北斗是从日本引进的优良苹果新品种。为了加速繁殖,我们从1987年开始进行离体茎尖培养,经过三年多的工作培养获得了北斗组培自根苗。试管苗转砂培的移栽成活率达90%以上,砂培茁转入土培平均成活率为81.5%,土培苗移入田间成活率达到90%以上。现将研究工作情况作简要总结。 Compass is the introduction of new apple varieties from Japan. In order to speed up the breeding, we started ex vivo stem shoot culture since 1987. After more than three years of work, we obtained the self-rooted shoots of Beidou tissue culture. Survival rate of transplanting of test-tube seedlings to sand culture reached more than 90%. The average surviving rate of soil culture into soil culture reached 81.5%. Survival rate of soil-cultivated seedlings into field reached more than 90%. The research work is briefly summarized.