Combinations of Hd2 and Hd4 genes determine rice adaptability to Heilongjiang Province, northern limit of China
Combinations of Hd2 and Hd4 genes determine rice adaptability to Heilongjiang Province, northern limit of China
复制标题
Hd2和Hd4基因的组合决定了水稻对中国北界黑龙江省的适应性
DOI：
10.1111/jipb.12326
复制
发表时间：
2015-08-01
影响因子：
11.4
通讯作者：
Bu, Qingyun
中科院分区：
文献类型：
--
作者：
Li, Xiufeng;Liu, Huazhao;Bu, Qingyun
抽穗期是水稻驯化和适应的一个重要性状，目前已鉴定出许多数量性状基因座。水稻（Oryza sativa L.）在中国最北部的黑龙江省，栽培品种必须极早开花以完成它们的生命周期。然而，控制该地区早花的关键基因或不同基因组合尚未确定。QTL和候选基因分析表明，Hd2/Ghd 7. 1/OsPRR 37在黑龙江省水稻分布中起主要控制作用。进一步的关联分析表明，在自然长日照条件下，Hd 4/Ghd 7、Hd 5/DTH 8/Ghd 8和Hd 1也参与了抽穗期的调控。Hd2/Ghd7.1/OsPRR 37和Hd 4/Ghd 7是两个主效QTL，作用加性。随着水稻北移，Hd2/Ghd7.1/OsPRR 37和Hd 4/Ghd 7单倍型变为无功能等位基因。hd 1在黑龙江省大部分水稻品种中可能是无功能的，这表明隐性hd 1在当地水稻育种中被选择。非功能性的Hd 5/DTH 8/Ghd 8是非常罕见的，但构成了极早开花品种育种的潜在目标。结果表明，Hd 1、Hd2、Hd 4和Hd 5的不同遗传组合决定了水稻品种在中国最北省份的不同分布。
Heading date is a key trait in rice domestication and adaption, and a number of quantitative trait loci (QTLs) have been identified. The rice (Oryza sativa L.) cultivars in the Heilongjiang Province, the northernmost region of China, have to flower extremely early to fulfill their life cycle. However, the critical genes or different gene combinations controlling early flowering in this region have not been determined. QTL and candidate gene analysis revealed that Hd2/Ghd7.1/OsPRR37 plays a major role in controlling rice distribution in Heilongjiang. Further association analysis with a collection of rice cultivars demonstrated that another three major QTL genes (Hd4/Ghd7, Hd5/DTH8/Ghd8, and Hd1) also participate in regulating heading date under natural long day (LD) conditions. Hd2/Ghd7.1/OsPRR37 and Hd4/Ghd7 are two major QTLs and function additively. With the northward rice cultivation, the Hd2/Ghd7.1/OsPRR37 and Hd4/Ghd7 haplotypes became non-functional alleles. Hd1 might be non-functional in most Heilongjiang rice varieties, implying that recessive hd1 were selected during local rice breeding. Non-functional Hd5/DTH8/Ghd8 is very rare, but constitutes a potential target for breeding extremely early flowering cultivars. Our results indicated that diverse genetic combinations of Hd1, Hd2, Hd4, and Hd5 determined the different distribution of rice varieties in this northernmost province of China.