Reference "Genetic structure and diversity in Oryza sativa L"

Reference ID

11020

Title

Genetic structure and diversity in Oryza sativa L

Source

Genetics, 2005, vol. 169, pp. 1631-1638

Authors (5)

Garris-A-J	Tai-T-H
Coburn-J	Kresovich-S
McCouch-S

Abstract

The population structure of domesticated species is influenced by the natural
history of the populations of predomesticated ancestors, as well as by the
breeding system and complexity of the breeding practices exercised by humans.
Within Oryza sativa, there is an ancient and well-established divergence between
the two major subspecies, indica and japonica, but finer levels of genetic
structure are suggested by the breeding history. In this study, a sample of 234
accessions of rice was genotyped at 169 nuclear SSRs and two chloroplast loci.
The data were analyzed to resolve the genetic structure and to interpret the
evolutionary relationships between groups. Five distinct groups were detected,
corresponding to indica, aus, aromatic, temperate japonica, and tropical
japonica rices. Nuclear and chloroplast data support a closer evolutionary
relationship between the indica and the aus and among the tropical japonica,
temperate japonica, and aromatic groups. Group differences can be explained
through contrasting demographic histories. With the availability of rice genome
sequence, coupled with a large collection of publicly available genetic
resources, it is of interest to develop a population-based framework for the
molecular analysis of diversity in O. sativa.