文献类型： 会议论文

第一作者： H. Ikehashi

作者： H. Ikehashi ¹ ; Jiang-Shi Zou ² ; Pal Moon Huhn ³ ; K. Maruyama ⁴ ;

作者机构： 1.Faculty of Horticulture, Chiba University, Matsudo, 271-Japan

2.Institute of Food Crops, Jiangsu Academy of Agricultural Sciences

3.Crop Experiment Station, Suwon, 441-100, Korea

4.National Agricultural Research Center, Tsukuba, Ibaraki, 305 Japan

会议名称： International symposium on hybrid rice

主办单位：

页码： 1-11

摘要： F 1 sterility in indica-japonica hybrids is due to gamete abortion caused by an allelic interaction at a locus in chromosome 6. Some javanicas have a neutral allele at this locus. The gamete-abortion neutral allele S-5 n (wide compatibility gene [WCG]) has been incorporated into japonica types and utilized to develop fertile indica-japonica hybrids. Genetic analyses indicate that a new locus between Est-9 and Rc (red pericarp) in chromosome 7 is responsible for the hybrid sterility in some crosses between javanicas and a variety from the Indian subcontinent. The two S-loci indicate that hybrid sterility in most crosses is caused at one of the loci and that the alleles at the other locus remain neutral. A general system to identify S-loci is being developed.Some WCG lines for indica-japonica hybrids have been developed in China and Japan. Two experimental indica-japonica hybrids have been tested in Japan. Indicajaponica hybrids are sensitive to cold weather in temperate regions. In BT cytoplasm,which is effective in the japonica background, the Rf gene functions at gamete level,producing 50% fertile gametes and 50% sterile, lowering the ratio of fertile pollen,which aggravates cold damage in ndica-japonica hybrids. The hybrid sterility shown in male gametes also lowers the pollen fertility in indica-japonica hybrids. Segregation distortion in many marker genes was observed in indica-japonica hybrids, implying that substantial numbers of male gametes are aborted in the hybrids.Genetic analyses as well as selection are important for developing hybrids with sound pollen. Synchronization of flowering between indicas and japonicas is necessary for seed production.

分类号： Q781`S334