Response Characteristics of Drought Stress and Its Physiological Regulatory Mechanisms in Spring Wheat Developmental Stages

doi:10.11924/j.issn.1000-6850.casb2025-0033

Abstract

Abstract:

To explore the response characteristics of spring wheat developmental stages to drought stress and its physiological regulatory mechanisms, and to scientifically address the challenges posed by climate change, ‘Dingxi New 24’ was selected as experimental material, and methods such as curve fitting and correlation analysis were employed to analyze the change characteristics in soil moisture, crop developmental stages, and physio-ecological parameters under two drought stress conditions: field and pot experiments. The results showed that: (1) under continuous drought stress, the booting, heading, and flowering stages of field wheat were shortened by 1 day, 1 day, and 8 days, respectively, while the milk stage was extended by 5 days. The heading stage of potted wheat was delayed by 2 days, and the flowering stage was shortened by 6 days. (2) The soil moisture stress factor, constructed based on exponential and linear models, could effectively simulate the developmental stages changes caused by drought stress. (3) When the soil relative humidity was between 45% and 53%, the photosynthetic physiological parameters and leaf water status indicators exerted a reverse regulatory effect on the advancement of the jointing-to-flowering stages in field wheat. When the soil relative humidity dropped below 45%, both factors then synergistically promoted an earlier milk stage. For potted wheat subjected to drought starting from the booting stage, all leaf physiological indicators worked together to prolong the heading stage. These findings provide a scientific basis for the dynamic monitoring, prediction, and impact assessment of drought in spring wheat in semi-arid regions.

Key words: drought stress, developmental stages simulation, soil moisture stress factors, physiological regulation mechanism, spring wheat, phenology, photosynthetic parameters, leaf water potential

CHEN Fei, ZHAO Hong, WANG Heling, YANG Yang, WANG Runyuan, ZHANG Kai, ZHAO Funian, QI Yue, TANG Yurui, WEI Xingxing. Response Characteristics of Drought Stress and Its Physiological Regulatory Mechanisms in Spring Wheat Developmental Stages[J]. Chinese Agricultural Science Bulletin, 2025, 41(33): 14-23.

Figures/Tables 10

References 35

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发育阶段	∆LWC/%	∆P_n/[μmol/(m²·s)]	∆g_s/[mol/(m²·s)]	∆T_r/[μmol/(m²·s)]	∆C_i/(μmol/mol)
拔节—孕穗	-0.301	0.904^*	0.869	0.905^*	0.842
孕穗—抽穗	-0.07	0.016	0.252	0.22	0.205
抽穗—开花	-0.749	0.659	-0.878	0.344	0.588
开花—乳熟	0.927^**	0.656^*	0.502	0.55^*	-0.686^**
孕穗中期—乳熟	0.927^**	0.744^**	0.407	0.715^**	-0.748^**

发育阶段	∆LWC/%	∆P_n/[μmol/(m²·s)]	∆g_s/[mol/(m²·s)]	∆T_r/[μmol/(m²·s)]	∆C_i/(μmol/mol)
拔节—孕穗	-0.301	0.904^*	0.869	0.905^*	0.842
孕穗—抽穗	-0.07	0.016	0.252	0.22	0.205
抽穗—开花	-0.749	0.659	-0.878	0.344	0.588
开花—乳熟	0.927^**	0.656^*	0.502	0.55^*	-0.686^**
孕穗中期—乳熟	0.927^**	0.744^**	0.407	0.715^**	-0.748^**

干旱类型	∆叶片含水率/%	∆叶水势/MPa		∆SPAD			∆P_n /[μmol/(m²·s)]	∆g_s /[mol/(m²·s)]	∆T_r /[μmol/(m²·s)]	∆C_i /(μmol/mol)
干旱类型	∆叶片含水率/%	7:00	11:00	倒1叶	倒2叶	倒3叶	∆P_n /[μmol/(m²·s)]	∆g_s /[mol/(m²·s)]	∆T_r /[μmol/(m²·s)]	∆C_i /(μmol/mol)
孕穗期干旱	-0.782^**	-0.81^**	-0.644^*	-0.824^**	-0.745^**	-0.733^**	-0.636^*	-0.599^*	-0.648*	0.758^**
开花期干旱	0.965^**	0.133	0.714^**	0.331	0.032	0.459	-0.132	-0.202	0.465	-0.486

干旱类型	∆叶片含水率/%	∆叶水势/MPa		∆SPAD			∆P_n /[μmol/(m²·s)]	∆g_s /[mol/(m²·s)]	∆T_r /[μmol/(m²·s)]	∆C_i /(μmol/mol)
干旱类型	∆叶片含水率/%	7:00	11:00	倒1叶	倒2叶	倒3叶	∆P_n /[μmol/(m²·s)]	∆g_s /[mol/(m²·s)]	∆T_r /[μmol/(m²·s)]	∆C_i /(μmol/mol)
孕穗期干旱	-0.782^**	-0.81^**	-0.644^*	-0.824^**	-0.745^**	-0.733^**	-0.636^*	-0.599^*	-0.648*	0.758^**
开花期干旱	0.965^**	0.133	0.714^**	0.331	0.032	0.459	-0.132	-0.202	0.465	-0.486