The research team from Gansu Agricultural University《Forests》Publish research findings（Haixia HuangWait, wait,2023In [year], the system explored the effects of simulated rainfall changes on the remains of bare fruit trees（Gymnocarpos）The influence of photosynthetic characteristics and antioxidant system. In this study, the application of the Yiketai photosynthetic phenotype measurement scheme provided key technical support for accurately analyzing the adaptation strategies of desert plants to precipitation changes.

As a remnant species of the Tertiary period, naked fruit trees are mainly distributed in the desert areas of northwest China and play an important role in maintaining the ecological balance of the desert. With the intensification of climate change, the precipitation pattern in the arid northwest region fluctuates significantly. Clarifying the water adaptation mechanism of this species is crucial for ecological protection.

Research setting 5 Rainfall gradient (baseline value)±15%、±30%Using the Yiketai photosynthetic phenotype scheme, the net photosynthetic rate, transpiration rate, and other gas exchange parameters of bare fruit tree seedlings were measured, and core indicators such as apparent quantum efficiency and photosynthetic rate were obtained through light response curve analysis. The results showed that an increase in rainfall significantly increased the net photosynthetic rate and transpiration rate of bare fruit trees, while a decrease in rainfall was limited by stomata15%）And non stomatal restriction (reduced)30%）As a result, the instantaneous water use efficiency of the leaves was significantly improved.

The chlorophyll fluorescence imaging system in the Yiketai photosynthetic phenotype scheme accurately captures the effects of rainfall changesNaked fruit woodOptical systemII（PSII）The impact of functionality. The data shows that reduced rainfall leads to a decrease in chlorophyll content,PSIIThe decrease in photochemical efficiency and steady-state optical quantum efficiency leads to significant photo suppression; The increase in rainfall significantly improved these fluorescence parameters. Through correlation analysis, a significant correlation was observed between fluorescence parameters and photosynthetic parameters, confirming the direct regulatory effect of moisture conditions on the function of photosynthetic mechanisms.

In addition, there has been a decrease in rainfall30%At that time, a large amount of superoxide anions and hydrogen peroxide accumulated in the leaves of naked fruit trees, causing membrane lipid peroxidation damage; And the activities of superoxide dismutase, peroxidase, and catalase are simultaneously enhanced, synergistically clearing reactive oxygen species and alleviating damage to the photosynthetic apparatus. The revelation of this antioxidant defense mechanism provides important evidence for understanding the drought resistance strategies of desert plants.

The collaborative application of photosynthesis analyzer and chlorophyll fluorescence imaging has achieved monitoring and analysis of the internal functions of photosynthesis mechanism from gas exchange, providing a reliable technical means for quantifying the impact of rainfall changes on plant physiological characteristics. This research not only elucidates the adaptation mechanism of bare fruit trees to precipitation changes, but also provides scientific support for the protection of desert plant resources and ecosystem restoration in the arid northwest region.

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