CaCl对盐胁迫下小白菜生长和相关生理特性的影响

采用CaCl2根际注射结合叶面喷施的方法，研究了不同浓度（0、5、10、20、30 mmol/L ）CaCl2对盐胁迫下小白菜（Brassica campestris ssp. chinensis L.）幼苗生长及其生理生化特性的影响。结果显示，10 mmol/L CaCl2处理显著提高了幼苗的株高、单株干重、单株鲜重和展开叶片数等，降低了叶片丙二醛（MDA）含量，增强了叶片超氧化物歧化酶（SOD）、过氧化物酶（POD）等保护酶活性，显著提高盐胁迫下小白菜叶片的光合色素含量、净光合速率等。表明适宜浓度的外

Effects of CaCl2 on the Growth and the Mechanism in Brassica campestris ssp. chinensis L. under the Salt Stress

The effects of different concentrations(0,5,10,20,30 mmol/L)of CaCl2 on the growth,physiological and biochemical characteristics of pakchoi(Brassica campestris ssp.chinensis L.)under salt stress were studied by the methods of root injection and foliar spray with CaCl2.The results showed that 10 mmol/L CaCl2 significantly increased the plant height,plant dry weight,fresh weight,water content and the number of expanding leaves,decreased the malondialdehyde(MDA)content,enhanced the leaf superoxide dismutase(SOD),peroxidase(POD) enzyme activities,and significantly increased the photosynthetic pigment content and net photosynthetic rate of pakchoi leaves under the salt stress.The above analysis showed that the suitable concentration of exogenous calcium could ease the damage of NaCl stress on pakchoi by enchacing the capacity of osmotic adjustment,antioxidant capacity,protecting the structure and function of membrane,enhancing photosynthesis.