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Abstract <p>In this study, we evaluated photosynthesis, phytohormones, and redox reactions in maize (<i>Zea mays</i> L.) seedlings exposed to three different irrigation regimes under temperature elevation, including conventional irrigation (CI), partial root drying (PRD), and deficit irrigation (DI). Both PRD and DI led to partial stomatal closure. Under DI, non-stomatal factors and photochemical damage were responsible for the photosynthetic limitation observed with increasing temperature. However, the photosynthetic rate and actual PSII efficiency were maintained, and leaf water use was improved, specifically under PRD. Under severe high temperature, PRD was able to stabilize the levels of abscisic acid (ABA) and zeatin riboside (ZR), as well as the ABA/ZR ratio; inhibit the excessive generation of reactive oxygen species (ROS); increase the activities of protective antioxidant enzymes; and alleviate malondialdehyde (MDA) accumulation. Conversely, DI resulted in the excessive accumulation of ABA, ROS, and MDA with increasing temperature. Under high temperature, PRD strategy could exert its effects to produce cropping benefit.</p>

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Partial Root Drying Irrigation Mitigates Negative Impacts of Temperature Elevation on Photosynthesis, Phytohormones, and Redox Reactions in Maize

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • H. Yan,
  • X. Q. Zhang,
  • X. L. Liu,
  • M. B. Xia,
  • Z. G. Dai,
  • H. R. Zhang,
  • C. Ru

摘要

Abstract

In this study, we evaluated photosynthesis, phytohormones, and redox reactions in maize (Zea mays L.) seedlings exposed to three different irrigation regimes under temperature elevation, including conventional irrigation (CI), partial root drying (PRD), and deficit irrigation (DI). Both PRD and DI led to partial stomatal closure. Under DI, non-stomatal factors and photochemical damage were responsible for the photosynthetic limitation observed with increasing temperature. However, the photosynthetic rate and actual PSII efficiency were maintained, and leaf water use was improved, specifically under PRD. Under severe high temperature, PRD was able to stabilize the levels of abscisic acid (ABA) and zeatin riboside (ZR), as well as the ABA/ZR ratio; inhibit the excessive generation of reactive oxygen species (ROS); increase the activities of protective antioxidant enzymes; and alleviate malondialdehyde (MDA) accumulation. Conversely, DI resulted in the excessive accumulation of ABA, ROS, and MDA with increasing temperature. Under high temperature, PRD strategy could exert its effects to produce cropping benefit.