Mechanisms of Na+ transport and compensatory physiological adaptations in Salix matsudana cuttings under vertical salinity heterogeneity

文献类型： 外文期刊

第一作者： Zhao, Wenhao

作者： Zhao, Wenhao;Zhang, Minghui;Meng, Qingrui;Li, Hongjiao;Qiao, Shenqi;Guo, Jinyu;Pan, Menghan;Liu, Chaoran;Liu, Bingxiang;Guo, Yanchao;Liu, Bingxiang

作者机构：

关键词： Salt tolerance threshold; Compensatory growth; Photosynthetic parameters; Root activity; Visualization of Na plus translocation

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：5.7； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2025 年 225 卷

页码：

收录情况： SCI

摘要： Soil salinization is a major abiotic stress factor that limits global agricultural sustainability. In natural environments, salinity typically exhibits spatial heterogeneity, with both vertical and horizontal variations coexisting. However, most existing studies have primarily focused on horizontally heterogeneous salt stress, while the physiological mechanisms underlying plant responses to vertically heterogeneous salinity remain poorly understood. In this study, Salix matsudana Koidz was used as the model species, and a vertically split-root system was established to simulate vertically heterogeneous soil salinity. This system enabled a comprehensive investigation of the physiological responses of Salix cuttings under such stress. The results demonstrated that compensatory root growth in the low-salinity zone significantly alleviated the inhibitory effects of salt stress on Salix matsudana. A quantitative model linking root Na+ concentration with root activity was established, revealing that the salt tolerance thresholds for the upper and lower root zones were 20.78 mg/g and 18.27 mg/g, respectively. Photosynthetic physiological analyses indicated a significant negative correlation between root Na+ concentration in the low-salinity zone and the net photosynthetic rate (Pn), stomatal conductance (Gs), and transpiration rate (Tr) (R2 >= 0.79), while intercellular CO2 concentration (Ci) exhibited a significant positive correlation with Na+ concentration in the high-salinity zone (R2 = 0.62). Additionally, micro-area X-ray fluorescence imaging provided direct evidence of active Na+ transport from the high-salinity to the low-salinity zone. This study elucidates the physiological mechanisms by which Salix matsudana adapts to vertically heterogeneous salt stress through root-zone partitioning, selective ion uptake, and translocation. These findings offer significant theoretical insights and practical guidance for vegetation restoration in saline-alkaline lands.

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