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通过神州八号飞船搭载广东省常规优质稻主导品种粤农丝苗获得一个稳定遗传的穗型突变体cl,中文名为粤花占1号,2015年完成农业部植物新品种权的申请工作(申请号:20151728.8,公告号:CNA014491E)。该突变体农艺性状与野生型极为相似,熟色好,产量高,但表现出异常的花序结构,一次枝梗数增加,二次枝梗、小穗梗长度严重缩短,枝梗顶端小穗3粒簇生在一起。进一步的细胞学观测发现,差异主要源自幼穗分化的第3期到第4期发育异常所致。遗传分析表明该性状由非完全显性单基因控制,BSA性状定位法初步将该基因定位于染色体6,命名为CL-6。本研究的结果为进一步精细定位和克隆CL-6基因、找到控制水稻幼穗枝梗伸长缩短的功能基因或调控因子奠定基础,同时为培育理想穗型水稻和观赏农业提供优良种质。
Through the Shenzhou 8 spacecraft equipped with the Guangdong province conventional high-quality rice leading varieties of Guangdong silkworm seedlings to obtain a stable inheritance of the spike-type mutant cl, the Chinese name of Guangdong accounted for No. 1, in 2015 the Ministry of Agriculture to complete the application of plant variety rights Application number: 20151728.8, announcement number: CNA014491E). The agronomic traits of the mutant were very similar to the wild type, with good ripe color and high yield, but showed abnormal inflorescence structure. The number of primary branches increased, the length of secondary branches and spikelets severely shortened, and the top three spikelets Clustered together. Further cytological observation found that the difference mainly stems from the third to fourth differentiation of young spikes due to developmental abnormalities. Genetic analysis showed that the trait was controlled by a non-complete dominant single gene. The gene was initially mapped to chromosome 6 by the BSA trait mapping method and named CL-6. The results of this study lay a foundation for further fine mapping and cloning of CL-6 gene and finding functional genes or regulatory elements that control the elongation and shortening of young stems and provide excellent germplasm for cultivating ideal panicle rice and ornamental agriculture.