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<Emphasis Type="BoldItalic">Key message</Emphasis> <p><b>Exogenously applied GB improved photosynthetic capacity, promoted the accumulation of soluble sugars, and maintained ROS homeostasis in</b><Emphasis Type="BoldItalic"> Davidia involucrata</Emphasis><b> under drought stress.</b></p> Abstract <p><i>Davidia involucrata</i>, a deciduous and endangered “living fossil” tree species, is native to mountainous regions in south-central and southwestern China. Despite the fact that drought stress severely constrains the conservation and utilization of <i>D. involucrata</i> resources, effective strategies for improving drought tolerance in this endangered species are still largely unexplored. This study aimed to examine the impact of exogenously applied glycine betaine (GB) on the tolerance to drought stress in <i>D. involucrata</i>. The results revealed that pre-treatment with 25 mM GB effectively alleviated drought-induced damage of <i>D. involucrata</i> seedlings. GB application significantly mitigated growth inhibition and concurrently enhanced chlorophyll accumulation in <i>D. involucrata</i> seedlings subjected to drought. Exogenous GB protected the photosynthetic electron transport system, maintained structural stability of the reaction center, and up-regulated the expression of photosystem II (PSII) subunit genes (<i>DiPsbA</i>, <i>DiPsbP</i>) as well as Calvin cycle-related genes (<i>DiRbcL</i>, <i>DiRbcS</i>, <i>DiFBPase</i>, <i>DiSBPase</i>), leading to improved photosynthetic capacity under drought stress. Furthermore, GB-mediated drought tolerance could also involve increased accumulation of soluble sugars, including glucose, fructose, and sucrose. Finally, we reveal that GB application can substantially enhance antioxidant enzyme activities and preserve ROS equilibrium under drought condition. Overall, this study demonstrated for the first time that exogenous GB plays a positive role during drought stress response in <i>D. involucrata</i> seedlings.</p>

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Application of glycine betaine promotes drought tolerance in Davidia involucrata by regulating photosynthetic efficiency, soluble sugar accumulation, and ROS homeostasis

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • Lu Xiang,
  • Xiao Xu,
  • Qinsong Liu

摘要

Key message

Exogenously applied GB improved photosynthetic capacity, promoted the accumulation of soluble sugars, and maintained ROS homeostasis in Davidia involucrata under drought stress.

Abstract

Davidia involucrata, a deciduous and endangered “living fossil” tree species, is native to mountainous regions in south-central and southwestern China. Despite the fact that drought stress severely constrains the conservation and utilization of D. involucrata resources, effective strategies for improving drought tolerance in this endangered species are still largely unexplored. This study aimed to examine the impact of exogenously applied glycine betaine (GB) on the tolerance to drought stress in D. involucrata. The results revealed that pre-treatment with 25 mM GB effectively alleviated drought-induced damage of D. involucrata seedlings. GB application significantly mitigated growth inhibition and concurrently enhanced chlorophyll accumulation in D. involucrata seedlings subjected to drought. Exogenous GB protected the photosynthetic electron transport system, maintained structural stability of the reaction center, and up-regulated the expression of photosystem II (PSII) subunit genes (DiPsbA, DiPsbP) as well as Calvin cycle-related genes (DiRbcL, DiRbcS, DiFBPase, DiSBPase), leading to improved photosynthetic capacity under drought stress. Furthermore, GB-mediated drought tolerance could also involve increased accumulation of soluble sugars, including glucose, fructose, and sucrose. Finally, we reveal that GB application can substantially enhance antioxidant enzyme activities and preserve ROS equilibrium under drought condition. Overall, this study demonstrated for the first time that exogenous GB plays a positive role during drought stress response in D. involucrata seedlings.