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AOBPreview originally published online on June 29, 2005
Annals of Botany 2005 96(3):461-466; doi:10.1093/aob/mci197
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Published by Oxford University Press on behalf of the Annals of Botany Company 2005

Distribution of Fertility-restorer Genes for Wild-abortive and Honglian CMS Lines of Rice in the AA Genome Species of Genus Oryza

SHAOQING LI, GUOHUA YANG, SHAOBO LI, YANGSHENG LI, ZUYU CHEN and YINGGUO ZHU*

Key Laboratory of MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan, 430072, PR China

* For correspondence. E-mail zhuyg{at}public.wh.hb.cn

Received: 10 October 2004    Returned for revision: 3 February 2005    Accepted: 12 May 2005    Published electronically: 29 June 2005

• Background and Aims Rice (Oryza sativa) is one of the most important cereal plants in the world. Wild-abortive (WA) and Honglian (HL) cytoplasmic male sterility (CMS) have been used extensively in the production of hybrid seeds. Although a variable number of fertility-restorer genes (Rf) for WA and HL-CMS have been identified in various cultivars, information on Rf in Oryza species with the AA-genome is sparse. Therefore the distribution and heredity of Rf for WA and HL-CMS in wild rice species of Oryza with the AA-genome were investigated.

• Methods Fertility-restorer genes for WA and HL-CMS in wild rice species with the AA-genome were investigated by following the fertility of microspores identified by I2–KI staining and by following the seed-setting rate of spikelets. A genetic model of Rf in some selected restorer accessions was analysed based on the fertility segregation of BC1F1 populations.

• Key Results Fertility analysis showed that 21 out of 35 HL-type F1s, and 13 out of 31 WA-type F1s were scored as fertile. The frequency of Rf in wild rice was 60 % for HL-CMS and 41·9 % for WA-CMS, respectively. The fertility-restorer accessions, especially those with complete restoring ability, aggregated mainly in two species of O. rufipogon and O. nivara. The wild rice accessions with Rf for HL-CMS were distributed in Asia, Oceania, Latin American and Africa, but were centered mainly in Asia, whilst the wild restorer accessions for WA-CMS were limited only to Asia and Africa. Apart from one restorer accession that possessed two pairs of Rf for WA-CMS, all of the other nine tested wild restorer accessions each contained only a single Rf for WA-CMS or HL-CMS. Allele analysis indicated that there existed at least three Rf loci for the WA and HL-CMS systems.

• Conclusions These data support the hypothesis that fertility-restorer genes exist widely in Oryza species with the AA-genome, and that Rf in Oryza sativa originated from the Oryza rufipogon/Oryza nivara complex, the ancestor of cultivated rice in Asia. The origin and evolution of Rf is tightly linked to that of CMS in wild rice, and fertility of a given CMS type is controlled by several Rf alleles in various wild restorer accessions.

Key words: AA genome, Oryza, cytoplasmic male sterility, fertility-restorer genes, distribution, heredity, Honglian, wild-abortive


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