Research Progress on Heat Tolerance and Regulatory Strategies of Plant Leaves

doi:10.7525/j.issn.1673-5102.2025.02.003

Abstract

Abstract:

Under the background of global warming， plant leaves are facing increasingly severe heat stress， which widely affects their growth， development， and productivity. Leaf temperature directly affects important physiological processes of plants such as photosynthesis， transpiration， and respiration. Therefore， clarifying high-temperature tolerance mechanism of plant leaves is of great significance. In this paper， the methods for determining leaf heat tolerance parameters were used， including the key parameters such as initial fluorescence （F₀） and maximum quantum yield（F_v/F_m）， as well as indicators reflecting the leaf's heat tolerance ability， such as the temperature at which the minimum fluorescence of photosystem Ⅱ（PSⅡ） began to rise rapidly（T_crit） and the temperature at which the maximum quantum yield（F_v/F_m） of photosystem Ⅱ（PSⅡ） decreased to half（T₅₀） were determined respectively. By analyzing the previous results on the heat tolerance of leaves among different species， it was found that heat-tolerant species had higher T_crit and lower leaf heat sensitivity（ΔT）， and could maintain the function of photosystem Ⅱ（PSⅡ） at higher temperatures. In addition， the roles of temperature regulation strategies such as leaf morphological structure， water loss， and stomatal regulation in leaf high-temperature tolerance were discussed respectively. In conclusion， the adaptation mechanism of plant leaves under high-temperature conditions was revealed by analyzing leaf heat tolerance parameters and temperature regulation strategies， and this work provided the structure and physiology basis for understanding the mechanism of plant leaf high-temperature tolerance， and theoretical support for future in-depth research on plant heat tolerance.

Key words: leaf temperature, morphological structure, stomatal regulation, heat tolerance, thermal safety margin

CLC Number:

Q945.79

Baojie TONG, Dongying DAN, Jiawei LI. Research Progress on Heat Tolerance and Regulatory Strategies of Plant Leaves[J]. Bulletin of Botanical Research, 2025, 45(2): 171-180.

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