas de distinction morphologique ou par polymorphisme enzymatique des pathotypes, mais interfeconds. Discussion des processus de coevolution et strategie adaptative. Lignees d'addition ble x aegilops ventricosa plus ou moins resistantes selon nombre de chromosomes m**(v) et pathotype. Evaluation en champ de

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23

Tinjuangjun, Porntip. "Transfer of pest and disease resistance genes to varieties of Thai rice (Oryza sativa L.) : enhancing transformation efficiency using a novel bombardment and selection system." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323239.

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24

Jönsson, Åsa. "Organic apple production in Sweden : cultivation and cultivars /." Alnarp : Department of Crop Science, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200714.pdf.

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25

Öhberg, Helena. "Studies of the persistence of red clover cultivars in Sweden : with particular reference to Sclerotinia trifoliorum /." Umeå : Dept. of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200808.pdf.

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26

Quilis, Blasi Jordi. "Expressió simultània de gens de defensa per a la producció de varietats d'arròs resistents a patògens i insectes plaga." Doctoral thesis, Universitat Autònoma de Barcelona, 2007. http://hdl.handle.net/10803/3580.

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Aquest treball s'emmarca dins d'una de les principals línees d'investigació del nostre grup, dirigida a l'avaluació d'estratègies aplicables a l'obtenció de varietats d'arròs resistents a patògens i insectes plaga mitjançant transformació genètica. L'objectiu general ha estat l'expressió simultània de gens vegetals que codifiquen proteïnes insecticides i antifúngiques en plantes d'arròs transgèniques. En primer lloc s'ha avaluat l'eficàcia de l'expressió d'un gen fusió que codifica dos inhibidors de proteases, els gens mpi de blat de moro (maize proteinase inhibitor) i pci de patata (potato ca

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27

Florez, Paxi Andrez Faustino. "Resistance of different tomato varieties (Lycopersicon esculentum) to late blight (Phytophthora infestans) in laboratory conditions at UAC Carmen Pampa, in the province of Nor Yungas, department of La Paz." BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/5365.

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In order to respond to the low economic and harvesting yields caused by diseases that attack the tomato, we considered using tomato varieties resistant to late blight (Phytophthora infestans) of tomato (Lycopersicon esculentum) and potato (Solanum tuberosum). The evaluation of the percentage of infestation was performed with tomato leaflets over a 168 hour period. The percentage of infestation was recorded every eight hours from the time of inoculation until maximum infestation was reached. The methodology applied was at random and included six treatments and five replications. The experiment

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28

Quirino, Mariana Senna. "Polimorfismos de seqüência nucleotídica em fragmentos genômicos de cana-de-açúcar homólogos a genes de resistência." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-14072003-102304/.

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Este trabalho objetivou investigar a existência de polimorfismos de seqüência nucleotídica (SNPs "single nucleotide polymorphisms") em fragmentos genômicos de cana-de-açúcar homólogos a genes de resistência. Para tal, iniciadores sintéticos homólogos às extremidades de uma seqüência expressa identificada (ESTs "expressed sequence tag") como homóloga ao gene Xa1 de arroz (EST SCCCCL3080E03.g) e outra ao gene Rp1-D de milho (EST SCCCCL3080B03.g) foram utilizados para amplificar, em duplicata, fragmentos genômicos de variedades de cana-de-açúcar. Em seguida, os fragmentos foram clonados e

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29

Pérez, Lotz Jorge. "Análisis genético de la resistencia parcial a Magnaporthe oryzae en arroz (Oryza sativa) en varias poblaciones y ambientes." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/62582.

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[EN] Rice (Oryza sativa L) is the main staple food for over 3 billion people (almost half the world population), and rice blast, caused by the fungus Magnaporthe oryzae, is the major threat for this crop worldwide, triggering also important losses in Spain some years. Some resistant cultivars have been released, mainly with complete resistance genes (Pi genes), but their resistance has not lasted long, due to the emergence of new virulent isolates. Therefore, the efforts for obtaining effective and durable resistance are focused nowadays on the use of partial resistance or a combination of par

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30

Susheelamma, B. N. "Evaluation and evolution of drought resistant mulberry varieties for sericulture." Thesis, 1987. http://hdl.handle.net/2009/2877.

