[Effect of exogenous α-naphthaleneacetic acid on carbon metabolism of soybean under drought stress at flowering stage].

With pot experiment, two soybean (Glycine max) varieties, Jindou 21 (drought-tole-rant) and Xudou 22 (drought-sensitive), were used to examine the effects of α-naphthaleneacetic acid (NAA) on carbon metabolism of soybean under drought stress at flowering stage. The results showed that under drought stress, compared to Xudou 22, Jindou 21 had smaller decrease in net photosynthetic rate (P), smaller increase in photorespiration rate (P) and soluble sugar content of leaves, while a greater increase in the activities of sucrose phosphate synthase (SPS) and sucrose synthetase (SS) (synthesis) of leaves and sucrose content of roots. NAA treatment increased P and decreased P under drought stress, and thus obviously alleviated the growth inhibition of drought stress on plants.