Effects of Drought-Stress on Cotton (Gossypium Hirsutum L.) and Host-Plant Resistance to Western Flower Thrips (Frankliniella Occidentalis Pergande) PDF Download
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Author: Justin G. Fiene
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
Herbivory by Western Flower Thrips (Frankliniella occidentalis Pergande) (WFT) and drought-stress due to limited water availability are currently two major factors that can severely impact cotton (Gossypium hirsutum L.) production. This dissertation examines the effects of drought-stress on cotton and host-plant resistance (HPR) to WFT in laboratory conditions, and seeks to identify the physiological and morphological mechanisms that underlie drought-tolerance and HPR. A life-history systems-approach was developed that provides a new level of detail for understanding how environmental variation impacts adult female WFT. The approach was illustrated by investigating the combined effects of cotton genotype, periodic drought-stress, and prey availability on the adult female omnivorous thrips using a factorial design. Three treatment conditions were significantly different, none of which were predicted based on prevailing ecological-hypotheses. At the same time, the approach produced three novel insights about WFT life-history and reproductive strategy. The roles of negative photo-taxis and leaf biomechanical properties were investigated as potential mechanisms that influence WFT foraging-decisions on individual cotyledons. Results showed that WFT foraging-decisions could be considered adaptive, but there was limited support for either of the mechanisms investigated. The physiological responses to drought stress and drought recovery were investigated for three transgenic cotton cultivars and an untransformed wild-type (WT). At peak drought, ABA levels, stomatal area, and stomatal apertures in the transgenic isolone, AtRAV1-1 were 48% lower, 27.7%, and 16.3% smaller than WT. These results suggest that AtRAV1-1 was the most drought-tolerant and support the hypothesis that changes in stomatal morphology may have functionally contributed to drought-tolerance. Lastly, I investigated whether changes in phytohormone concentrations associated with periodic-drought stress in four cotton cultivars (three transgenic and WT) were correlated with WFT feeding, fitness and state-dependent reproductive responses (i.e., the relationship between initial weight and reproduction). Results showed that JA-Ile and JA were positively correlated with state-dependent egg viability and fecundity, respectively, and negatively correlated with total egg viability and fecundity, respectively, supporting the hypothesis that JA and JA-Ile underlie the negative effects on WFT reproduction and the associated shift to state-dependent reproduction. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148186
Author: Justin G. Fiene
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
Herbivory by Western Flower Thrips (Frankliniella occidentalis Pergande) (WFT) and drought-stress due to limited water availability are currently two major factors that can severely impact cotton (Gossypium hirsutum L.) production. This dissertation examines the effects of drought-stress on cotton and host-plant resistance (HPR) to WFT in laboratory conditions, and seeks to identify the physiological and morphological mechanisms that underlie drought-tolerance and HPR. A life-history systems-approach was developed that provides a new level of detail for understanding how environmental variation impacts adult female WFT. The approach was illustrated by investigating the combined effects of cotton genotype, periodic drought-stress, and prey availability on the adult female omnivorous thrips using a factorial design. Three treatment conditions were significantly different, none of which were predicted based on prevailing ecological-hypotheses. At the same time, the approach produced three novel insights about WFT life-history and reproductive strategy. The roles of negative photo-taxis and leaf biomechanical properties were investigated as potential mechanisms that influence WFT foraging-decisions on individual cotyledons. Results showed that WFT foraging-decisions could be considered adaptive, but there was limited support for either of the mechanisms investigated. The physiological responses to drought stress and drought recovery were investigated for three transgenic cotton cultivars and an untransformed wild-type (WT). At peak drought, ABA levels, stomatal area, and stomatal apertures in the transgenic isolone, AtRAV1-1 were 48% lower, 27.7%, and 16.3% smaller than WT. These results suggest that AtRAV1-1 was the most drought-tolerant and support the hypothesis that changes in stomatal morphology may have functionally contributed to drought-tolerance. Lastly, I investigated whether changes in phytohormone concentrations associated with periodic-drought stress in four cotton cultivars (three transgenic and WT) were correlated with WFT feeding, fitness and state-dependent reproductive responses (i.e., the relationship between initial weight and reproduction). Results showed that JA-Ile and JA were positively correlated with state-dependent egg viability and fecundity, respectively, and negatively correlated with total egg viability and fecundity, respectively, supporting the hypothesis that JA and JA-Ile underlie the negative effects on WFT reproduction and the associated shift to state-dependent reproduction. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148186
Author: John Joseph Jr Krauska
