Alhagi sparsifolia acclimatizes to saline stress by regulating its osmotic, antioxidant, and nitrogen assimilation potential

作者：Abd Ullah, Akash Tariq, Jordi Sardans, Josep Peñuelas, Fanjiang Zeng, Corina Graciano, Muhammad Ahsan Asghar, Ali Raza, You‐Cai Xiong, Xutian Chai, Zhihao Zhang · 发表于：BMC Plant Biology · 年份：2022 · DOI：10.1186/s12870-022-03832-1 · 被引用次数：33 · 研究领域：Plant Stress Responses and Tolerance、Plant responses to water stress、Plant nutrient uptake and metabolism

Abstract Background Alhagi sparsifolia (Camelthorn) is a leguminous shrub species that dominates the Taklimakan desert’s salty, hyperarid, and infertile landscapes in northwest China. Although this plant can colonize and spread in very saline soils, how it adapts to saline stress in the seedling stage remains unclear so a pot-based experiment was carried out to evaluate the effects of four different saline stress levels (0, 50, 150, and 300 mM) on the morphological and physio-biochemical responses in A. sparsifolia seedlings. Results Our results revealed that N-fixing A. sparsifolia has a variety of physio-biochemical anti-saline stress acclimations, including osmotic adjustments, enzymatic mechanisms, and the allocation of metabolic resources. Shoot–root growth and chlorophyll pigments significantly decreased under intermediate and high saline stress. Additionally, increasing levels of saline stress significantly increased Na + but decreased K + concentrations in roots and leaves, resulting in a decreased K + /Na + ratio and leaves accumulated more Na + and K + ions than roots, highlighting their ability to increase cellular osmolarity, favouring water fluxes from soil to leaves. Salt-induced higher lipid peroxidation significantly triggered antioxidant enzymes, both for mass-scavenging (catalase) and cytosolic fine-regulation (superoxide dismutase and peroxidase) of H 2 O 2 . Nitrate reductase and glutamine synthetase/glutamate synthase also increased at low and intermediat...