Abstract:

In order to screen the ground cover plants with strong drought resistance suitable for planting in Beijing,eight drought-resistance indices such as catalase(CAT),peroxidase(POD),superoxide dismutase(SOD)activity,malondialdehyde(MDA)molality,proline(Pro),soluble protein(SP),starch and soluble sugar(SS)mass fractions were determined by observing the overall growth and leaf damage of plants.The drought resistance of 9 ground cover plants,including Clematis heracleifolia,Potentilla chinensis,Nepeta cataria,Chrysanthemum lavandulifolium,Oplismenus undulatifolius,Chrysanthemum indicum,Viola philippica,Taraxacum mongolicum,Carex giraldiana,were comprehensively evaluated by subordinate function analysis,principal component analysis and cluster analysis.The results showed 1)During the period of drought stress treatment,POD activity,MDA content,soluble sugar,starch and Pro content increased,soluble protein content and SOD activity decreased initially before increasing,and CAT activity showed an initial increase followed by a subsequent decline.2)Combined with the overall growth of the plant and the damage of the leaves and the comprehensive evaluation results,among the nine species,Potentilla chinensis,Nepeta cataria and Taraxacum mongolicum had stronger drought resistance,and Clematis heracleifolia and Oplismenus undulatifolius had weaker drought resistance.Therefore,dandelion,Potentilla chinensis and Schizonepeta tenuifolia are suitable for promotion and application in Beijing,while water management t is essential for the cultivation of Clematis heracleifolia and Oplismenus undulatifolius are applied.

Key words: ground cover plants, drought stress, physiological response, membership function analysis, principal component analysis