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<p>Drought is a major environmental factor limiting rice growth and yield, which causes huge economic losses. Poly-γ-glutamic acid (γ-PGA), a novel water retention agent, plays an essential role in plant response to adversity stresses. However, the role of γ-PGA in enhancing rice drought resistance remains unclear. Here, we investigated the effects of different soil γ-PGA concentrations (0, 0.2, 0.4, and 0.6&#xa0;g/kg) on the physiological response of rice at the tillering stage to drought stress using pot experiments. Our results showed that drought markedly inhibited rice growth, but the exogenous application of γ-PGA significantly increased leaf chlorophyll, soluble sugar, and proline contents, as well as antioxidant enzyme activities, under drought stress. In addition, γ-PGA dramatically reduced the accumulation of malondialdehyde(MDA) and H<sub>2</sub>O<sub>2</sub>. Further experiments revealed that γ-PGA increased the accumulation of abscisic acid (ABA) in rice under drought stress and regulated the expression of ABA signaling response-related genes, including <i>OsBOC1</i>, <i>OsRAB21</i>, <i>OsLEA17</i> and <i>OsRAB16A</i>. These findings suggest that the application of γ-PGA to the soil may effectively alleviate the impairment of rice physiological and metabolic functions under drought stress by activating the ABA signaling pathway and enhancing the plant’s resistance to drought.</p>

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Effect of external application of poly-γ-glutamic acid on the tillering stage of rice under drought stress

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Yanfei Wu,
  • Yiming Zhao,
  • Yue Wen,
  • Zixiang Li,
  • Yuquan Fu,
  • Xuezhu Du,
  • Feng Sheng

摘要

Drought is a major environmental factor limiting rice growth and yield, which causes huge economic losses. Poly-γ-glutamic acid (γ-PGA), a novel water retention agent, plays an essential role in plant response to adversity stresses. However, the role of γ-PGA in enhancing rice drought resistance remains unclear. Here, we investigated the effects of different soil γ-PGA concentrations (0, 0.2, 0.4, and 0.6 g/kg) on the physiological response of rice at the tillering stage to drought stress using pot experiments. Our results showed that drought markedly inhibited rice growth, but the exogenous application of γ-PGA significantly increased leaf chlorophyll, soluble sugar, and proline contents, as well as antioxidant enzyme activities, under drought stress. In addition, γ-PGA dramatically reduced the accumulation of malondialdehyde(MDA) and H2O2. Further experiments revealed that γ-PGA increased the accumulation of abscisic acid (ABA) in rice under drought stress and regulated the expression of ABA signaling response-related genes, including OsBOC1, OsRAB21, OsLEA17 and OsRAB16A. These findings suggest that the application of γ-PGA to the soil may effectively alleviate the impairment of rice physiological and metabolic functions under drought stress by activating the ABA signaling pathway and enhancing the plant’s resistance to drought.