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Abstract <p>The root system is key to plant uptake of soil water and nutrients, and abiotic stresses can inhibit root development and limit plant growth. Previous studies have shown that exogenous hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) inhibits the gravitropism of primary roots in pea, but the effect is not significant in other species. In this study, pea and corn seed germination was induced by different concentrations of exogenous H<sub>2</sub>O<sub>2</sub>, using gramineous corn as a control. The results of the study showed that there was a dose effect of germination potential of pea and maize on H<sub>2</sub>O<sub>2</sub> concentration, with the increase of exogenous H<sub>2</sub>O<sub>2</sub> concentration pea primary root curvature increased significantly, endogenous H<sub>2</sub>O<sub>2</sub> content decreased, superoxide anion (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11183_2025_9014_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="31" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{O}}_{2}^{{\bullet - }}\)</EquationSource> <!--PlntPhys2460847Li-m1--> </InlineEquation>) content increased, peroxidase (POD) activity increased and superoxide dismutase (SOD) activity weakened. While there was no significant difference in the relevant indicators for maize. Correlation analysis showed that POD activity in pea primary roots was significantly positively correlated with bending rate, and SOD and endogenous H<sub>2</sub>O<sub>2</sub> were significantly negatively correlated. In summary, exogenous H<sub>2</sub>O<sub>2</sub> may inhibit root gravitropism by modulating endogenous ROS content and antioxidant enzyme activities in pea primary roots. This provides new insights into the growth mechanism of pea primary roots under abiotic stress.</p>

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Pisum sativum (Pea) and Zea mays (Maize) Primary Roots Differentially Respond to Exogenous H2O2 Regulation of Their Growth

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • H. Li,
  • R. Wei,
  • L. Wu,
  • K. Li,
  • S. Ma,
  • S. Li

摘要

Abstract

The root system is key to plant uptake of soil water and nutrients, and abiotic stresses can inhibit root development and limit plant growth. Previous studies have shown that exogenous hydrogen peroxide (H2O2) inhibits the gravitropism of primary roots in pea, but the effect is not significant in other species. In this study, pea and corn seed germination was induced by different concentrations of exogenous H2O2, using gramineous corn as a control. The results of the study showed that there was a dose effect of germination potential of pea and maize on H2O2 concentration, with the increase of exogenous H2O2 concentration pea primary root curvature increased significantly, endogenous H2O2 content decreased, superoxide anion ( \({\text{O}}_{2}^{{\bullet - }}\) ) content increased, peroxidase (POD) activity increased and superoxide dismutase (SOD) activity weakened. While there was no significant difference in the relevant indicators for maize. Correlation analysis showed that POD activity in pea primary roots was significantly positively correlated with bending rate, and SOD and endogenous H2O2 were significantly negatively correlated. In summary, exogenous H2O2 may inhibit root gravitropism by modulating endogenous ROS content and antioxidant enzyme activities in pea primary roots. This provides new insights into the growth mechanism of pea primary roots under abiotic stress.