Abstract:

double cross hybrid clones of white poplar,whose hybridization combination is (Populus tomentosa×Populus bolleana)×(Populus alba×Populus tremula),as the experimental materials,the growth and physiological characteristics under water stress were studied,index system on comprehensive judgement of drought resistance ability of the clones were suggested and the drought resistance ability of the clones were judged comprehensively.On this basis,the indices of adaptability to drought and of productivity to drought were analyzed.The plant height,single leaf area,net photosynthesis rate, transpiration,leaf water-losing rate and the ability of osmotic adjustment were suggested to be used as comprehensive judgment indexes in drought-resistance clones selection.

Key words: Double cross hybrid clones of white poplar, Drought resistance, Appraisal indices, Comprehensive judgment