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弱干旱和强干旱条件对开花期大豆生理稳定性的影响

Effects of Weak and Strong Drought Conditions on Physiological Stability of Flowering Soybean.

作者信息

Song Shuang, Qu Zhipeng, Zhou Xinyu, Wang Xiyue, Dong Shoukun

机构信息

College of Agriculture, Northeast Agricultural University, Harbin 150030, China.

出版信息

Plants (Basel). 2022 Oct 13;11(20):2708. doi: 10.3390/plants11202708.

DOI:10.3390/plants11202708
PMID:36297732
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9607976/
Abstract

Soybean is an important food crop in the world. Drought can seriously affect the yield and quality of soybean; however, studies on extreme drought-weak and strong-are absent. In this study, drought-tolerant soybean Heinong 44 (HN44) and sensitive soybean Heinong 65 (HN65) were used as the test varieties, and the effects of strong and weak droughts on the physiological stability of soybean were explored through the drought treatment of soybean at the early flowering stage. The results showed that the contents of malondialdehyde (MDA), hydrogen peroxide (HO), and superoxide anions (O2·-) increased with the increase in the degree of drought. The plant height and relative water content decreased, and photosynthesis was inhibited. The activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT), and the total antioxidant capacity (T-AOC) showed a trend of first increasing and then decreasing. Through contribution analysis, CAT changed the most, and the role of SOD gradually increased with the aggravation of drought. With the aggravation of drought, the contents of soluble sugar (SSC) and proline (Pro) increased gradually, and the content of soluble protein (SP) increased initially and then decreased. According to contribution analysis, SSC had the highest contribution to osmotic adjustment. SSC and Pro showed an upward trend with the aggravation of drought, indicating that their role in drought was gradually enhanced.

摘要

大豆是世界上重要的粮食作物。干旱会严重影响大豆的产量和品质；然而，关于极端干旱（弱干旱和强干旱）的研究却很缺乏。本研究以耐旱大豆品种黑农44（HN44）和敏感大豆品种黑农65（HN65）为试验材料，通过对初花期大豆进行干旱处理，探究强弱干旱对大豆生理稳定性的影响。结果表明，丙二醛（MDA）、过氧化氢（HO）和超氧阴离子（O2·-）的含量随着干旱程度的增加而增加。株高和相对含水量降低，光合作用受到抑制。超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）的活性以及总抗氧化能力（T-AOC）呈先升高后降低的趋势。通过贡献分析可知，CAT变化最大，SOD的作用随着干旱的加剧而逐渐增强。随着干旱的加剧，可溶性糖（SSC）和脯氨酸（Pro）的含量逐渐增加，可溶性蛋白（SP）的含量先升高后降低。根据贡献分析，SSC对渗透调节的贡献最大。SSC和Pro随着干旱的加剧呈上升趋势，表明它们在干旱中的作用逐渐增强。

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