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Multiple introgression events surrounding the Hd1 flowering-time gene in cultivated rice, Oryza sativa L  [2010]

Fujino, Kenji Wu, Jianzhong Sekiguchi, Hiroshi Ito, Tomoko et al.

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Abstract
Flowering time is a major determinant for the local adaptation of crops. Hd1 is a key flowering-time gene in rice and is orthologous to the Arabidopsis CONSTANS gene. To elucidate the role of Hd1 in selection, we examined the Hd1 alleles of 60 landraces of Asian cultivated rice (Oryza sativa L.) originating from all regions of Asia, which comprised three cultivar groups, indica, japonica, and aus. The identified alleles were classified into four allele groups. The functional Hd1 alleles in allele groups I and II corresponded to indica and japonica, respectively. Non-functional alleles in these groups were not clearly associated with cultivar groups or locations. Allele groups III and IV corresponded to the aus cultivar group. The ancestry of each cultivar group was identified by the coalescent approach for Hd1 molecular evolution using the haplotype patterns of 14 regions over the 1.1 Mb chromosomal region surrounding Hd1 and the pSINE patterns of two loci, 1.4 and 4.4 Mb apart from Hd1. The haplotype patterns clearly revealed that Hd1 allele migration was caused by multiple and complex introgression events between cultivar groups. The Hd1 haplotypes among dozens of accessions of the wild species O. rufipogon were strongly divergent and only two of the haplotype clusters in O. rufipogon were closely related to those in cultivated rice. This strongly suggested that multiple introgression events have played an important role in the shaping and diversificatio
n of adaptation in addition to primary selection steps at the beginning of domestication.
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Other subjects

  • Hd1
  • adaptation
  • Flowering time
  • rice
  • introgression
  • CONSTANS

From the journal

Molecular genetics and genomics MGG

ISSN : 1617-4615

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Other information

Language : English

Type : Journal Article

In AGRIS since : 2013

Volume : 284

Issue : 2

Start Page : 137

End Page : 146

Publisher : Berlin/Heidelberg : Springer-Verlag

All titles :

" Multiple introgression events surrounding the Hd1 flowering-time gene in cultivated rice, Oryza sativa L "