Effect of Drought Stress on the Growth,Physiological and Biochemical Characteristies of Ulmus lamellosa seedlings
Using one-year-old Ulmus lamellosa seedlings as the research object,a pot cultivation method was used to control water content,and four treatment levels of soil moisture content were set at 80%(control),60%(mild drought stress),40%(moderate drought stress),and 20%(severe drought stress)of the field capacity,to study the effects of drought stress on the growth and physiological and biochemical characteristics of Ulmus lamellosa seed-lings.The results showed that with the increase in drought stress intensity,the plant height and underground biomass of the seedlings gradually decreased,while the aboveground biomass,total biomass,catalase(CAT)activity,and proline(Pro)content showed a trend of first increasing and then decreasing.Superoxide dismutase(SOD)and per-oxidase(POD)first decreased and then increased,and then decreased again.The soluble protein content and malo-ndialdehyde(MDA)content showed a trend of first decreasing and then increasing.Under mild drought stress,the aboveground biomass and total biomass of seedlings were the highest.There was a certain correlation between the growth indicators and between growth and physiological indicators of seedlings.The study showed that under differ-ent drought stress conditions,the growth of Ulmus lamellosa seedlings was inhibited to a certain extent,but they could resist drought stress by regulating their own physiological metabolism,and mild drought stress was a suitable soil moisture condition for the growth of Ulmus lamellosa seedlings.
Ulmus lamellosaseedlingsdrought stressgrowth indexesphysiological index
万方数据
维普