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Drought is a concern for crop production in the High Plains region of the United States which is predicted by climate models to become exacerbated by regional climatic changes and high-output irrigation that is diminishing the finite underground water resources of the Ogallala Aquifer. In addition to drought conditions, changes in pest pressure due to indirect effects of drought stress also occur. The western flower thrips (Frankliniella occidentalis) is known as an economically important early-season pest insect pest of cotton and it also preys on the eggs of the herbivorous twospotted spider mite (Tetranychus urticae). It is unknown how the relationship between these two arthropod species could be altered during drought conditions in an agricultural setting. Chapter 1 discusses the interplay of these issues and states that the overall goal of the thesis was to examine the net effect of drought on plant-arthropod interactions. Chapter 2 examined the three-way responses of the plant and two arthropods to drought stress in a controlled greenhouse environment over a two week period. Drought conditions directly reduced spider mite populations, plant development, and stomatal gas exchange. Also, drought had indirect negative effects on plant development and physiological functions from the pestiferous activity of the arthropod populations. We infer that these plant responses reduced the seedling's quality as a host plant which resulted in the observed reductions in spider mite populations when thrips were absent as well as when they were present. The net effect of drought on seedling cotton was compounded by the arthropod dynamics, despite any predation thrips may have enacted on the mite egg populations. Chapter 3 examined the question: do thrips adjust their omnivorous feeding behavior under drought conditions? We approached this question with a 72-hour experiment in which we recorded the amount of herbivorous and predacious feeding by thrips under well-watered and drought conditions. Thrips consumed more mite eggs under drought conditions while the amount of thrips feeding scars on the plant remained the same. We suspect that thrips are supplementing their diet with mite eggs because of reduced plant quality and potential plant defense hormones. Chapter 4 expands on how the results from these two experiments support our conclusion that the net effect of drought stress is largely negative for early-season cotton seedlings. Application of the findings from this thesis can assist with present-day pest and crop management in areas such as proper pesticide utilization and water conservation, which will prepare crop producers for future climatic conditions.
Author: Dimitra Loka
Publisher:
ISBN: 9781267311016
Category : Cotton
Languages : en
Pages : 410
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Book Description
Water deficit is a major abiotic factor limiting plant growth and crop productivity around the world. Cotton (Gossypium hirsutum L.) is considered to be relatively tolerant to drought and the effects of water stress on leaf physiology and metabolism have been extensively documented. However, information is lacking on the effect of water-deficit stress on the cotton flower. It was hypothesized that water-deficit stress would impair gas exchange functions which consequently would result in perturbation of carbohydrates of cotton reproductive units. To investigate this hypothesis growth room studies and field studies were conducted with the objectives being to document the physiological and biochemical changes that take place in cotton flowers and their subtending leaves when subjected to limited water supply. Additionally, the effect of the ethylene inhibitor 1-Methylcyclopropene under conditions of water stress was investigated as well as the response of leaf and ovary polyamine metabolism of two cotton cultivars differing in drought tolerance. Results indicated that water-deficit stress during flowering significantly compromised leaf gas exchange functions resulting in decreased stomatal conductance, photosynthesis, respiration and water potential. However, cotton reproductive units appeared to be less drought-sensitive compared to the leaves possibly due to higher water potential and glutathione reductase activity. Limited supply of water significantly affected carbohydrate metabolism of both leaf and pistil resulting in carbohydrate accumulation. Contrary to expectations, application of the ethylene inhibitor 1-MCP had no effect on leaf gas exchange function, however, it reversed the effect of water stress on pistil sucrose concentrations. Finally, water-deficit stress during flowering had a significant effect on polyamine metabolism of both leaf and pistil, resulting in increases in putrescine, spermidine and spermine in drought-sensitive cultivars. The differential response of polyamine metabolism between drought-sensitive and tolerant cultivars suggests that polyamines could be effective tools not only in selection of drought-tolerant cultivars, but also in drought tolerance engineering, however further research is needed in order to elucidate the exact pathways of their action.
Author: Julio Cesar Viglioni Penna
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Book Description
Evaluation and screening for drought resistance; Root studies; Water relations and other studies; Other aspects of drought resistance; Pre-conditioning; Age of tissues; Water stress and physiological processes; Biochemical effects of water stress; Screening for seedling survival under drought conditions root-shoot study.
Author: Cassandra Ray Meek
Publisher:
ISBN:
Category : Cotton
Languages : en
Pages : 312
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Book Description
Author: G. A. Matthews
Publisher: Oxford University Press, USA
ISBN:
Category : Science
Languages : en
Pages : 624
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Book Description
The cotton plant; Insects and mites; Pest management.
