State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University , Nanjing 210095, China.
Breed Sci. 2013 Jun;63(2):164-8. doi: 10.1270/jsbbs.63.164. Epub 2013 Jun 1.
Superior plant architecture is a key means of enhancing yield potential in high yielding varieties. A newly identified recessive gene, named sd-c, controls plant height and tiller number. Genetic analysis of an F2 population from a cross between the semi-dwarf mutant and japonica cv. Houshengheng showed that the sd-c locus was flanked by SSR markers RM27877 and RM277 on chromosome 12. Thirty nine InDel markers were developed in the region and the sd-c gene was further mapped to a 1 cM centromeric region between InDel markers C11 and C12. These sequenced markers can be used to distinguish wild type and mutants and thus can be used in marker-assisted selection. The sd-c mutant decreases culm length by about 26% and doubles the tiller number without changing seed weight. Until now only sd-1 has been used in indica rice breeding programs. The sd-c mutant seems to have no undesirable pleiotropic effects and is therefore a potential genetic resource for breeding semi-dwarf indica rice cultivars.
优良的株型结构是提高高产品种产量潜力的关键手段。一个新鉴定的隐性基因，命名为 sd-c，控制株高和分蘖数。半矮秆突变体与籼稻品种后生成 F2 群体的遗传分析表明，sd-c 位点位于第 12 号染色体上的 SSR 标记 RM27877 和 RM277 之间。在该区域开发了 39 个 InDel 标记，并将 sd-c 基因进一步定位到 InDel 标记 C11 和 C12 之间的 1cM 着丝粒区域。这些测序标记可用于区分野生型和突变体，因此可用于标记辅助选择。sd-c 突变体使茎长减少约 26%，分蘖数增加一倍，而种子重量不变。到目前为止，只有 sd-1 被用于籼稻的育种计划。sd-c 突变体似乎没有不良的多效性影响，因此是培育半矮籼稻品种的潜在遗传资源。
