Effects of Drought Stress on Key Enzymes of Carbon Metabolism, Photosynthetic Characteristics and Agronomic Traits of Soybean at the Flowering Stage under Different Soil Substrates

Soybean is an important legume food crop, and its seeds are rich in nutrients, providing humans animals with edible oil protein feed. However, soybean sensitive to water requirements, drought factor limiting yield quality. This study used Heinong 84 (drought resistant variety) Hefeng 46 (intermediate as tested varieties planted chernozem, albic, black soils. The effects of stress on the activities key enzymes carbon metabolism photosynthetic characteristics were studied during flowering stage, most water. (1) SS-1, 6PGDH, G6PDH leaves first increased then decreased under stress. enzyme activity was highest moderate weakest blank group. (2) Drought Phi2, PhiNO, Fm reached value severe drought; increase stress, PhiNPQ Fv/Fm gradually decreased, reaching lowest drought. (3) With F0 Fs showed a single peak curve, maximum at (4) Correlation analysis that greatly affected by soil types; Fs, F0, had great influence, chlorophyll fluorescence parameters differently different degrees. (5) changed agronomic traits soybean. degree, plant height, node number main stem, effective pod number, 100-seed weight total continuously. (6) dry matter accumulation decreased. Among them, leaf seriously drought, SD about 55% compared CK. Under condition soil, least