The aim of this study was to investigate the physiological responses of Schima superba seedlings to natural drying conditions,to provide a scientific basis for their cultivation.We used a natural drying method to examine the effects of varying water gradi-ents on the physiological indices of S.superba seedling leaves.Preliminary experiments were conducted to assess the growth of S.superba seedlings under natural drying conditions.Samples were collected every three days to measure chlorophyll(Chl),malondialdehyde(MDA),soluble protein(SP),catalase(CAT),peroxidase(POD),and superoxide dis-mutase(SOD)activities at different drought treatment times(CK:0th day,P1:3rd day,P2:7th day,P3:11th day,P4:15th day).A comprehensive evaluation of six physiological indices was conducted,and the results indicated that,as the severity of drought increased,the Chl content gradually decreased,whereas the MDA content and CAT enzyme activity generally showed an up-ward trend.POD and SOD enzyme activities initially increased and then decreased,and SP content exhibited an initial decreas-ing trend,followed by an increase.The principal component and correlation analyses revealed that Chl,MDA,POD,and SOD had higher scores and significant intercorrelations.The comprehensive drought resistance response function Y value showed an initial increase,followed by a decrease with increasing drought stress,reaching a minimum on the third day and a maximum on the eleventh day.Notably,S.superba seedlings exhibit a strong adaptive capacity in the early stages under drought condi-tions,but their adaptability diminishes as drought stress persists.
维普
万方数据
