This research is concerned to clone the flower - timing genes of betula platyphalla under the intensive condition by orthologus gene cloning technique . the purpose is to reveal the control mechanism of early flowering genes of this species , and also to analyze some special gene ' s expression in that condition 實(shí)驗(yàn)旨在利用rt - pcr技術(shù)克隆白樺( betulaplatyphalla )的成花計(jì)時(shí)相關(guān)基因,從而為揭示強(qiáng)化條件下白樺提早開花結(jié)實(shí)的基因調(diào)控機(jī)理奠定基礎(chǔ)。