不同生境种源盐地碱蓬幼苗生长发育对盐分胁迫的响应和适应

doi:10.11686/cyxb2015312

摘要/Abstract

摘要： 为探讨盐地碱蓬适应不同生境的生理机制,研究了不同盐分处理(0,200和400 mmol/L的NaCl;0,200和400 mmol/L的KCl)对盐碱地和潮间带两种种源盐地碱蓬的生长发育、植株离子积累、叶片光合荧光指标和植株抗氧化系统的影响。结果表明,与对照相比,200 mmol/L的NaCl处理使盐地碱蓬的地上部鲜重、干重、肉质化程度显著增加,400 mmol/L的NaCl处理和两种浓度的KCl处理使盐地碱蓬的鲜重、干重、肉质化程度显著降低。不同浓度的NaCl处理使盐地碱蓬地上部Na⁺和Cl^-含量显著增加,K⁺含量显著降低;不同浓度的KCl处理使盐地碱蓬地上部K⁺和Cl^-含量显著增加,Na⁺含量显著降低。200 mmol/L的NaCl处理对碱蓬叶片的净光合速率、光合放氧速率、F_v/F_m值和φPSⅡ值无明显影响,而KCl处理则使碱蓬叶片各光合荧光参数显著降低。低浓度(200 mmol/L)NaCl处理使碱蓬SOD活性显著增加,但高浓度(400 mmol/L)NaCl处理和两种浓度的KCl处理均使碱蓬SOD活性显著降低。两种离子的不同浓度处理均使碱蓬POD活性显著增加。潮间带种源盐地碱蓬的地上部鲜重、干重、肉质化程度、光合荧光参数、地上部离子含量(Na⁺和Cl^-)均显著低于盐碱地生境。钾盐对盐地碱蓬的胁迫效应显著大于钠盐。盐碱地生境种源盐地碱蓬对盐分胁迫的响应显著高于潮间带。

Abstract: The influence of salt (0, 200 and 400 mmol/L NaCl; 0, 200 and 400 mmol/L KCl) on growth, ion accumulation, chlorophyll fluorescence and gas exchange in leaves and antioxidant levels was assessed in Suaeda salsa plants from different habitats; intertidal and inland saline. 200 mmol/L NaCl significantly increased shoot fresh weight and dry weight and succulence of S. salsa plants, while 400 mmol/L NaCl and all KCl treatments resulted in reduced growth. The concentrations of Na⁺ and Cl^- were increased by NaCl treatments while the concentration of K⁺ significantly decreased. Similarly KCl treatments resulted in increasing K⁺ and Cl^- concentrations accompanied by a marked reduction in Na⁺ concentration. The 200 mmol/L NaCl treatment had no effect on net photosynthesis, photosynthetic oxygen evolution rate, F_v/F_m and φPSⅡin S. salsa, but KCl treatments resulted in a significant decrease in these traits. In addition, 200 mmol/L NaCl resulted in a significant increase in the SOD activity whereas 400 mmol/L NaCl and all KCl treatments markedly decreased SOD activity. Interestingly, the POD activity in S. salsa was significantly increased by all NaCl and KCl treatments. Shoot fresh weight and dry weight, succulence, net photosynthesis, photosynthetic oxygen evolution rate and ion concentration (Na⁺ and Cl^-) of S. salsa plants from the intertidal zone were lower than that those from an inland saline areas. The salt stress effect of KCl was greater than that of NaCl. Saline stress in S. salsa plants from saline inland habitats was significantly greater than plants from an intertidal zone.

彭斌, 许伟, 邵荣, 封功能, 石文艳. 不同生境种源盐地碱蓬幼苗生长发育对盐分胁迫的响应和适应[J]. 草业学报, 2016, 25(4): 81-90.

PENG Bin, XU Wei, SHAO Rong, FENG Gong-Neng, SHI Wen-Yan. Growth of Suaeda salsa tin response to salt stress in different habitats[J]. Acta Prataculturae Sinica, 2016, 25(4): 81-90.

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