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以白扬双杂交杂种新无性系为主要试验材料，在４种水分胁迫条件下对各无性系生理和生长指标进行了数量遗传分析。结果表明，各生长指标的遗传变异系数、互作变异系数、重复力和互作力一般均大于生理指标；绝大部分指标的重复力和遗传变异系数大于互作力和互作变异系数。以６个生理指标及２个叶部生长指标与苗高进行逐步回归分析表明，在不同水分胁迫条件下，影响苗高生长的主导因素不同。回归方程反映出，在受到土壤干旱胁迫时，在降低蒸腾作用的条件下，光合作用和光合面积越大，越有利于苗木生长，通过对苗高和生物量与水分互作分析及品种稳定性分析，根据生产力、适应性和稳定性指标可将１０个参试无性系分为３类
Using Baiyin two-hybrid hybrid clones as the main experimental materials, the quantitative genetic analysis of physiological and growth indexes of clones under four water stress conditions was carried out. The results showed that the genetic variation coefficient, interaction coefficient of variation, repetitive force and interaction force of each growth index were generally higher than those of physiological index. The repeatability and genetic variation coefficients of most of the indexes were larger than those of interaction and interaction. The stepwise regression analysis of six physiological indexes and two leaf growth indexes and seedling height showed that under the different water stress conditions, the main factors affecting the growth of seedling height were different. The regression equation reflects that under the condition of decreasing soil transpiration, photosynthesis and photosynthetic area are more conducive to the growth of seedlings under soil drought stress. Through the analysis of seedling height, biomass and water interactions and the stability of varieties According to the analysis of productivity, adaptability and stability index 10 clones can be divided into three categories