冬枣×临猗梨枣杂交后代的抗寒性和抗寒单株的筛选

Cold hardiness of Dongzao×Linyilizao seedlings and the selection of cold-hardiness candidates

为了解枣树抗寒性的遗传变异规律,寻找优良的抗寒资源,为枣树生产服务,采用电导法,在不同时期对冬枣×临猗梨枣杂交后代及其父母本枝条进行抗寒性研究,结果显示:深冬(12月底)枣树枝条的抗寒性强于萌芽前期(3月中旬),同一时期杂交后代枝条的抗寒性强于母本冬枣、父本临猗梨枣。抗寒性在杂交群体中存在很大变异,在不同时期、不同处理温度下各级次的个体数均呈正态分布,表明杂交后代的抗寒性为受多基因控制的数量性状。初步筛选出10株抗寒有益单株,以供进一步选育。

The production of Chinese jujube was greatly damaged by cold injury in recent years. This research was carried out in order to find out the heredity and variation rules of cold-hardiness of jujube and find out the excellent cold hardiness candidates in jujube. In this thesis, cold hardiness of Dongzao crossed with Linyilizao cultivars and their hybrid seedlings at different growing period was measured by conductance. The results are as follows： cold hardiness of the branches is stronger in deep winter （end of December） than the one before germination time （middle of March） and that of the seedlings is stronger than their parents at the same time. Cold hardiness of the seedlings present a drastic variation among the population and form a normal distribution at different time and different treatment - temperature, which show that cold hardiness of the seedlings is a multi - gene controlled quantitative characteristics. 10 useful cold hardiness candidates were selected for future research.