Causes of sterility in seed set of rice under salinity stress

摘要: The effects of salinity at 50 mm NaCl on floral characteristics, yield components, and biochemical physiological attributes the sensitive rice variety IR-28 were studied under controlled conditions to determine causes sterility in seed set stress. results showed significant decreases panicle weight, length, primary branches/panicle, filled seeds/panicle, unfilled seeds/plant, total weight/panicle, 1000-seed weight weight/plant. sodium content different leaves parts increased significantly. In contrast, potassium was decreased significantly parts. A reduction chlorophyll a b also noted leaves. Inhibition transpiration photosynthesis observed flag grain-filling stage. Soluble carbohydrates reduced salinized plants but their increased, with exception secondary branch spikelets. Under stress, protein concentration flag, second third higher than control plants. viability pollen It further that starch synthetase activity (alpha1-4-glucan glucosyle transferases) developing grains inhibited very From these results, it is inferred reductions not merely due or inhibition constituents functions, mainly limitation soluble carbohydrate translocation spikelets, accumulation more less all parts, highly specific grains, thus resulting failure set.