中文摘要：

为使红麻细胞质雄性不育系和保持系在华南地区安全越冬，实现多年生栽培，将不育系的繁殖固定于较低的回交世代，以抗寒性较强的红麻野生种H040、P3A×H040杂交种为砧木，P3A、P3B的实生苗为接穗，并以本砧嫁接为对照，探讨嫁接对红麻雄性不育系和保持系的生长发育及越冬抗寒性的效应。聚类和隶属函数分析结果显示：抗寒性强弱可划分为5类，红麻野生种H040和杂交组合P3A×H040抗寒性最强，为1级； P3A/P3A×H040和P3A/H040抗寒性较强，2级； P3A CK和P3A/P3B CK抗寒性中等，3级；P3B/P3A×H040和P3B/H040抗寒性较弱，4级； P3B/P3A和P3B CK抗寒性最弱，5级。以抗寒性较强的实生苗为砧木嫁接可提高红麻接穗的抗寒性。

英文摘要：

In order to let kenaf cytoplasmic male sterile（CMS）lines and maintainers in southern Chi- na live through the winter safely and to realize perennial cultivation, propagation of male sterile lines will be fixed in the lower backcross generation. Kenaf cytoplasmic male sterile（CMS） line P3A and its maintainer P3B were grafted on the kenaf wild species H040, hybrids P3AX H040, and its grating were used as controls. The results of cluster analysis and membership function showed that cold resistance may be divided into 5 categories, level 1, the most. kenaf wild species H040 and hybrids P3A X H040; level 2, strong.P3A/P3AX H040 and P3A/H040; level 3 medium： P3A CK and P3A/P3B; level 4, Less. P3B/ P3AX H040 and P3B/H040; level 5, the weakest. P3B/P3A and P3B CK. Main composition analysis showed that the first principal components were withered degree, soluble sugar content, conductivity, number of leaves; The second principal component was water content of stem. Kenaf scion cold resist- ance on grafted by strong seedling rootstocks was improved.