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本试验测定了１９７５年春定植的４６９株温州蜜柑（尾张）（Ｃｉｔｒｕｓ ｕｎ－ｓｈｉｕ Ｍａｒｃ．）实生树经－９℃人工低温处理后的叶细胞电解质外渗率，并对其中３４７株的抗寒性进行了初步分析鉴定。测定结果表明，珠心后代和似橙、桔为父本的天然杂种（Ⅱ类）与母本的平均抗寒能力无显著差异，而似柚为父本的天然杂种（Ｉ类）则显著低于母本和其它两类卖生后代；实生后代抗寒性的变异幅度均较大，但天然杂种比珠心后代为大；在珠心后代和Ⅱ类天然杂种中各初选出一株比母本更抗寒的单株，其树体性状似尾张，树势强健，但果实某些性状存在不同程度的缺点；同时，还初选出５４株较母本抗寒的单株，其中Ｕ７０４０１珠心树品质优良，已连续四年当选为优株；另外，Ｕ７０４４２珠心树，抗寒性与初选抗寒单株很接近，品质优良，已连续三年当选；抗寒单株的初选入选率，珠心后代和Ⅱ类天然杂种间无显著差异，但都极显著高于Ｉ类天然杂种；播种前对种子进行了辐射处理的１０９株实生树的抗寒性与辐射处理之间看不出显著相关性。
In this experiment, the leaf electrolyte extravasation rate of 469 Citrus un-shiu Marc. Trees planted in spring in 1975 after artificial low temperature treatment at -9 ℃ was measured. Sex conducted a preliminary analysis identified. The results showed that there was no significant difference in the average cold tolerance of the offspring and the natural hybrids between the male offspring of pearl kernel and orange (P <0.05), and the female parent (P <0.05), while the natural hybrid In the offspring of the male parent and other two types of offspring, the variations of cold resistance in the offspring of the offspring were larger, but the natural hybrids were larger than the offspring of the pear offspring. The more cold-tolerant parent plants, the tree traits like Tail Zhang, strong tree vigor, but some of the traits of fruit there are different degrees of shortcomings; the same time, the primary selection of 54 more than the mother cold-resistant plants, of which In addition, U70442 pear heart tree, cold hardiness and primary cold plants are very close, high quality, has been elected for three consecutive years; cold hardy single plant There was no significant difference between the primary selection rate and the type of natural interzygous parents, but both of them were significantly higher than those of the natural hybrids of type I. The resistance to cold and radiation of 109 seedlings of seedlings before sowing Can not see the significant correlation between .