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由于果树童期较长,树体较大,使得每年可提供选择的植株数量有限,且延长了育种周期,所以果树育种中遗传进展缓慢。为此采用以下两种方法来缩短童期:加速实生苗生长,迅速达到最大结果体积,促进结果;另外,是进行缩短童期育种,但要获得育种明显进展可能需要几个世代.如采用实生苗群体系统,可以使种子到结果的年遗传增量快速增长,减少实生苗中非遗传变异和管理效应.筛选实生苗群体两种有效办法是采用矮
Because fruit trees have longer childhood and larger trees, making a limited number of plants available each year and prolonging the breeding cycle, the genetic progress in fruit tree breeding is slow. There are two ways to shorten the life span: Accelerate the growth of the seedlings, quickly reach the maximum volume of the result, and promote the result. In addition, it is to shorten the breeding period, but it may take several generations to obtain significant progress in breeding. Seedling system can make the seed to the results of the rapid increase in genetic increment, reduce the non-genetic variation in the seedlings and management effects.Screening seedling population are two effective ways to use short