Using Heading date 1 preponderant alleles from indica cultivars to breed high-yield, high-quality japonica rice varieties for cultivation in south China
Using Heading date 1 preponderant alleles from indica cultivars to breed high-yield, high-quality japonica rice varieties for cultivation in south China
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利用籼稻品种抽穗1号优势等位基因选育华南地区高产优质粳稻品种
DOI：
10.1111/pbi.13177
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发表时间：
2020-01-01
影响因子：
13.8
通讯作者：
Zeng, Dali
中科院分区：
文献类型：
--
作者：
Leng, Yujia;Gao, Yihong;Zeng, Dali
抽穗期1（Hd 1）是水稻开花调控的重要基因，但其在主要栽培稻品种中的变异及其对产量和品质的影响尚不清楚。本研究选取了1936 - 2009年中国主要栽培的123个水稻品种，分析了Hd 1等位基因与产量相关性状的关系。在这些品种中，Hd 1共检测到19种单倍型，其中粳稻组有2种主要单倍型（H8和H13），籼稻组有3种主要单倍型（H14、H15和H16）。等位基因频率分析表明，二次分支数是中国籼稻育种的主要目标。在5种主要单倍型中，SNP 316（C-T）是两种主要粳稻单倍型的唯一差异，SNP 495（C-G）和SNP 614（G-A）是3种籼稻单倍型的主要差异。关联分析表明，H16是中国现代栽培籼稻品种中最具优势的等位基因。将该等位基因回交到粳稻品种春江06中，在不降低稻米品质的情况下提高了产量。因此，本研究为利用这些优势等位基因改良我国南方粳稻品种的产量和品质提供了新的策略。
Heading date 1 (Hd1) is an important gene for the regulation of flowering in rice, but its variation in major cultivated rice varieties, and the effect of this variation on yield and quality, remains unknown. In this study, we selected 123 major rice varieties cultivated in China from 1936 to 2009 to analyse the relationship between the Hd1 alleles and yield-related traits. Among these varieties, 19 haplotypes were detected in Hd1, including two major haplotypes (H8 and H13) in the japonica group and three major haplotypes (H14, H15 and H16) in the indica group. Analysis of allele frequencies showed that the secondary branch number was the major aimed for Chinese indica breeding. In the five major haplotypes, SNP316(C-T) was the only difference between the two major japonica haplotypes, and SNP495(C-G) and SNP614(G-A) are the major SNPs in the three indica haplotypes. Association analysis showed that H16 is the most preponderant allele in modern cultivated Chinese indica varieties. Backcrossing this allele into the japonica variety Chunjiang06 improved yield without decreasing grain quality. Therefore, our analysis offers a new strategy for utilizing these preponderant alleles to improve yield and quality of japonica varieties for cultivation in the southern areas of China.