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AOBPreview published online on October 20, 2006
Annals of Botany, doi:10.1093/aob/mcl210
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© The Author 2006. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received June 1, 2006
Revised July 5, 2006
Accepted August 24, 2006

Article

Genetic Diversity and Origin of Weedy Rice (Oryza sativa f. spontanea) Populations Found in North-eastern China Revealed by Simple Sequence Repeat (SSR) Markers

QIANJIN CAO 1, BAO-RONG LU 1 *, HUI XIA 1, JUN RONG 1, FRANCESCO SALA 2, ALBERTO SPADA 2, and FABRIZIO GRASSI 2

1 Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai 200433, China
2 Department of Biology, Botanical Garden, University of Milan, Via Celoria, 26, 20133 Milano, Italy

* To whom correspondence should be addressed.
BAO-RONG LU, E-mail: brlu{at}fudan.edu.cn


  Abstract

• Background and Aims Weedy rice (Oryza sativa f. spontanea) is one of the most notorious weeds occurring in rice-planting areas worldwide. The objectives of this study are to determine the genetic diversity and differentiation of weedy rice populations from Liaoning Province in North-eastern China and to explore the possible origin of these weedy populations by comparing their genetic relationships with rice varieties (O. sativa) and wild rice (O. rufipogon) from different sources.

• Methods Simple sequence repeat (SSR) markers were used to estimate the genetic diversity of 30 weedy rice populations from Liaoning, each containing about 30 individuals, selected rice varieties and wild O. rufipogon. Genetic differentiation and the relationships of weedy rice populations were analysed using cluster analysis (UPGMA) and principle component analysis (PCA).

• Key Results The overall genetic diversity of weedy rice populations from Liaoning was relatively high (He = 0·313, I = 0·572), with about 35 % of the genetic variation found among regions. The Liaoning weedy rice populations were closely related to rice varieties from Liaoning and japonica varieties from other regions but distantly related to indica rice varieties and wild O. rufipogon.

• Conclusions Weedy rice populations from Liaoning are considerably variable genetically and most probably originated from Liaoning rice varieties by mutation and intervarietal hybrids. Recent changes in farming practices and cultivation methods along with less weed management may have promoted the re-emergence and divergence of weedy rice in North-eastern China.

Keywords: Oryza sativa, O. spontanea, O. rufipogon, weedy rice, molecular markers, simple sequence repeat (SSR), genetic diversity, differentiation, origin.
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