v.使回交

n.回交

Backcross with c ommon wheat had completely no seed set. 用普通小麥回交，未獲得回交后代。

The resistant level was declined with increasing of backcross generations. (2)在回交后代中，抗性水平逐代降低。

The results indicated that the dwarf plants of Iris germanica could be obtained through repeated backcrossing to the dwarf parent. 以花色為主要觀賞指標(biāo)的鳶尾矮生植株需通過(guò)與矮生親本的反復(fù)回交篩選得到。

The F1 plants of wheat/Y127 gave many tillers, but the backcrossing or self-pollinating descendants produced few seeds. 以普通小麥為母本與柱穗山羊草雜交，F(xiàn)1代分蘗率極高，植株性狀出現(xiàn)中親遺傳或超親遺傳，雜交種回交或自交結(jié)實(shí)率非常低。

Dwarfing-sterile wheat was changed from winterness to springness by continue backcross. 摘要利用連續(xù)回交手段將矮敗小麥由冬性轉(zhuǎn)育為春性。