NaCl胁迫对胡卢巴幼苗光合生理特性的影响

摘要

The effects of NaCl stress (0, 0.2%, 0.5%and 1.0%) on photosynthetic and physiologi-cal properties of Trigonella foenum-graecum L. were investigated. The results indicated that as the NaCl concentration increasing, the net photosynthetic rate, transpiration rate and stomatal conductance decreased gradually; the intercellular CO2 concentration decreased at first, and then increased when seedlings were treated with 1.0% NaCl concentration; the chlorophyll contents showed an increasing-decreasing trend, and got the peak when NaCl concentration was 0.5%;and chlorophyll a/b showed an increasing trend. The damage degree of cell membrane was low with 0.2% NaCl treatment, and then increased significantly when NaCl concentration was 0.5%, however, it kept below 8.0%when the NaCl concentration was up to 1.0%.%　　以胡卢巴幼苗为试验材料，分别选用浓度0、0.2%、0.5%和1.0%NaCl的Hoagland营养液对胡卢巴幼苗进行盐胁迫处理，探讨不同浓度NaCl胁迫对胡卢巴幼苗光合生理特性的影响。结果表明，随着NaCl浓度增加，胡卢巴幼苗叶片净光合速率（Pn）、蒸腾速率（Tr）和气孔导度（Gs）均呈降低趋势；胞间CO2（Ci）浓度先降低，随后在1.0%NaCl浓度胁迫下有所增加；叶绿素含量呈先升高后降低的趋势，在0.5%NaCl浓度胁迫下达到最大值；而叶绿素a/b比值则一直呈增加趋势。叶片细胞膜伤害度在0.2%NaCl浓度胁迫下较低，当NaCl浓度升至0.5%时显著增加，但在1.0%NaCl浓度胁迫下仍维持在小于8.0%的水平。