中国草地学报2025，Vol.47Issue(9)：26-36,11.DOI:10.16742/j.zgcdxb.20240486
盐胁迫对鹰嘴紫云英幼苗光合特性及糖代谢的影响
Effects of Salt Stress on Photosynthetic Characteristics and Sugar Metabolism of Astragalus cicer Seedlings
摘要
Abstract
This study aimed to explore the impacts of salt stress on the photosynthetic characteristics and sugar metabolism of Astragalus cicer seedlings.A.cicer cultivar'Gan Green No.2'was treated by 120 mmol/L NaCl solution as salt stress simulation.Sampling was conducted at 0,1,3,5,7,14,and 21 days after stress applied for relevant indices measurement.The results indicated that salt stress induced stomatal closure in the leaves of A.cicer seedlings resulting in reduced stomatal conductance reduction and impairment of the photosynthetic system.Simultane-ously,the chlorophyll content,net photosynthesis rate,transpiration rate,actual photochemical efficiency,apparent photosynthetic electron transport rate(ETR),and photochemical quenching coefficient were significantly decreased.However,the contents of sucrose,fructose,and glucose exhibited trends of increasing initially followed by declining.Moreover,the intercellular CO2 concentration,non-photochemical quenching coefficient(NPQ),starch content,sucrose synthase(SS)activity,and activities of soluble acid invertase(SAI)and neutral invertase(NI)increased and eventually stabilized with treatment time prolonged.In contrast,the sucrose phosphate synthase activity(SPS)gradu-ally exhibited a decreasing trend.Correlation analysis demonstrated that soluble sugars content were closely related to photosynthetic parameters,suggesting that sugars may play a crucial role in regulating of photosynthesis and plant light use efficiency.Starch content was positively correlated with NPQ,indicating that starch may be involved in regulating photoprotection and energy dissipation.In conclusion,salt stress tolerance of A.cicer seedlings can be enhanced by regulating sugar metabolism-related enzyme activities and photosynthetic system,leading to increased soluble sugar and NPQ levels.The findings of this study provide valuable insights into the growth and physiological mechanisms of A.cicer in saline-alkaline soils.关键词
鹰嘴紫云英/盐胁迫/光合特性/糖代谢/相关性分析Key words
Astragalus cicer/Salt stress/Photosynthetic characteristics/Sugar metabolism/Correla-tion analysis分类
农业科技引用本文复制引用
乃国栋,马福钦,张玉娟,宋承瑜,董文科..盐胁迫对鹰嘴紫云英幼苗光合特性及糖代谢的影响[J].中国草地学报,2025,47(9):26-36,11.基金项目
甘肃省自然科学基金重点项目(25JRRA806) （25JRRA806）
