The involvement of hydrogen peroxide (H2 O2 ) combined with sulfur (S) was studied in the protection of the photosynthetic performance of wheat (Triticum aestivum L.) under drought stress. The mechanisms of S-assimilation, the activity of antioxidants, glucose sensitivity, water and osmotic relations and abscisic acid (ABA) content were the focus. The combined application of 50 μM H2 O2 and 100 mg S kg-1 soil (sulfur) resulted in a marked increase in S-assimilation and activity of antioxidant enzymes, with decreased glucose sensitivity and ABA content causing improvement in the structure and function of the photosynthetic apparatus under drought stress. The photosynthetic performance, pigment system (PS) II activity and growth were improved conspicuously by H2 O2 in the presence of S, as H2 O2 induced S-assimilation capacity, the activity of antioxidant enzymes and GSH synthesis under drought stress. Our study shows that H2 O2 is more effective in the reversal of drought stress in the presence of S through its influence on S-assimilation, glucose sensitivity and antioxidant system. These results provide evidence for the effectiveness of H2 O2 in improving photosynthesis under drought stress in the presence of S. This article is protected by copyright. All rights reserved.

中文翻译：

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过氧化氢在硫存在下增强防御系统以保护干旱胁迫下小麦的叶绿体损伤和光合作用

研究了过氧化氢 (H2 O2) 与硫 (S) 结合对干旱胁迫下小麦 (Triticum aestivum L.) 光合性能的保护作用。S-同化机制、抗氧化剂活性、葡萄糖敏感性、水分和渗透关系以及脱落酸（ABA）含量是重点。50 μM H2 O2 和 100 mg S kg-1 土壤（硫）的联合施用导致 S-同化和抗氧化酶活性显着增加，葡萄糖敏感性和 ABA 含量降低，导致土壤结构和功能改善干旱胁迫下的光合装置。在 S 存在下，H2 O2 显着改善了光合性能、色素系统 (PS) II 活性和生长，因为 H2 O2 诱导了 S-同化能力，干旱胁迫下抗氧化酶活性和谷胱甘肽合成。我们的研究表明，H2 O2 通过影响 S 同化、葡萄糖敏感性和抗氧化系统，在 S 存在下更有效地逆转干旱胁迫。这些结果为 H2 O2 在 S 存在下在干旱胁迫下改善光合作用的有效性提供了证据。本文受版权保护。版权所有。本文受版权保护。版权所有。本文受版权保护。版权所有。