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Dissertations / Theses on the topic 'Crops – Drought tolerance'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Sadaqat, Hafeez Ahmad. "Genetic and physiolgical basis of drought tolerance in oilseed brassicas." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367179.

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2

Stark, Jennifer Grace. "The establishment, drought tolerance, and weed suppression potential of multispecies sod." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/stark/StarkJ0509.pdf.

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Re-seeding is a frequently used technique to revegetate disturbed areas, but often leaves bare ground prone to weed invasion. Mixtures of drought tolerant or native species in sod could be used as an alternative to seed to provide rapid establishment of desirable plant communities that may potentially reduce weed emergence, survival, and productivity. Additionally, the reinforcement material required to aid transport of multispecies sod could further contribute to weed suppression and sod establishment. The objective of this study was to evaluate the weed suppression and establishment potentia

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3

Nasser, Mansour Mohamed. "Heritability and morpho-physiology of drought tolerance in lines of Middle Eastern wheat." Thesis, Bangor University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327347.

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4

Flores, Galdámez Servin Ardany. "Evaluation of forty-two corn (Zea mays L.) genotypes and their tolerance to drought in Chiquimula." BYU ScholarsArchive, 2000. https://scholarsarchive.byu.edu/etd/5362.

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The Corral de Piedra community is located in Chiquimula, Guatemala. The main agricultural activities are corn and bean production, small-scale gardens, and small animal production, such as poultry and pigs. The crop areas are predominantly located on lands with slopes between 12 and 55%, presenting low fertility conditions and poor moisture retention capabilities. In addition, local crop varieties have low productivity potentials and the winter season is characterized by poorly distributed and erratic periods of rain. The Benson Institute introduced a technology transfer model to increase and

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5

Pfunde, Cleopatra Nyaradzo. "Parent characterization of quality protein maize (Zea mays L.) and combining ability for tolerance to drought stress." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1007536.

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Quality protein maize (QPM) has enhanced levels of two essential amino acids, lysine and tryptophan compared to normal maize. This makes QPM an important cereal crop in communities where maize is a staple crop. The main abiotic factor to QPM production is drought stress. Little information is available on the effect of drought stress on QPM. Therefore, the objectives of this study were to: (i) conduct diversity analysis of QPM inbred lines using morpho-agronomic and simple sequence repeat markers, (ii) screen available QPM inbred lines and F1 progeny for tolerance to seedling drought stress, (

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6

Johnson, Stephanie. "The mechanisms of drought stress tolerance in the crop Sorghum bicolor." Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11426/.

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Drought stress can have a major impact upon plant survival and crop productivity. Sorghum bicolor is an important cereal crop grown in the arid and semi-arid regions of >98 different countries. It is well adapted to the harsh drought-prone environments in which it is grown however; relatively few studies have investigated the molecular basis of these adaptations. Breeding programs have lead to the identification of ‘stay-green’ varieties, so-called due to their ability to maintain green photosynthetic leaf area for longer under drought conditions. However, despite extensive breeding efforts to

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7

Mutava, Raymond Ngao. "Evaluation of sorghum genotypes for variation in canopy temperature and drought tolerance." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/14506.

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Doctor of Philosophy<br>Department of Agronomy<br>P.V. Vara Prasad<br>Sorghum (Sorghum bicolor L. Moench) is the fifth most economically important cereal crop grown worldwide and adapted to a wide range of climatic conditions. Drought stress has been ranked as one of the most significant causes of crop yield loss with its effects on yield and yield components. Conservative water use by plants is one of the strategies that can be used as a drought coping mechanism. The slow wilting trait has been associated with conservative water use and has been found in some sorghum genotypes. The purpose o

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8

Gokcay, Derya. "Physiological And Biochemical Screening Of Different Turkish Lentil (lens Culinaris M.) Cultivars Under Drought Stress Condition." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615008/index.pdf.

