Abstract：
:Genetic analysis of "InochinoIchi," an exceptionally large grain rice variety, was conducted through five continuous backcrosses with Koshihikari as a recurrent parent using the large grain F3 plant in Koshihikari × Inochinoichi as a nonrecurrent parent. Thorough the F2 and all BCnF2 generations, large, medium, and small grain segregated in a 1:2:1 ratio, indicating that the large grain is controlled by a single allele. Mapping by using simple sequence repeat (SSR) and single nucleotide polymorphism (SNP) markers with small grain homozygous segregants in the F2 of Nipponbare × Inochinoichi, revealed linkage with around 7.7 Mb markers from the distal end of the short arm of chromosome 2. Whole-genome sequencing on a large grain isogenic Koshihikari (BC4F2) using next-generation sequencing (NGS) identified a single nucleotide deletion in GW2 gene, which is located 8.1 Mb from the end of chromosome 2, encoding a RING protein with E3 ubiquitin ligase activity. The GW2-integrated isogenic Koshihikari showed a 34% increase in thousand kernel weight compared to Koshihikari, while retaining a taste score of 80. We further developed a large grain/semi-dwarf isogenic Koshihikari integrated with GW2 and the semidwarfing gene d60, which was found to be localized on chromosome 2. The combined genotype secured high yielding while providing robustness to withstand climate change, which can contribute to the New Green Revolution.
journal_name
Int J Mol Scijournal_title
International journal of molecular sciencesauthors
Tomita M,Yazawa S,Uenishi Ydoi
10.3390/ijms20215442subject
Has Abstractpub_date
2019-10-31 00:00:00issue
21issn
1422-0067pii
ijms20215442journal_volume
20pub_type
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