Author: Hugo Campos
Publisher: Springer Nature
ISBN: 3030286835
Category : Science
Languages : en
Pages : 524
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Book Description
This book is open access under a CC BY 4.0 license. This book provides a fresh, updated and science-based perspective on the current status and prospects of the diverse array of topics related to the potato, and was written by distinguished scientists with hands-on global experience in research aspects related to potato. The potato is the third most important global food crop in terms of consumption. Being the only vegetatively propagated species among the world’s main five staple crops creates both issues and opportunities for the potato: on the one hand, this constrains the speed of its geographic expansion and its options for international commercialization and distribution when compared with commodity crops such as maize, wheat or rice. On the other, it provides an effective insulation against speculation and unforeseen spikes in commodity prices, since the potato does not represent a good traded on global markets. These two factors highlight the underappreciated and underrated role of the potato as a dependable nutrition security crop, one that can mitigate turmoil in world food supply and demand and political instability in some developing countries. Increasingly, the global role of the potato has expanded from a profitable crop in developing countries to a crop providing income and nutrition security in developing ones. This book will appeal to academics and students of crop sciences, but also policy makers and other stakeholders involved in the potato and its contribution to humankind’s food security.
Author: Omkar
Publisher: Springer Nature
ISBN: 9811561494
Category : Science
Languages : en
Pages : 515
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Book Description
Sucking pests are most notorious group of pests for agricultural crops. Unlike most pests with chewing mouth parts, sucking pests cause more severe damage to the crops and are complex to get identified until advanced stages of infection. Not only is this late detection detrimental to their effective control, sucking pests also often cause fungal growth and virus transmission. The book emphasizes on sucking pests of most major crops of India. It aims to reflect Indian scenario before the international readership. This book complies comprehensive information on sucking pests of crops and brings the attention of the readers to this multiple damage causing insect complex. The chapters are contributed by highly experienced Indigenous experts from Universities & ICAR institutes, and book collates useful content for students and young researchers in plant pathology, entomology and agriculture.
Author: Waqas Wakil
Publisher: Academic Press
ISBN: 0128135085
Category : Science
Languages : en
Pages : 374
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Book Description
Sustainable Management of Arthropod Pests of Tomato provides insight into the proper and appropriate application of pesticides and the integration of alternative pest management methods. The basis of good crop management decisions is a better understanding of the crop ecosystem, including the pests, their natural enemies, and the crop itself. This book provides a global overview of the biology and management of key arthropod pests of tomatoes, including arthropod-vectored diseases. It includes information that places tomatoes in terms of global food production and food security, with each pest chapter including the predators and parasitoids that have specifically been found to have the greatest impact on reducing that particular pest. In-depth coverage of the development of resistance in tomato plants and the biotic and abiotic elicitors of resistance and detailed information about the sustainable management of tomato pests is also presented. - Provides basic biological and management information for arthropod pests of tomato from a global perspective, encompassing all production types (field, protected, organic) - Includes chapters on integrated management of tomato pests and specific aspects of tomato pest management, including within protected structures and in organic production - Presents management systems that have been tested in the real-world by the authors of each chapter - Fully illustrated throughout with line drawings and color plates that illustrate key pest and beneficial arthropods associated with tomato production around the world
Author: Surinder Kumar Gupta
Publisher: Academic Press
ISBN: 0128014695
Category : Science
Languages : en
Pages : 584
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Book Description
Breeding Oilseed Crops for Sustainable Production: Opportunities and Constraints presents key insights into accelerating the breeding of sustainable and superior varieties. The book explores the genetic engineering/biotechnology that has played a vital role in transforming economically important traits from distant/wild species to cultivated varieties, enhancing the quality and quantity of oil and seed yield production. Integrated nutrient management, efficient water management, and forecasting models for pests diseases outbreaks and integrated pest and pest management have also added new dimensions in breeding for sustainable production. With the rise in demand, the scientific community has responded positively by directing a greater amount of research towards sustainable production both for edible and industrial uses. Covering the latest information on various major world oil crops including rapeseed mustard, sunflower, groundnut, sesame, oilpalm, cotton, linseed/flax, castor and olive, this book brings the latest advances together in a single volume for researchers and advanced level students. Describes various methods and systems to achieve sustainable production in all major oilseed crops Addresses breeding, biology and utilization aspects simultaneously including those species whose information is not available elsewhere Includes information on modern biotechnological and molecular techniques and production technologies Relevant for international government, industrial and academic programs in research and development