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31

Cai, Zheng He, and 蔡政和. "Studies on the formation and physicochemical properties of enzyme-resistant starch from different rice varieties." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/21878034279666739738.

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32

Nesselhauf, Lucas. "Wine and innovation - Consumer acceptance of new grape varieties and wine packaging." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E51E-C.

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33

Ndou, Vuledzani Nico. "Chemical mutagenesis of wheat for herbicide resistance." Thesis, 2012. http://hdl.handle.net/10413/10040.

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Weed infestation is one of the yield limiting factors in crop production. Weeds have negative effect on crop growth and productivity due to competition, allelopathy or hosting other harmful organisms. For large-scale wheat production, the use of wide spectrum pre-emergence or post-emergence herbicides remains the most valuable weed control tool. In South Africa, annual grass weeds are a major wheat production constraint, which is usually managed through application of pre-emergence herbicides. Due to limited water availability and low soil moisture content, these herbicides can often become in

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Gichuru, Lilian Njeri. "Breeding investigations on utility of maize streak virus resistant germplasm for hybrid development in the tropics." Thesis, 2014. http://hdl.handle.net/10413/10694.

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Maize (Zea mays L.) supports millions of livelihoods in sub-Saharan Africa (SSA) in terms of food and feed. Production of the crop is however limited by several factors, among these, maize streak virus (MSV) disease. Although extensively studied, MSV remains a serious problem in SSA due to several challenges in breeding MSV resistant maize varieties. These include integration of MSV resistant germplasm from different backgrounds, reliance on a few resistant sources, and genotype x environment interactions. This study was designed to assess the breeding potential of several MSV resistant

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35

McFarlane, Sharon Anne. "Evaluation of sugarcane varieties for resistance to ratoon stunting disease." Thesis, 2003. http://hdl.handle.net/10413/4293.

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Ratoon stunting disease (RSD), caused by the bacterium Leifsonia xyli subsp xyli, is well established in most sugarcane growing regions of the world and is considered to cause more yield losses worldwide than any other sugarcane disease (Hughes, 1974). In South Africa, field trials have demonstrated that yield reductions under rainfed conditions can exceed 40% in highly susceptible varieties (Bailey and Bechet, 1986). When cane is grown under irrigation, yield losses are less noticeable but still significant in many varieties (Bailey and Bechet, 1995). It is estimated that RSD currently result

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Chen, Yi-Chia, and 陳儀嘉. "Development of Kaohsiung 145 multiline rice varieties for blast resistance." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5h7zpx.

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碩士<br>國立臺灣大學<br>植物病理與微生物學研究所<br>107<br>Rice blast can cause serious yield loss in rice production. Due to rapid evolution of Magnaporthe oryzae population, rice resistance to blast is generally easy to be overcome. To effectively control the disease, it is important to keep developing resistant varieties. As part of the ongoing effort in our lab, this study continues to introgress resistance genes from 11 IRBLs into Kaohsiung 145 through marker-assisted backcrossing. The individuals were screened for R genes by previously designed primers and new primers developed based on tetra-primer amplifi

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Audilakshmi, S. "Genetics of grain-mould resistance and yield components in sorghum (Sorghum bicolor) varieties." Thesis, 1997. http://oar.icrisat.org/702/1/62382.pdf.

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Sorghum ( Sorghum bicolor (L.) Moench) is a staple food crop in the semi-arid tropical areas of Africa and India. It is also an important feed and forage crop in other parts of the world. In India, the development of short-duration and shortstatured sorghum hybrids resulted in a quantum jcrmp in productivity from 560 kg ha" in 1970 to 1020 kg ha" in 1996. However, yield potentials of sorghum hybrids are not fully realized as they are highly susceptible to grain moulds, which not only cause yield loss but also reduce grain quality and market value. For any effective kharif hybrid breedin

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Chang, Che-Fu, and 張哲輔. "Development of new varieties with bacterial blight resistance genes by using marker-assisted selection." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/34489374965717718919.

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39

Chen, Wei-Lun, and 陳韋綸. "Development of a molecular marker platform for the breeding of rice blast resistance multiline varieties." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/75970750954455314520.

