【摘要】 外源钙可以加强某些植物对非生物胁迫的抗性。然而,钙对盐胁迫下忍冬的作用尚不清楚。该试验旨在研究外源钙对盐处理下忍冬的生物量、光合色素含量、气体交换参数和快速叶绿素荧光诱导动力学曲线产生的影响。实验选用一年生忍冬为研究材料,用4个水平盐浓度(0,50,100,150 mmol·L-1)和2个水平钙浓度(0,20 mmol·L-1)处理忍冬7 d,采用JIP-test参数,结合气体交换参数,分析外源钙是否可以提高盐胁迫下忍冬的抗性。结果显示,外源钙处理的忍冬比仅用盐处理的忍冬具有更好的光化学性能,代表了光合作用中心PSⅡ整体活性的PIABS,PItotal,表征电子传递效率的相关参数φP0,ψE0,φE0,σR,φR均显著提高。同时,气体交换参数Gs,Ci,Tr也保持在较高水平,与光合色素含量和生物量变化趋势一致。综上所述,外源钙保护了PSⅡ免于失活,促进了光合电子的传递,维持了较高的胞间CO2浓度,对盐胁迫下忍冬的生长起到了积极作用。更多还原

【Abstract】 Exogenous calcium can enhance the resistance of certain plants to abiotic stress. However,the role of calcium insaltstressed honeysuckle is unclear. The study is aimed to investigate the effects of exogenous calcium on the biomass,chlorophyll content,gas exchange parameters and chlorophyll fluorescence of honeysuckle under salt stress. The results showed that the calcium-treated honeysuckle had better photochemical properties than the salt-stressed honeysuckle,such as PIABS,PItotal,which represents the overall activity of photosystemⅡ(PSⅡ),and related parameters for characterizing electron transport efficiency φP0,ψE0,φE0,σR,and φR are significantly improved. At the same time,the gas exchange parameters Gs,Ci,Trare also maintained at a high level. In summary,exogenous calcium protects the activity of PSⅡ,promotes the transmission of photosynthetic electrons,and maintains a high Ci,therefore enhances the resistance of honeysuckle under salt stress.更多还原