Physiological Response Mechanism and Drought Resistance Evaluation of Passiflora edulis Sims under Drought Stress  

作　　者：Binyang Zhao Fengchan Wu Guojun Cai Peiyu Xi Yulin Guo Anding Li 

机构地区：[1]College of Forestry,Guizhou University,Guiyang,550025,China [2]Guizhou Institute of Biology,Guizhou Academy of Sciences,Guiyang,550009,China [3]College of Resources and Environment,Hunan Agricultural University,Changsha,410128,China

出　　处：《Phyton-International Journal of Experimental Botany》2024年第6期1345-1363,共19页国际实验植物学杂志（英文）

基　　金：supported jointly by the Science and Technology Project of Guizhou Province(Qian-Ke-He Platform Talents[2021]5624);the National Natural Science Foundation of China(31960576);Science and Technology Project of Guizhou Province(Qian-Ke-He Support[2021]General 228)were funded.

摘　　要：In order to explore the response mechanism of Passiflora edulis Sims to drought stress,the changes in morpho-logical and physiological traits of Passiflora edulis Sims under different drought conditions were studied.A total of 7 germplasm resources of Passiflora edulis Sims were selected and tested under drought stress by the pot culture method under 4 treatment levels:75%–80%(Control,CK)of maximumfield water capacity,55%–60%(Light Drought,LD)of maximumfield water capacity,i.e.,mild drought,40%–45%(Moderate Drought,MD)of max-imumfield water capacity,i.e.,moderate drought and 30%–35%(Severe Drought,SD)of maximumfield water capacity,i.e.,severe drought.On the 40th day of drought treatment,13 indices,including seedling growth mor-phology,physiology,and biochemistry,were measured.The results showed that under drought stress,the height and ground diameter of P.edulis Sims gradually decreased with increasing drought stress,and there were signifi-cant differences in seedling height and ground diameter among the treatments.Drought stress significantly inhib-ited the growth of seven P.edulis Sims varieties.The contents of soluble sugar(SS),soluble protein(SP),proline(Pro),and other substances in P.edulis Sims basically increased with increasing drought stress.With the aggrava-tion of drought stress,the malondialdehyde(MDA)content of P.edulis Sims tended to increase to different degrees,the superoxide dismutase(SOD)activity and peroxidase(POD)activity both tended to increase atfirst and then decrease,and the change in catalase(CAT)activity mostly showed a gradual increasing trend.The con-tents of endogenous hormones in P.edulis Sims significantly differed under different degrees of drought stress.With the aggravation of drought stress,the abscisic acid(ABA)content of P.edulis Sims tended to increase,whereas the contents of gibberellin(GA),indoleacetic acid(IAA),and zeatin nucleoside(ZR)exhibited a down-ward trend.A comprehensive evaluation of the drought resistance of seven P.edulis Sims varieties was co

关 键 词：Drought resistance water stress PHYTOHORMONE morphological trait physiological traits 

分 类 号：S667.9[农业科学—果树学]