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碩士<br>國立臺灣大學<br>植物病理與微生物學研究所<br>104<br>Rice blast, caused by Magnaporthe oryzae, is the most important disease commonly occurring in the first crop season in Taiwan. This disease can cause considerable damage in every rice-producing areas. Use of blast resistant varieties is an effective and environmental-friendly method for blast control. The emerging marker-assisted selection (MAS) approach, which can significantly reduce the time needed for the development of new resistant varieties, has become a new trend in rice resistance breeding. In Taiwan, most high-quality rice varieties are with goo

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40

Mabulwana, Paseka Tritieth. "Determination of drought stress tolerance among soybean varieties using morphological and physiological markers." Thesis, 2013. http://hdl.handle.net/10386/1041.

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Thesis (M.Sc. (Botany))-- University of Limpopo, 2013<br>The aim of the study was to identify drought tolerant South African soybean cultivars for cultivation where water is a limited resource. Soybean [Glycine max. (L.) Merr] is one of the most important legumes in the world. A lot of attention has been focused on soybean cultivation in South Africa recently. Soybean production is mainly affected by several biotic and abiotic factors which reduce the yield and quality of the crop. Six South African soybean cultivars (LS 677, LS 678, Mopanie, Sonop, Knap and Pan 1564) and two American c

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41

Sampaio, Ana Margarida Novais de. "Introducing resistance genes against ToMV, TYLCV and TSWV infections in two tomato varieties (Muchamiel and De la Pera)." Master's thesis, 2015. http://hdl.handle.net/1822/39714.

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Dissertação de mestrado em Biologia Molecular, Biotecnologia e Bioempreendedorismo em Plantas<br>Muchamiel and De la Pera are two tomato traditional varieties very appreciated in Spain due to its organoleptic traits and quality, however these varieties are highly susceptible to several viruses as Tomato mosaic virus (ToMV), Tomato yellow leaf curl virus (TYLCV) and Tomato spotted wilt virus (TSWV) leading to huge production losses. In an attempt to increase plant resistance to these viruses the introduction of the virus resistance genes by introgression was tested by other investigation g

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Encinas-Mungarro, Andres. "Assessment of genetic resistance to strawbreaker foot-rot (Pseudocercosporella Herpotrichoides) in selected winter wheat (Triticum aestivum L.) cultivars." Thesis, 1991. http://hdl.handle.net/1957/36327.

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Strawbreaker foot-rot is a major limiting factor to cost efficient winter wheat production in the Pacific Northwest. Development of resistant cultivars has been hindered by the lack of adequate levels of genetic resistance and screening techniques which can consistently detect desired genotypes. Studies were conducted to determine if the reported strawbreaker foot-rot resistance of the cultivar "Rendezvous" is effective on isolates of Pseudocercosporella herpotrichoides found in the Pacific Northwest. Protected, naturally infected and artificially inoculated treatments were employed to determi

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Mabulu, Linda Yolanda. "Antixenosis and antibiosis as resistance mechanisms of South African sugarcane varieties against early instar larvae of Eldana saccharina Walker (Lepidoptera: Pyralidae)." Thesis, 2002. http://hdl.handle.net/10413/10222.

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The complexity of the behaviour of neonate Eldana saccharina Walker (Lepidoptera: Pyralidae) larvae and the limited information on their response to the morphological characteristics of South African sugarcane varieties was the primary justification to study antixenotic/antibiotic effects on larval behaviour. Laboratory experiments were conducted with stalk segments in plastic jars inoculated with larvae and in a metal cage covered with gauze. In jars, the larvae were observed until they penetrated the stalks. After 14 days, the stalks were dissected and larvae weighed. In all varieties, larva

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Lafta, Abbas Mubadar. "Some post-harvest physiological studies of potatoes and relation of some potato cultivars to incidence of internal brown spot." 1985. http://hdl.handle.net/2097/27479.

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Kasozi, Lwanga Charles. "Genetic analysis and selection for maize weevil resistance in maize." Thesis, 2013. http://hdl.handle.net/10413/10746.

