Ref ID:	30675
Ref Type:	Journal Article
Authors:	Yamanaka, Shinsuke Nakamura, Ikuo Nakai, Hirokazu Sato, Yo-Ichiro
Title:	Dual origin of the cultivated rice based on molecular markers of newly collected annual and perennial strains of wild rice species, <i>Oryza nivara</i> and <i>O. rufipogon</i>
Date:	2003
Source:	Genetic Resources and Crop Evolution
Abstract:	The direct ancestor of rice (Oryza sativa L.) is believed to be AA genome wild relatives of rice in Asia. However, the AA genome wild relatives involve both annual and perennial forms. The distribution of the retrotransposon p-SINE1-r2, a short interspersed nuclear element (SINE) at the waxy locus was analyzed in diverse accessions of the AA genome wild relatives of rice (O. rufipogon sensu lato). Most annual wild rice accessions had this retrotransposon, while most perennial types lacked this element, contradicting results to the previous studies. Results presented here suggest that O. sativa has dual origin that lead to indica-japonica differentiation. Results suggest the indica line of rice varieties evolved from the annual genepool of AA genome and the japonica varieties from the perennial genepool of AA genome wild rice.
Date Created:	8/6/2004
Volume:	50
Number:	5
Page Start:	529
Page End:	538