Yang Fang, Lv Guanghui, Qie Yadong
School of Ecology and Environment, Xinjiang University, Urumqi 830046, Xinjiang, China.
Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi 830046, China.
AoB Plants. 2022 Sep 15;14(5):plac042. doi: 10.1093/aobpla/plac042. eCollection 2022 Oct.
Drought and salt stress are important abiotic stressors that adversely affect the growth, resistance and survival of plants. is a strong halophyte, and its hydraulic characteristics and carbon metabolism response to drought and salt stress under natural conditions have not been widely studied. With as the research object, three sample plots with different water and salt contents (high water and high salt, medium salt in reclaimed water, low water and low salt) were selected to determine their water physiology, photosynthetic physiology, carbon physiology and growth status under different water and salt conditions. Studies have shown that drought and salinity affect the hydraulic properties of , reducing the water content and water potential of assimilation branches and secondary branches and increasing the hydraulic conductivity per unit cross-sectional area of biennial shoots. Affected by drought, the content of non-structural carbohydrates (NSCs) in assimilation branches and secondary branches was significantly reduced, and the NSC content of assimilating branches was significantly higher than that in secondary branches. The transportation of NSCs to the secondary branches caused obstacles, and more accumulated in the assimilating branches. In addition, drought reduced photosynthesis and carbon assimilation and limited carbon uptake, resulting in slower growth. Under the influence of drought and salinity, the anisohydric properties of weakened its stomatal regulation ability and made it susceptible to water transport obstacles, but the degree of carbon limitation was relatively small.
干旱和盐胁迫是重要的非生物胁迫因素，会对植物的生长、抗性和存活产生不利影响。[植物名称]是一种强盐生植物，其在自然条件下对干旱和盐胁迫的水力特性及碳代谢响应尚未得到广泛研究。以[植物名称]为研究对象，选取了三个具有不同水盐含量的样地（高水高盐、再生水中等盐度、低水低盐），以测定其在不同水盐条件下的水分生理、光合生理、碳生理及生长状况。研究表明，干旱和盐度会影响[植物名称]的水力特性，降低同化枝和二级枝的含水量及水势，并增加二年生枝条单位横截面积的导水率。受干旱影响，同化枝和二级枝中非结构性碳水化合物（NSCs）的含量显著降低，且同化枝中的NSC含量显著高于二级枝。NSCs向二级枝的运输产生障碍，更多地积累在同化枝中。此外，干旱降低了[植物名称]的光合作用和碳同化，限制了碳吸收，导致生长减缓。在干旱和盐胁迫的影响下，[植物名称]的非等水特性削弱了其气孔调节能力，使其易受水分运输障碍的影响，但碳限制程度相对较小。
