Physiological response of Handroanthus impetiginosus to drought stress
To evaluate the drought resistance of Handroanthus impetiginosus.The water control test was carried out with Handroanthus impetiginosus as the material.After the test,the relative water content,relative chlorophyll content(SPAD),malondialdehyde(MDA)content,soluble sugar and proline(Pro)content and the activities of superoxide dismutase(SOD)and catalase(CAT)of the cultivated substrate were measured every 3 days to explore the physiological response of Handroanthus impetiginosus to drought stress.The results showed that,in the early stages of drought,the content of MDA increased,plant cell membranes were damaged,soluble sugars and Pro and other osmotic regulatory substances increased,and the activities of SOD and CAT increased,demonstrating a certain degree of drought resistance.After the relative moisture content of the cultivation substrate was below 33.71％,soluble sugars and Pro increased,but the activities of SOD and CAT gradually decreased from their peak,and MDA remained at a high level,indicating that Handroanthus impetiginosus may have reached its drought tolerance limit.These results indicated that Handroanthus impetiginosus could be tolerant to drought stress by osmotic regulation and activation of antioxidant enzyme activity at the early stage of drought stress.With the increase of stress degree,the drought tolerance reached the limit,and the activities of antioxidant enzymes SOD and CAT decreased,which inhibited the growth of Handroanthus impetiginosus.
NETL
NSTL
万方数据
