Effects of soil drought on antioxidative metabolism of soybean pod subtending leaf during flowering and pod periods
In order to understand the physiological mechanism of drought stress affecting premature leaf senes-cence of the pod subtending leaf during flowering and pod period,a pot experiment was conducted in Hefei,Anhui Province from 2021 to 2022. The effects of drought stress on the endogenous protective enzyme system and ascor-bate glutathione cycle were studied based on the antioxidant metabolism system at soil water content (SWC) (75±5)％,(60±5)％ and (45±5)％ on two soybean varieties (Wandou 37,drought weak sensitive variety;Wandou 38,drought sensitive variety). The results revealed that drought accelerated the senescence of pod subtending leaf,with SPAD decreasing by 8.0％-24.2％ for Wandou 37 and by 12.4％-32.9％ for Wandou 38. The activities of superox-ide dismutase (SOD) and peroxidase (POD) and the content of ascorbic acid (ASA) were significantly increased in the pod subtending leaf,however the activities of ascorbate oxidase (APX),dehydroascorbate reductase (DHAR) and glutathione reductase (GR) were inhibited by drought stress. A large amount of H2O2 and O2-could not be complete-ly removed,resulting in the increase of H2O2 and MDA content,and the increase of O2-production rate,which result-ed in acceleration of leaf senescence. SWC (45±5)％ treatment was significantly higher than SWC (60±5)％ treat-ment,and the results were consistent between the two varieties. Compared with Wandou 38,Wandou 37 had higher GR and PAX activities under drought stress,increased ASA content,reduced H2O2 and O2-accumulation,and re-duced the degree of membrane lipid peroxidation. Therefore it improved the resistance to drought adversity.
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