摘要： 本文利用6个自交系按6×6不完全双列杂交组配的15个F₁为材料，对出苗率、出苗指数、电解质外渗量等11个与玉米苗期耐冷性有关的性状进行通径分析和遗传分析表明：在所有被测性状中，出苗率、出苗指数、幼苗鲜重、干物质增长量、组织活性对玉米幼苗耐冷性的影响是直接的，幼苗干重、种子百粒重、电解质外渗量对玉米苗期耐冷性的影响是间接的；出苗率、出苗指数、幼苗干重、干物质增长量四性状在遗传上主要受加性效应影响。根据以上结果提出，上列性状都应作为玉米耐冷性育种的改良目标。

关键词: 玉米苗期, 耐冷性状, 遗传力

Abstract: In this research,the path analysis and hereditary analysis for eleven characters excluding emergence rate,emergence index,electralyte leakage etc.,which have relations with the chilling tolerance of maize seedlings were done using fifteen F1 of combinations of six maize inbred lines in 6×6 uncom-plete diallel crossing.The results indicated that:of all the assayed characters,emergence rate,emergence index,the fresh weight of seedlings and dry material growth had direct effects and the dry weight of seedlings,the weight of hundred seeds,electralyte leakage and tissue activity had indirect eggects on the chilling tolerance of maize seedlings.In heredity,the four characters,emergence rate,emergence index seedlings dry weight and dry materia’;rowth,were mainly affected by additive effect;According to the above results,we advanced that all the above characters should be taken as improving targets of chilling tolerance breeding in maize.

Key words: Maize seedlings, Chilling tolerance character Hereditary capacity