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Legumes being the most important crops worldwide are limited in terms of adaptability and productivity mainly by the abiotic stresses. In this study, the aim was to understand tolerance mechanisms of lentil cultivars under drought stress by physiological and biochemical analyses. This study was carried out with six Turkish Lentil cultivars (Seyran, Kafkas, Malazgirt, &Ccedil<br>agil, &Ccedil<br>ift&ccedil<br>i, &Ouml<br>zbek) subjected to drought stresses (10% and 15% PEG) and their physiological and biochemical properties were examined to select drought-tolerant and drought-sensitive cultivar

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9

Kottmann, Lorenz Verfasser], and Andreas [Akademischer Betreuer] [Fangmeier. "Rye (Secale cereale L.) : agronomic performance under drought and methods of crop physiology to determine the drought tolerance of winter rye / Lorenz Kottmann. Betreuer: Andreas Fangmeier." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2015. http://d-nb.info/1072463466/34.

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10

Guretzki, Sebastian [Verfasser]. "Development of plant species and ecotypes tolerant to drought stress as crop plants / Sebastian Guretzki." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2014. http://d-nb.info/1053414587/34.

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11

Schwarz, Julia A. [Verfasser], and Jürgen [Akademischer Betreuer] Bauhus. "Can thinning of conifer stands increase drought tolerance of crop trees? = Kann die Trockenheitstoleranz von Zukunftsbäumen durch Standraumerweiterung erhöht werden?" Freiburg : Universität, 2014. http://d-nb.info/1123480109/34.

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12

Meyer, Matthias. "Trockenheitsreaktionen und holzanatomische Eigenschaften der Zitter-Pappel (Populus tremula L.) – Physiologie und QTL-Mapping." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-38142.

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Holz aus Kurzumtriebsplantagen (KUP) mit Pappeln (Populus spp.) kann eine bedeutende Rolle im Mix der Bioenergieressourcen in Deutschland spielen. Trotz eines günstigen Energieinput-Energieoutput-Verhältnisses ist das Erreichen wirtschaftlich zufriedenstellender Ergebnisse mit KUP jedoch auf den meisten potenziellen Anbauflächen durch hohe Ansprüche der Pappeln an die Wasserversorgung erschwert. Hohe Produktivitätsraten der Pappeln sind an einen hohen Wasserverbrauch gebunden und viele Trockenheitsanpassungen führen zu deutlichen Ertragsrückgängen. In der vorgestellten Arbeit wurde eine sechsj

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13

Mangena, Phetole. "Oryza cystatin 1 based genetic transformation in soybean for drought tolerance." Thesis, 2015. http://hdl.handle.net/10386/1384.

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Thesis (MSc. (Botany)) -- University of Limpopo, 2015<br>Soybean is an important source of high quality protein and oil for both humans and animals, especially in protein formulations for pharmaceutical and nutriceutical use. This crop is adversely affected by both biotic and abiotic stresses impacting on its productivity. Soybean productivity can be improved via techniques such Agrobacterium-mediated genetic transformation. Soybean is recalcitrant and depends on suitable explants from which new shoots can be regenerated and be amenable for transformation. The goal of this study was to produce

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14

Macleod, Kyle. "The effect of Pseudomonas koreensis on the level of drought tolerance of Helianthus annuus." Thesis, 2016. http://hdl.handle.net/10539/21700.

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A Dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science. November 2016, Johannesburg.<br>Drought stress is one of the major limitations to crop production worldwide and has been predicted to become more severe in the future due to global climate change. Research has often been focused on genetic engineering to improve the tolerance of plants to abiotic and biotic stresses. Plant growth-promoting rhizobacteria (PGPR) are an alternative mechanism to improve the tolerance of plants to

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15

Kgang, Itumeleng Eugenia. "Characterisation of Amaranthus Tricolor mutant plants with increased drought-tolerance." Thesis, 2010. http://hdl.handle.net/10352/284.

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M. Tech. (Biotechnology, Department of Health Sciences), Vaal University of Technology<br>Amaranthus tricolor (A. tricolor) is a nutritious vegetable crop that is used as a subsistence and cash crop in the rural areas in Africa. Its yield and production is severely limited by abiotic stresses such as drought. Mutation technology, using gamma irradiation, was previously employed as a tool to create genetic variation in order to select for lines with improved drought-tolerance. During irradiation, 160 Gy (Gray) was selected as the optimal dosimetry that allowed subsequent seed germination. T

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16

Velloza, Theodosius Marmaduke. "Performance of perennial ryegrass (Lolium perenne L.) seed crops under water stress conditions." Thesis, 1997. http://hdl.handle.net/1957/33777.