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The maize weevil (Sitophilus zeamais Motschulsky) is one of the most destructive storage insect pest of maize (Zea mays L.) in tropical Africa and worldwide, especially when susceptible varieties are grown. Therefore, grain resistance against the maize weevil should be part of a major component of an integrated maize weevil management strategy. The specific objectives of this study were to: i) determine farmers’ perceptions about weevil resistance in maize cultivars; ii) determine the genotypic variation for maize weevil resistance in eastern and southern Africa maize germplasm lines; iii) stu

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Mafu, Nothando Fowiza. "Marker-assisted selection for maize streak virus resistance and concomitant conventional selection for Downy Mildew resistance in a maize population." Thesis, 2013. http://hdl.handle.net/10413/10023.

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Maize streak virus (MSV) disease, transmitted by leafhoppers (Cicadulina mbila, Naude), and maize downy mildew (DM) disease caused by Peronosclerospora sorghi (Weston and Uppal) Shaw, are major contributing factors to low maize yields in Africa. These two diseases threaten maize production in Mozambique, thus the importance of breeding Mozambican maize varieties that carry resistance to these diseases. Marker-assisted selection (MAS) was employed to pyramid MSV and DM disease resistant genes into a single genetic background through simultaneous selection. Firstly, it was essential to determine

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Sawasdee, Anuchart, and 康久安. "Screening and characterization of brittle mutants from the mutation pools of TNG67 and IR64 rice varieties and breeding to improve bacterial blight resistance." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/16932775598717804479.

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碩士<br>國立中興大學<br>農藝學系所<br>105<br>Straw is a by-product of rice after harvest, it is majorly consisted of lignocelluloses and is difficult to be degraded in the soil. The brittle culm mutants have mutation related with decreased secondary cell wall thickness and maybe easier for degradation. IR64 and TNG67 mutation pools were developed by sodium azide in our previous breeding programs. There were 21 and 23 brittle mutant lines selected from IR64 and TNG67 mutant pools. The brittle lines have differences in brittleness score from 0 to 5. IRB3 is a brittle culm mutant of IR64, it showed a Score 3

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Owere, Lawrence. "Genetic studies on head architecture, adaptation and blast resistance of finger millet in Uganda." Thesis, 2013. http://hdl.handle.net/10413/10917.

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Finger millet is the second most important cereal in Uganda after maize. The yields however, have remained low due to several constraints, such as finger millet blast disease and limited technology options. Therefore breeding investigations were conducted to determine farmer preferred traits, genetic variation, combining ability and genetic effects for head blast disease and head shapes, and other quantitative traits in finger millet. Among other traits, farmers preferred high grain yield potential, brown seed colour, compact head shape, tolerance to blast disease, high tillering ability, medi

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Robert, Olupot John. "Genetic analysis of Striga hermonthica resistance in Sorghum (Sorghum bicolor) genotypes in Eastern Uganda." Thesis, 2011. http://hdl.handle.net/10413/9981.

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Sorghum (Sorghum bicolor) is the third most important cereal food crop in Uganda. However, the parasitic weed Striga hermonthica severely constraints its production. The use of Striga resistant sorghum varieties may be one of the most feasible ways of managing the Striga problem. A series of studies were carried out with the overall objective to develop new sorghum genotypes that are resistant to Striga and high yielding in Eastern Uganda. Initially, a participatory rural appraisal (PRA) was carried out with the main objectives to study the current constraints faced by farmers in sorghum produ

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Mwimali, Murenga Geoffrey. "Genetic analysis and response to selection for resistance to two stem borers, Busseola fusca and Chilo partellus, in tropical maize germplasm." Thesis, 2014. http://hdl.handle.net/10413/10943.

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Maize is the principal staple food in sub-Saharan Africa (SSA), but production lags behind population growth. The African stem borer, Busseola fusca, Fuller (Lepidoptera, Noctuidae), and the spotted stem borer, Chilo partellus, Swinhoe (Lepidoptera, Crambidae) are serious insect pests of maize in tropical environments. The damage can be managed by breeding stem borer resistant maize varieties but there is limited information that can be used to devise appropriate breeding programs. Therefore breeding investigations were conducted to appraise germplasm screening methods, and to determine combin

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