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" Effects of high temperature stress on the anatomy and biochemistry of pollen-pistil interactions in cotton "
/John Snider
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سازمان تحقیقات، آموزش و جهاد کشاورزی
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| Document Type
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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18577778
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| Call number
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TL1323
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| Main Entry
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Snider, John
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| Title & Author
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Effects of high temperature stress on the anatomy and biochemistry of pollen-pistil interactions in cotton/John Snider
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| College
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University of Arkansas
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| Date
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, 2010
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| Degree
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Ph.D.
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| Page No
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203 pages
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| Abstract
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The day of anthesis is a critical event in the reproductive development of cotton, but information on the effect of high temperature on in vivo reproductive processes and biochemical events in the pistil is sparse. The effect of high temperature on reproductive success in cotton was investigated in the growth chamber and field, and the possible role of cultivar and exogenous calcium application in promoting reproductive thermotolerance was evaluated. In the pistil of a thermosensitive cotton cultivar, heat stress resulted in significant declines in fertilization efficiency, soluble carbohydrates, adenosine triphosphate (ATP), and nicotinamide dinucleotide diphosphate (NADPH) oxidase activity, and increased water soluble calcium content and glutathione reductase (GR) activity. In the subtending leaves, heat stress reduced photosynthesis, chlorophyll content, and quantum efficiency but increased stomatal conductance. A thermotolerant cultivar was characterized by having higher fertilization efficiencies under heat stress, higher pre-stress levels of antioxidant enzyme activity (both GR and superoxide dismutase) and higher levels of ATP, water soluble calcium, and total calcium in the pistil. Reproductive thermotolerance was also associated with higher photosynthetic thermostability due to higher pre-stress antioxidant enzyme activity in the subtending leaf. Moderately high temperature in the field primarily limited pollen tube growth by causing a carbohydrate imbalance in the pistil. It is concluded that reproductive thermotolerance in cotton is associated with elevated pre-stress antioxidant enzyme activity in the pistil and the subtending leaf that may protect against rapid temperature fluctuations that occur under field conditions. Also, the carbohydrate, ATP and calcium content of the cotton pistil are strong determinants of reproductive thermotolerance in cotton.
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| Descriptor
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Temperature
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Pollen-pistil interactions
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Cotton
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Fertilization
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Carbohydrates
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Antioxidants
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| Added Entry
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Oosterhuis, Derrick M.
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| electronic file name
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TL1323.pdf
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