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Abstract <p>Drought stress is a critical factor that adversely impacts the quality and yield of herbaceous plants. The application of exogenous spermidine has been shown to enhance plants’ drought tolerance. Root system architecture and anatomical structure play vital roles in plant roots’ absorption of water and nutrients. <i>Hordeum jubatum</i> L. is an ornamental species with potential applications in landscape, yet its root system’s response to drought stress remains largely unexplored. In this study, we investigated the effects of varying drought durations on the root system architecture and anatomical structure of <i>H. jubatum</i> following the exogenous application of different concentrations of spermidine. Our findings indicate that the root system of <i>H.&#xa0;jubatum</i> was increasingly affected by prolonged drought stress, while the application of exogenous spermidine mitigated these negative effects. Notably, spermidine treatment under extended drought conditions resulted in significant increases in total root length, total root surface area, root forks, average root diameter, endodermal thickness, cortical region thickness, cortical cell area, phloem area, pith cell area, and metaxylem area. These results suggest that the exogenous application of spermidine can effectively modulate the root system architecture and anatomy of <i>H. jubatum</i>, particularly under prolonged drought conditions.</p>

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Exogenous Spermidine Enhanced the Drought Tolerance in the Root of Hordeum jubatum by Modulating Root System Architecture and Anatomical Structure

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • C. Qin,
  • P. Han,
  • X. Di,
  • J. Zhang,
  • M. Siddique,
  • Z. Tan,
  • J. Liu,
  • J. Wang

摘要

Abstract

Drought stress is a critical factor that adversely impacts the quality and yield of herbaceous plants. The application of exogenous spermidine has been shown to enhance plants’ drought tolerance. Root system architecture and anatomical structure play vital roles in plant roots’ absorption of water and nutrients. Hordeum jubatum L. is an ornamental species with potential applications in landscape, yet its root system’s response to drought stress remains largely unexplored. In this study, we investigated the effects of varying drought durations on the root system architecture and anatomical structure of H. jubatum following the exogenous application of different concentrations of spermidine. Our findings indicate that the root system of H. jubatum was increasingly affected by prolonged drought stress, while the application of exogenous spermidine mitigated these negative effects. Notably, spermidine treatment under extended drought conditions resulted in significant increases in total root length, total root surface area, root forks, average root diameter, endodermal thickness, cortical region thickness, cortical cell area, phloem area, pith cell area, and metaxylem area. These results suggest that the exogenous application of spermidine can effectively modulate the root system architecture and anatomy of H. jubatum, particularly under prolonged drought conditions.