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Key message <p><b>Xushu 32 and Yanshu 25 were chosen as drought-sensitive and drought-tolerant cultivars, respectively. The drought tolerance in sweetpotato was associated with enhanced antioxidant activities and K</b><sup><b>+</b></sup><b> retention in roots.</b></p> Abstract <p>A foundational understanding of the tolerance mechanisms is crucial for the effective breeding of drought-tolerant sweetpotato cultivars. In this study, 27 sweetpotato cultivars were screened to assess drought stress tolerance under water-limited drought and PEG-simulated drought stresses. Based on the analysis of three methods—practical drought tolerance evaluation (harvest index and phenotype identification) and comprehensive drought tolerance coefficient, the 27 cultivars were classified into four categories, and Xushu 32 and Yanshu 25 were chosen as drought-sensitive and drought-tolerant cultivars, respectively. Moreover, root K<sup>+</sup> content positively correlated with root antioxidant activities. Pharmacological evidence indicated that root K<sup>+</sup> retention might be regulated by Shaker K<sup>+</sup> channels and non-selective cation channels. Critically, drought-induced damage was significantly alleviated by exogenous K<sup>+</sup> supply in sweetpotato plants, confirming higher root antioxidant activities and superior K<sup>+</sup> retention capacity in Yanshu 25 (drought-tolerant).</p>

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Antioxidant capacity and root K+ retention: regulation mechanisms of drought tolerance in sweetpotato

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Chengkang Xue,
  • Minfei Sheng,
  • Jiayuan Zhu,
  • Jinping He,
  • Zhiyuan Pan,
  • Zhaoxia Liao,
  • Jian Sun,
  • Yaoyao Wu,
  • Yang Dong,
  • Zongyun Li,
  • Jingran Liu

摘要

Key message

Xushu 32 and Yanshu 25 were chosen as drought-sensitive and drought-tolerant cultivars, respectively. The drought tolerance in sweetpotato was associated with enhanced antioxidant activities and K+ retention in roots.

Abstract

A foundational understanding of the tolerance mechanisms is crucial for the effective breeding of drought-tolerant sweetpotato cultivars. In this study, 27 sweetpotato cultivars were screened to assess drought stress tolerance under water-limited drought and PEG-simulated drought stresses. Based on the analysis of three methods—practical drought tolerance evaluation (harvest index and phenotype identification) and comprehensive drought tolerance coefficient, the 27 cultivars were classified into four categories, and Xushu 32 and Yanshu 25 were chosen as drought-sensitive and drought-tolerant cultivars, respectively. Moreover, root K+ content positively correlated with root antioxidant activities. Pharmacological evidence indicated that root K+ retention might be regulated by Shaker K+ channels and non-selective cation channels. Critically, drought-induced damage was significantly alleviated by exogenous K+ supply in sweetpotato plants, confirming higher root antioxidant activities and superior K+ retention capacity in Yanshu 25 (drought-tolerant).