分别用不同浓度的水杨酸（ SA）和氯化钙（ CaCl2）处理番茄品种东农11537幼苗，处理3 d后进行干旱胁迫，在干旱的第1、3、5和7天观察植株表型，测定叶片相关生理指标，并比较2种处理的抗旱效果、最佳抗旱浓度。结果表明，干旱胁迫下，与喷施去离子水的对照组相比，适宜浓度的SA和CaCl2处理均能有效缓解番茄叶片相对含水量的降低，抑制相对电导率和丙二醛含量的增加，同时，提高番茄叶片SPAD值、脯氨酸和可溶性蛋白的含量，提高超氧化物歧化酶、过氧化氢酶、过氧化物酶的活性，有效提高番茄幼苗的抗旱性。0�3 mmol·L－1的SA和10 mmol·L－1的CaCl2处理提高番茄幼苗抗旱性的效果较佳，0�3 mmol·L－1 SA效果最佳。%Dongnong 11537 tomato seedlings were applied exogenously with different concentrations of salicylic acid ( SA) and calcium chloride ( CaCl2 ) for 3 d and then treated by drought stress. Plant phenotypes were observed and physiological characteristics were investigated, effects of SA and CaCl2 upon drought stress were compared and the optimal concentrations of SA and CaCl2 were screened. The results showed that compared with control group, under drought stress, appropriate application of SA and CaCl2 could effectively slow down the reduction of relative water content of tomato leaves, suppress the increase of relative conductance rate and malondialdehyde content, increase SPAD value, contents of proline and soluble protein, stimulate the activities of superoxide dismutase, catalase and peroxidase, indicating that appropriate application of SA and CaCl2 could effectively improve drought resistance of to⁃mato seedlings. 0�3 mmol·L-1 SA and 10 mmol·L-1 CaCl2 had the optimal effect for improving drought tolerance of tomato seedlings. To summarize, the effect of 0�3 mmol·L-1 SA was more prominent.
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