In:
New Phytologist, Wiley, Vol. 200, No. 4 ( 2013-12), p. 1269-1280
Abstract:
The size of cultivated rice ( Oryza sativa ) grains has been altered by both domestication and artificial selection over the course of evolutionary history. Several quantitative trait loci ( QTL s) for grain size have been cloned in the past 10 yr. To explore the natural variation in these QTL s, resequencing of grain width and weight 2 ( GW 2 ), grain size 5 ( GS 5 ) and QTL for seed width 5 ( q SW 5 ) and genotyping of grain size 3 ( GS 3 ) were performed in the germplasms of 127 varieties of rice ( O . sativa ) and 10–15 samples of wild rice ( O ryza rufipogon ). Ten, 10 and 15 haplotypes were observed for GW 2 , GS 5 and q SW 5 . q SW 5 and GS 3 had the strongest effects on grain size, which have been widely utilized in rice production, whereas GW 2 and GS 5 showed more modest effects. GS 5 showed small sequence variations in O . sativa germplasm and that of its progenitor O . rufipogon . q SW 5 exhibited the highest level of nucleotide diversity. GW 2 showed signs of purifying selection. The four grain size genes experienced different selection intensities depending on their genetic effects. In the indica population, linkage disequilibrium ( LD ) was detected among GS 3 , q SW 5 and GS 5 . The substantial genetic variation in these four genes provides the flexibility needed to design various rice grain shapes. These findings provide insight into the evolutionary features of grain size genes in rice.
Type of Medium:
Online Resource
ISSN:
0028-646X
,
1469-8137
DOI:
10.1111/nph.2013.200.issue-4
Language:
English
Publisher:
Wiley
Publication Date:
2013
detail.hit.zdb_id:
208885-X
detail.hit.zdb_id:
1472194-6
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