Responses Of Cercis Chinensis Bunge Seedlings To Drought, Salt And Their Intercross Stresses

The potted one-year-old seedlings of Cercis chinensis Bunge were tested to study their response to salt, drought and salt-drought intercross stress. In order to analyze the differences between salt, drought stresses and salt-drought stress and provide scientific and theoretic basis for selecting and breeding for superior varieties, the growth, physiological and biochemical, photosynthesis indexes of these seedlings were measured. The test results are as the followings:Through grading the injured symptom under different stresses, it was found that the highest grade under drought was 2, but under salt stress it was 4.The result showed that seedlings of Cercis chinensis Bunge was more sensitive to salt stress than drought stress. There were 6 kinds of treatments whose grade was reached 4, and it was accounted for 66.7% of all the treatments. The result showed that salt-drought intercross stress had made more adverses effect on the seedlings of Cercis chinensis Bunge than that of salt or drought stress.The membrane conductibility was increased as the enhancement of stresses intensity. After water recovering the membrane conductibility was decreased under salt-drought intercross stresses.The dynamic of SOD and CAT are same in basically the response to drought, but SOD was lagged to CAT. It was showed that these two kinds of enzyme have different response time. But they have the same response time under salt-drought intercross stress, so it may produce adaptation mechanism under salt-drought intercross stress.The sequence of content of Na~+ were root>stem>leaf under salt and salt-drought intercross stress. The content of K~+ did not have regular changes...