Multilocus analysis of nucleotide variation of Oryza sativa and its wild relatives: severe bottleneck during domestication of rice.

Abstract:

:Varying degrees of reduction of genetic diversity in crops relative to their wild progenitors occurred during the process of domestication. Such information, however, has not been available for the Asian cultivated rice (Oryza sativa) despite its importance as a staple food and a model organism. To reveal levels and patterns of nucleotide diversity and to elucidate the genetic relationship and demographic history of O. sativa and its close relatives (Oryza rufipogon and Oryza nivara), we investigated nucleotide diversity data from 10 unlinked nuclear loci in species-wide samples of these species. The results indicated that O. rufipogon and O. nivara possessed comparable levels of nucleotide variation ((sil) = 0.0077 approximately 0.0095) compared with the relatives of other crops. In contrast, nucleotide diversity of O. sativa was as low as (sil) = 0.0024 and even lower ((sil) = 0.0021 for indica and 0.0011 for japonica), if we consider the 2 subspecies separately. Overall, only 20-10% of the diversity in the wild species was retained in 2 subspecies of the cultivated rice (indica and japonica), respectively. Because statistic tests did not reject the assumption of neutrality for all 10 loci, we further used coalescent to simulate bottlenecks under various lengths and population sizes to better understand the domestication process. Consistent with the dramatic reduction in nucleotide diversity, we detected a severe domestication bottleneck and demonstrated that the sequence diversity currently found in the rice genome could be explained by a founding population of 1,500 individuals if the initial domestication event occurred over a 3,000-year period. Phylogenetic analyses revealed close genetic relationships and ambiguous species boundary of O. rufipogon and O. nivara, providing additional evidence to treat them as 2 ecotypes of a single species. Lowest linkage disequilibrium (LD) was found in the perennial O. rufipogon where the r(2) value dropped to a negligible level within 400 bp, and the highest in the japonica rice where LD extended to the entirely sequenced region ( approximately 900 bp), implying that LD mapping by genome scans may not be feasible in wild rice due to the high density of markers needed.

journal_name

Mol Biol Evol

authors

Zhu Q,Zheng X,Luo J,Gaut BS,Ge S

doi

10.1093/molbev/msm005

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

875-88

issue

3

eissn

0737-4038

issn

1537-1719

pii

msm005

journal_volume

24

pub_type

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