Effects of water retaining agent on physiological characteristics of three Euonymus plants under drought stress
[Objective]To explore the effects of HRD water-retaining agent on the growth and physiology of three species of Euonymus fortunei under drought stress,and to provide theoretical basis for drought resistance of garden plants.[Method]E.fortunei(Turcz.)Hand.-Mazz,E.fortunei var.radicans,E.fortunei'Emerald Gold'were used as materials with four water-retaining agent gradients(the mass ratio of water-retaining agent and base material was 0.3%,0.6%,0.9%and 1.2%,respectively)and no water-retaining agent was used as control(CK).The response characteristics of growth morphological indexes(plant height and number of new shoots),photosynthetic physiology(total chlorophyll,chlorophyll a,chlorophyll b),water physiology(RWC,relative conductivity)and stress physiology(MDA,PRO,SP,SOD)of three plants under different water retention doses were studied.[Result]1)Under drought stress,the water-retaining agent significantly increased the plant height of three species of Euonymus by 6 cm,3.6 cm,3.6 cm,respectively,and the number of new buds was 5,7,4,and the survival time was prolonged for 10-20 days;2)Compared with CK,water-retaining agent significantly increased total chlorophyll content and chlorophyll a/b value.Different water-retaining agent contents had significant differences in total chlorophyll content and chlorophyll a/b value.High water-retaining dose was more effective than low water-retaining dose in improving total chlorophyll content and chlorophyll a/b value;3)Water-retaining agent significantly improved the relative conductivity and relative water content.Low water-retaining dose plants responded to drought stress first and the damage degree was relatively serious,while high water-retaining dose plants responded later and the degree was relatively light;4)Water-retaining agent significantly increased the content of MDA,soluble protein,soluble sugar,free proline and other osmotic substances,and significantly increased the activity of SOD;5)The principal components of different water-retaining doses showed that the water-retaining effect of Euonymus crawling and Euonymus Phnom Penh was the best when the water-retaining dosage was 0.6%,and the water-retaining effect of Euonymus crawling and Euonymus Phnom Penh were 0.9%.[Conclusion]Under drought stress,a certain concentration of water-retaining agent can promote the morphological growth of Euonymus,effectively improve the drought resistance of the three plants and prolong their survival time.
Euonymus fortuneiplantswater-retaining agentdrought stressphysiological index
万方数据
维普
