| 摘要: |
| 【 目的】明确梭梭、白刺、沙蒿3种荒漠植物的光合与生理协同抗旱机制，建立多指标协同的耐旱性评 价体系。【 方法】以3种植物盆栽实生苗为对象，通过自然干旱处理构建梯度干旱胁迫，测定叶片叶绿素含量、叶绿素 荧光参数及相对含水量、细胞膜透性、渗透调节物质含量、抗氧化酶活性，结合相关性分析揭示指标协同变化规律。 【结果】在干旱胁迫下，3种植物叶片光合与生理指标均呈规律性变化：梭梭叶片相对含水量降幅最小、丙二醛积累量 最少，叶绿素荧光参数（Fv/Fm、NPQ）稳定性最优；白刺通过早期激活过氧化氢酶（CAT）与脯氨酸积累响应胁迫，光合 效率与CAT协同性突出；沙蒿各项指标波动最显著，光合参数与过氧化物酶（POD）活性呈负相关。相关性分析结果 显示，梭梭叶片光合指标与渗透调节物质含量、抗氧化酶活性呈极显著正相关，白刺光合效率与CAT协同性突出，沙蒿光合参数与POD活性呈负相关，3种植物光合与生理协同模式存在本质差异。【 结论】梭梭通过光合系统与渗透调 节、抗氧化系统的强协同性维持耐旱优势，耐旱能力最优；白刺依赖光合与过氧化氢酶的协同适配过渡区环境，耐旱能力次之；沙蒿协同调控能力较弱。梭梭、白刺、沙蒿3种植物的耐旱性及其光合生理协同调控能力的差异，与其自然分布的水分梯度特征高度适配。 |
| 关键词: 荒漠植物 干旱胁迫 生理响应 耐旱能力 |
| DOI：10. 13207/j. jnwafu. 2026. 09. 015 |
| 分类号: |
| 基金项目:甘肃省第二批陇原青年英才项目（2023-11）；甘肃省林业和草原科技创新项目（LCCX202404）；中国工程院战略研究与咨询 项目（2024-DFZD-32）；国家自然科学基金项目（U22A20452） |
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| Synergistic changes and drought tolerance assessment of photosynthetic systems and physiological indicators of three desert plants under drought stress |
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HU Xiaoke1,2, WANG Fanglin1,2, HE Fangyin1,2, WANG Yuqi1, CHAI Chengwu1, ZHAO Peng1
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1.Gansu Desert Control Research Institiute，Lanzhou，Gansu 730070，China;2.Gansu Provincial Key Laboratory of Desertification Prevention and Control，Wuwei，Gansu 733000，China
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| Abstract: |
| 【 Objective】This study aims to clarify the synergistic drought-resistance mechanisms of photo-synthesis and physiology in three typical desert plants（Haloxylon ammodendron，Nitraria tangutorum and Artemisia desertorum），and establish a comprehensive drought tolerance evaluation system based on multi-index synergy.【Method】Potted seedlings of the three species were treated with a gradient of natural drought stress. A range of photosynthetic and physiological indicators was measured，including leaf chlorophyll content，chloro?phyll fluorescence parameters，leaf relative water content（RWC），cell membrane permeability，contents of osmotic adjustment substances，and activities of antioxidant enzymes. Correlation analysis was performed to reveal the coordination patterns among these indicators.【Result】Under drought stress，both photosynthetic and physi-ological indicators of the three species exhibited regular changes. The relative water content of H.ammodendron leaves showed the smallest decrease，with the least accumulation of malondialdehyde and the best stability of chlorophyll fluorescence parameters（Fv/Fm，NPQ）.N.tangutorum responded to stress by early activation of catalase（CAT） and accumulation of proline，demonstrating outstanding synergy between photosynthetic efficiency and CAT activity. A.desertorum exhibited the most significant fluctuations in various indicators，with a negative correlation between photosynthetic parameters and peroxidase （POD） activity.Correlation analysis showed that the photosynthetic indicators of H.ammodendron leaves were highly significantly positively correlated with the content of osmoregulatory substances and antioxidant enzyme activities. The photosynthetic efficiency of N. tangutorum was highly synergistic with CAT activity，while the photosynthetic parameters of A.desertorum were negatively correlated with POD activity.Fundamental differences existed in the synergistic modes of photosynthesis and physiology among the three plant species.【Conclusion】H.ammodendron maintains its superior drought tolerance through strong synergy among its photosynthetic system，osmotic regulation，and antioxidant system.N.tangutorum，relies on the synergistic adaptation of photosynthesis and catalase activity
to the transitional zone environment，ranking second in drought tolerance.A.desertorum exhibits relatively weak synergistic regulation ability. The differences in drought tolerance and photosynthetic physiological coregulation
capabilities among H.ammodendron，N.tangutorum，and A.desertorum are highly consistent with the characteristics of the water gradients in their natural distributions. |
| Key words: desert plants drought stress physiological response drought tolerance |