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Summer drought is a major factor limiting the regrowth of perennial ryegrass seed crops. This phase of crop development has a strong influence on seed yield because most of the tillers that contribute towards next season's seed crop are produced or regrown during this period. In recent years many seed fields have exhibited premature decline probably because of extensive drought after harvesting. Therefore, this study was undertaken to (i) assess how post-harvest leaf and tiller development is impacted by the timing and severity of water stress and (ii) identify potential relationships of water

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17

Gouveia, Carla Susana Silva. "Study of drought tolerance responses in root and tuber crops using NIRS technology and biochemical markers model assessment." Doctoral thesis, 2021. http://hdl.handle.net/10400.13/3145.

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Batata-doce (Ipomoea batatas L.) e inhame (Colocasia esculenta L.) representam a segunda fonte alimentar mais importante do mundo. Atualmente, as alterações climáticas ameaçam a produtividade agrícola, principalmente devido à escassez de água, cujo efeito não é ainda suficientemente compreendido. As principais lacunas são a perceção do efeito da seca, através da eficiência no uso da água (WUE), bases bioquímicas e fisiológicas de produtividade e qualidade. Aqui, apresentamos os modelos das respostas de sete acessos de inhame e oito de batata-doce às condições de insuficiência hídrica, seg

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18

Miti, Francisco. "Breeding investigations of maize (Zea mays L.) genotypes for tolerance to low nitrogen and drought in Zambia." Thesis, 2007. http://hdl.handle.net/10413/2165.

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Low soil nitrogen (N) and drought impede maize production in the small-scale farming sector in Zambia; and adoption of new cultivars with improved tolerance might enhance production. This study: a) assessed farmer preferences for maize cultivars; b) determined genotype x environment interaction effects among popular maize cultivars under contrasting soil fertility levels and; c) investigated landraces for tolerance to low N and drought using S1 selection. The study was carried out in Zambia from 2004-07. Farmer preference influencing the adoption of maize cultivars was investigated using

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19

Ranjith, Subasinghe A. "Physiological responses of sugarcane to nitrogen and potassium availability." Thesis, 1994. http://hdl.handle.net/10125/9267.

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20

(5930507), Lisseth Zubieta. "Arbuscular mycorrhizal fungi: crop management systems alter community structure and affect soybean growth and tolerance to water stress." Thesis, 2019.

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<p>Arbuscular mycorrhizal fungi (AMF) are best known for their potential to help plants acquire nutrients, especially phosphorous. These microbes improve soil health by promoting soil aggregation and carbon sequestration, and further benefit plants by helping them withstand biotic and abiotic stress. Currently, there are 200 recognized species of AMF within the phylum Glomeromycota. Recent studies indicate that individual AMF species differ in the benefits they provide, with some even acting as parasites. Moreover, AMF community composition can be altered by soil and crop management practices,

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21

Munjonji, Lawrence. "Drought tolerant traits of triticale and cowpea genotypes under semi-arid conditions." Thesis, 2017. http://hdl.handle.net/10386/1913.

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Thesis (Ph.D. Agriculture (Soil Science)) -- University of Limpopo, 2017.<br>Climate change and variability pose a significant challenge to future global food security due to changes in mean climatic conditions which are rendering many areas marginally suitable for crop production. Erratic rains, drought, heat stress and declining soil fertility are some of the factors limiting crop productivity in many arid and semi-arid areas. Furthermore, water resources that could be used to mitigate drought and erratic rains, are also threatened by both scarcity and overuse. To ensure food security in the

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22

Vilakazi, Busisiwe. "The effect of water stress and storage conditions on seed quality of chickpea genotypes characterized by differences in seed size and coat colour." Diss., 2018. http://hdl.handle.net/11602/1086.

