Role of Environment During Seed Development On Subsequent Seed Quality of Cowpea (Vigna Unguiculata)
Role of Environment During Seed Development On Subsequent Seed Quality of Cowpea (Vigna Unguiculata)
Tang, An-Ching Cheng
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If cowpea is grown in a temperate region, the first frost might come before seed development is complete due to a prolonged growth period at the lower temperatures. This might result in seed immaturity, which would further reduce seed vigor. When searching for high yield traits in cowpea, breeders should observe any adverse influences of high or low temp- erature during seed development on subsequent seed vigor and separate it from real genetic characteristics. 117 Under water stress 'Pinkeye P...urple Hull' produced only a few seeds, but of high quality. 'Texas Cream 40' was drought sensitive; both seed yield and vigor were reduced. Decreases in embryo size and nutrient accumulation in the cotyledons contributed to the reduced seed vigor of this cultivar. Many immature pods abscised and no flowers set new pods after exposure to drought stress. This implied that drought had a direct influence on fruit set, thus, seed development. Decreases in starch concentration in seeds of 'Texas Cream 40' probably resulted from a reduction in photosynthesis during water stress, as observed by the rapid leaf senescence which occurred.
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