树莓杂交后代实生苗部分性状的遗传变异分析

Genetic Analysis on Characters of Hybrid Seedlings in Raspberry

对树莓4个杂交或自交得到的197株2 a生实生苗的重要经济性状进行了调查和遗传分析。结果表明,亲本性状各异树莓杂交后代表现了相近的果形分布比例,均以圆锥形为主,其中3个组合后代中圆锥形果实超过了75%;短圆锥形和球型果比例相近,总和接近25%,后代中还出现了少量比例的畸形果。杂交后代可溶性固形物含量的分布受亲本影响,但变异幅度较宽。平均单果重受亲本影响极大,大果型品种美国22号和图拉米的后代的大果型比例偏多。图拉米是优良的无刺树莓育种亲本,其自交后代出现了21%的无刺植株。

Genetic research was done on main economic characters of 197 biennial raspberry seedlings from four combinations by self-crossing or crossing. The results indicated that the fruit shape of progenies from three cross combinations was very similar, with over 75% coniform fruits, in spite of parents＇ difference. The ratio of short coniform and spherical fruits in progenies among the four combinations was similar, with about 25%. There were few malformed frnits in the offspring. The content of soluble solids of the offspring was related to their parents, but with a large variation. Moreo ver, progenies＇ mean fruit weight was greatly affected by their parents. Large proportion of big--fruit progenies appeared in the self-crossing of two big-fruit euhivars Meiguo22 and Tulameen. Tulameen was an excellent germplasm for breed ing thornless raspberry cuhivars, with 21% thornless seedlings in its self-crossing progenies.