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MSCAGR (Plant Production)<br>Department of Plant Production<br>Chickpea (Cicer arietinum L.) is an excellent utilizer of residual soil moisture in agricultural ecosystems. However, its seed quality and hence reproduction is constrained by water stress, seed size and storage conditions. This study was carried out at the University of KwaZulu- Natal (UKZN), Pietermaritzburg Campus. It was conducted to evaluate the performance of chickpea genotypes (Desi-K, Saina-K and ICCV-K) with different seed sizes on seedling emergence (i), seed ageing effect on seed quality and imbibition of genotypes produ

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23

Mohammed, Khalaf Ali Hamam [Verfasser]. "Improving crop varieties of spring barley for drought and heat tolerance with AB-QTL-analysis / vorgelegt von Khalaf Ali Hamam Mohammed." 2004. http://d-nb.info/971680396/34.

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24

Yamauchi, Akira, and 章. 山内. "Studies on Root System of Crop Plants -Significance of Root System Structures in Relation to Waterlogging and Drought Tolerances in Cereals-." Thesis, 1988. http://hdl.handle.net/2237/6401.

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25

"Studies on Root System of Crop Plants -Significance of Root System Structures in Relation to Waterlogging and Drought Tolerances in Cereals-." Thesis, 1988. http://hdl.handle.net/2237/6401.

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26

Mabhaudhi, Tafadzwanashe. "Drought tolerance and water-use of selected South African landraces of Taro (Colocasia esculenta L. schott) and Bambara groundnut (Vigna subterranea L. Verdc)." Thesis, 2012. http://hdl.handle.net/10413/10027.

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Issues surrounding water scarcity will become topical in future as global fresh water resources become more limited thus threaten crop production. Predicted climate change and increasing population growth will place more pressure on agriculture to produce more food using less water. As such, efforts have now shifted to identifying previously neglected underutilised species (NUS) as possible crops that could be used to bridge the food gap in future. Taro (Colocasia esculenta L. Schott) and bambara groundnut (Vigna subterranea L. Verdc) currently occupy low levels of utilisation in South Africa.

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27

Odindo, Alfred Oduor. "Cowpea seed quality in response to production site and water stress." Thesis, 2007. http://hdl.handle.net/10413/75.

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Cowpea (Vigna unguiculata. L) is an important African crop. However, it is also an underutilized grain legume. Consequently, there is not enough research data on cowpea seed physiology. Whereas there is evidence of cowpea being a drought tolerant crop, there is no evidence to associate plant drought tolerance with seed quality in response to water stress. This study sought to understand the effect of production site and water stress on cowpea seed quality development with respect to germination capacity and vigour. Patterns of raffinose family of oligosaccharides (RFO) during seed development

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28

Mashilo, Jacob. "Response of dual-purpose cowpea landraces to water stress." Thesis, 2013. http://hdl.handle.net/10413/10873.

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Cowpea (Vigna unguiculata (L.) Walp) is an important protein-rich grain legume of major economic importance. It is widely grown by small-scale farmers in the arid and semi-arid regions of the world where it is cultivated for its leaves, fresh immature pods and dry grains. However, it is also an underutilized grain legume. In sub-Saharan Africa where most of the cowpea is produced, drought stress is one of the major factors limiting its productivity. Despite the inherent capacity to survive drought stress, several cowpea varieties are affected by mid and late season drought. Therefore, varietie

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29

Meyer, Matthias. "Trockenheitsreaktionen und holzanatomische Eigenschaften der Zitter-Pappel (Populus tremula L.) – Physiologie und QTL-Mapping." Doctoral thesis, 2009. https://tud.qucosa.de/id/qucosa%3A25310.

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Holz aus Kurzumtriebsplantagen (KUP) mit Pappeln (Populus spp.) kann eine bedeutende Rolle im Mix der Bioenergieressourcen in Deutschland spielen. Trotz eines günstigen Energieinput-Energieoutput-Verhältnisses ist das Erreichen wirtschaftlich zufriedenstellender Ergebnisse mit KUP jedoch auf den meisten potenziellen Anbauflächen durch hohe Ansprüche der Pappeln an die Wasserversorgung erschwert. Hohe Produktivitätsraten der Pappeln sind an einen hohen Wasserverbrauch gebunden und viele Trockenheitsanpassungen führen zu deutlichen Ertragsrückgängen. In der vorgestellten Arbeit wurde eine sechsj

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