水稻显性早熟基因Ef-cd的分离鉴定和早熟效应分析

 Ef-cd基因是位于水稻第3染色体短臂上的一个显性早熟基因。本研究以早籼核不育系6442S-7为Ef-cd基因的供体亲本，通过连续回交与自交以及分子标记辅助选择，分离了Ef-cd基因，分别构建了以迟熟籼稻品系明恢63、蜀恢881和蜀恢527为受体亲本（遗传背景）的近等基因系，并在此基础上探明Ef-cd基因在纯合及杂合状态下一般可使水稻提早抽穗11～14 d。Ef-cd基因对促进水稻早熟与高产的有机结合，快速、高效培育出早熟超高产新品种具有重要意义。

Isolation, Identification and Earliness Effect Analysis of Rice Dominant Earliness Gene Ef-cd

Ef-cd gene is a dominant earliness gene located on the short arm of rice chromosome 3. In this paper, through continuous backcross, self-pollination and molecular marker assisted selection, individual Ef-cd gene was isolated and nearly isogenic early-maturing lines were constructed by using a genic male-sterile and early-maturing indica line 6442S-7 as donor, and late-maturing indica lines Minghui 63 (MH 63), Shuhui 881 (SH 881) and Shuhui 527 (SH 527) as recipients (genetic background), respectively. Further, it was found out that Ef-cd gene could generally advance rice to head 11-14 days earlier. So, it is considered that Ef-cd gene has an important role in rapid developing early-maturing and super high-yielding rice varieties.