Effects of Irrigation with Sodium Nitroprusside on Physiological Characteristics of Soybean under Drought Stress

LEGUME RESEARCH - AN INTERNATIONAL JOURNAL Pub Date : 2024-02-23 DOI:10.18805/lrf-784

W. Zhao, X.H. Wei, S. Dong

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Abstract

Background: Although it is a key soybean-producing region, northeast China frequently faces drought. Drought severely affects soybean growth, development and even leads to yield reduction. Methods: Sand cultivation method was employed to investigate the changes in malondialdehyde (MDA) content, nitric oxide (NO) content and individual leaf area of drought-tolerant soybean variety Heinong 44 (HN44) and drought-sensitive soybean variety Heinong 65 (HN65) under drought stress during the flowering stage, with different concentrations of sodium nitroprusside (SNP) used for irrigation. Result: The NO and MDA contents of HN44 and HN65 leaves rose in response to drought stress, MDA content in HN44 and HN65 leaves was noticeably elevated, the individual leaf area showed a downward trend. Irrigation with SNP further increased NO accumulation and reduced membrane lipid peroxidation in the leaves, with the best effect observed at a concentration of 1000 μmol·g-1. In practical production, SNP can be used to alleviate membrane lipid peroxidation damage in soybean leaves and improve soybean drought resistance when encountering drought.

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硝普钠灌溉对干旱胁迫下大豆生理特性的影响

背景：中国东北虽然是大豆主产区，但经常面临干旱。干旱严重影响大豆的生长发育，甚至导致减产。研究方法采用沙培法研究不同浓度硝普钠（SNP）灌溉下，耐旱大豆品种黑农 44（HN44）和对干旱敏感的大豆品种黑农 65（HN65）在开花期干旱胁迫下丙二醛（MDA）含量、一氧化氮（NO）含量和单叶面积的变化。结果HN44和HN65叶片中的NO和MDA含量随干旱胁迫而升高，HN44和HN65叶片中的MDA含量明显升高，单叶面积呈下降趋势。用 SNP 灌溉可进一步增加叶片中 NO 的积累并减少膜脂过氧化，浓度为 1000 μmol-g-1 时效果最佳。在实际生产中，SNP 可用于减轻大豆叶片的膜脂过氧化损伤，提高大豆在遇到干旱时的抗旱性。

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LEGUME RESEARCH - AN INTERNATIONAL JOURNAL

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