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利用电导法测定龙香×早酥等三个杂交组合杂种后代的抗寒性，通过生物统计学方法研究杂种后代电解质渗出率综合平均值R的分布规律．结果表明：梨抗寒性是多基因控制的数量性状，杂种后代趋中变异，平均抗寒水平介于双亲之间，但有超亲植株出现．
The cold resistance of hybrid progenies such as Longxiang × Shuxu was determined by conductivity method and the distribution law of the integrated average R of the electrolyte exudation rate of hybrid offspring was studied by biostatistics. The results showed that cold resistance of pears was a quantitative trait controlled by multiple genes, and the offspring of hybrids tended to vary. The average cold resistance level was between parents, but super-progeny plants appeared.