Effects of water retaining agent on growth and physiology of Trachelospermum jasminoides under drought stress
[Objective]This study clarified the suitable concentration of water retaining agent for the growth of Trachelospermum jasminoides,and provided a theoretical basis for the popularization and application of water retaining agent in T.jasminoides.[Method]Under natural drought stress,a pot experiment was conducted to study the effects of water retaining agent on the changes of morphological and physiological indexes of T.jasminoides under natural drought stress.One control(without water retaining agent)and four treatments(0.05%,0.10%,0.20%,0.40% )were set up according to the mass ratio of water retaining agent.The effects of water retaining agent on the morphological and physiological indexes of T.jasminoides were evaluated by correlation analysis and principal component analysis.[Result]After the application of different concentrations of water retaining agent,the performance of T.jasminoides was different in different periods.The difference of each index in the early stage was small,and the difference in the later stage was large.The index change time of the control group was earlier than that of the experimental group.After 35 days of drought stress treatment,the addition of water retaining agent delayed the withering and drying of T.jasminoides,and the average survival period,plant height growth and new leaf number were higher than those of CK.The relative water content,optimal/maximal photochemical efficiency of PS Ⅱ and photosynthetic electron transport efficiency showed a downward trend.The contents of chlorophyll and soluble protein showed a first decreasing and then increasing trend;the contents of MDA,SOD,solube sugar and initial fluorescence were increased.The results showed that the addition of water retaining agent had a positive effect on the morphology and physiological indexes of T.jasminoides.The correlation between the application of water retaining agent and the content of MDA,soluble protein content and solube sugar content of T.jasminoides was strong,and the order of ability from good to bad of each treatment and control to alleviate drought stress in the T.jasminoides was 0.20% water retaining agent,0.10% water retaining agent,0.05% water retaining agent,0.40% water retaining agent and CK.[Conclusion]A certain concentration of water retaining agent could delay the decline of T.jasminoides,improve the ability of water retaining and drought resistance,and reduce the damage of drought stress.And 0.20% water retaining agent can prolong the survival period of T.jasminoides for 18 days.
water retaining agentTrachelospermum jasminoidesdrought stressexternal morphologyphysiological indexoptimum concentration
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