籼稻强休眠保持系Ⅱ112B与其双亲休眠性的比较  

Comparison on seed dormancy between high dormancy maintainer line Ⅱ112B and its parents in indica rice(Oryza sativa L.)

作　　者：徐保钦[1,2,3] 陆作楣[1] 

机构地区：[1]南京农业大学作物遗传与种质创新国家重点实验室,江苏南京210095 [2]济宁职业技术学院,山东济宁272100 [3]山东济宁农业学校,山东济宁272100

出　　处：《南京农业大学学报》2008年第4期8-12,共5页Journal of Nanjing Agricultural University

基　　金：长江学者和创新团队发展计划项目(IRT0432)

摘　　要：以强休眠籼稻保持系Ⅱ112B、恢复系IR112-12和无休眠籼稻保持系Ⅱ-32B以及2个杂交组合Ⅱ-32B/IR112-12、Ⅱ-32B/Ⅱ112B的六世代群体P1、P2、F1、F2、B1、B2为试验材料,研究了Ⅱ112B及其双亲种子休眠性的形成时间和解除时间以及颖壳与种胚对种子休眠性的影响,分析了种子休眠性的遗传特点。结果表明,Ⅱ-32B抽穗后20d时休眠指数为25.22%,随着种子成熟过程的推进,休眠指数逐渐下降,到成熟时降为0;Ⅱ112B、IR112-12抽穗后20d时休眠指数分别为88.89%和100%,随着种子成熟过程的推进,休眠指数一直保持在很高水平。Ⅱ112B、IR112-12收获后室温贮藏需要2-3个月解除休眠。强休眠品种的颖壳中含有发芽抑制物质,IR112-12颖壳中发芽抑制物质含量高于Ⅱ112B,Ⅱ-32B颖壳中不含发芽抑制物质或者发芽抑制物质含量甚微。IR112-12胚休眠指数比Ⅱ112B高,推测这可能是由于IR112-12休眠性强、休眠解除较慢。2个杂交组合休眠指数广义遗传力分别为98%和96%,狭义遗传力分别为65%和62%,休眠性是部分显性遗传,休眠性选择可以在早代进行。The forming and changing trend of seed dormancy and the influence of husk and embryo on seed dormancy were studied in Ⅱ112B and its parents,IR112-12 and Ⅱ-32B in indica rice（Oryza sativa L.）.Ⅱ112B and IR112-12 were a maintainer line and a restorer line,respectively,with high seed dormancy index.Ⅱ-32B was a maintainer line with low seed dormancy index.Heritability of seed dormancy was studied by using P1,P2,F1,F2,B1,B2 generations of Ⅱ-32B/IR112-12 and Ⅱ-32B/Ⅱ112B.Results showed that in Ⅱ-32B,seed dormancy index at the 20th day after heading was 25.22%,which declined slowly with the seed maturity,and disappeared at the maturing phase.While in Ⅱ112B and IR112-12,seed dormancy index at the 20th day after heading were 88.89% and 100%,respectively,always keeping at a high level with the seed maturity gradually.Seed dormancy of Ⅱ112B and IR112-12 could be relieved through 2-3 months after the seeds being harvested and stored at in-door natural conditions.Husks of Ⅱ112B and IR112-12 had inhibitor on seed germination.There was more inhibitor in the husks of IR112-12 than that of Ⅱ112B,and there was no inhibitor in the husks of Ⅱ-32B or the inhibitor of that was tiny.Seed dormancy index of embryo of IR112-12 was higher than that of Ⅱ112B.Maybe it is the reason why IR112-12 has higher seed dormancy index and it is more difficult to relieve the dormancy.The broad-sense heritability of the dormancy index was 98% and 96%,while the narrow-sense heritability was 65% and 62%,in the two combinations,respectively.High seed dormancy index was partial dominant of inheritance.Selection for seed dormancy,therefore,could be at early generations.

关 键 词：籼稻 保持系 胚休眠 休眠指数 广义遗传力 狭义遗传力 

分 类 号：S330[农业科学—作物遗传育种] S511[农业科学—农艺学]