PJB-2017-700
Soybean seedling shows increased drought stress tolerance by spraying uniconazole
Naijie Feng
Abstract
As a class of plant growth regulators, uniconazole plays a very important role in the response to abiotic stress. However, the effect of uniconazole on leaf physiology and growth of soybean seedling under drought stress are little. Soybean variety of Suinong14 (Glycine max var.) (sensitive) and Heinong64 (Glycine max var.) (tolerant) were used to study the effects of uniconazole on soybean leaves photosynthetic characteristics and antioxidant activities or plant morphological structure under drought stress with pot experiment. The results showed that drought stress significantly depressed the growth. However, drought-stressed plants treated with uniconazole showed much higher biomass than those without uniconazole. And treatments of uniconazole on Heinong64 showed better results compared with Suinong14. Formation of longer of roots and more thicker stem diameter in uniconazole plants were noticed. Leaves of uniconazole plants exhibited a higher chlorophyll content, photosynthetic rate, transpiration rate and stomatal conductance, but lower lipid peroxidation contents and relative electrical conductivity as compared with those of the drought-stressed plants. Foliar soluble sugar, soluble protein content and activities of superoxide dismutase, peroxidase and catalase were increased by uniconazole in drought stress and in well−watered conditions. Collectively, the results indicated that uniconazole could effectively alleviate the adverse effects caused by drought stress, which was partially attributable to modifications in morphology and physiological characteristic.
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