13个新选水稻不育系播始历期配合力分析

Analysis of combining ability of 13 new sterile lines in rice at heading date

用14个强配合力的恢复系与新选的13个综合农艺性状优良的不育系测配,获得182个F1,以考察13个不育系播始历期的配合力。结果表明,B8播始历期一般配合力最好,其次为B1、B4、B7,一般配合力较差的为B10、B11、B12。B8、B1、B4、B7更容易配出比对照早3 d及以上的杂交稻组合,B2、B5、B10、B11、B12、B13不容易配出比对照早熟3 d及以上的组合。播始历期性状的遗传力较高,不育系播始历期与其一般配合力相关系数达到0.71。

A total of 182 F1 were obtained by combining 14 restorer lines with strong combining ability with 13 newly selected sterile lines with excellent comprehensive agronomic traits,so as to investigate the combining ability of 13 sterile lines at heading date.The results showed that B8 had the best general combining ability,followed by B1,B4 and B7,and B10,B11 and B12 had the worst general combining ability.Hybrid rice combinations of B8,B1,B4 and B7 were more likely to be bred 3 days earlier than those of the control,and combinations of B2,B5,B10,B11,B12 and B13 were not easy to be bred 3 days earlier than those of the control.The heritability of heading date was higher,and the correlation coefficient between heading date and general combining ability was 0.71.