Identification and Inheritance of Fertility Restorer Genes for 'tour' CMS in Rapeseed (<em>Brassica napus</em> L.).

Eighteen genotypes of Brassica napus were crossed to a cytoplasmic male sterile (CMS) line of B. napus BO15 carrying B. tournefortu cytoplasm (&#39;tour&#39; cytoplasm). Fourteen genotypes were found to be stable maintainers of the &#39;tour&#39; CMS. Of the remaining four genotypes, GSL-1 and &#39;Asahi-natane&#39; were found to be heterozygous and &#39;Mangun&#39; and &#39;Yudal&#39; were homozygous for the restorer gene. Analysis of the F[SUB1] and F[SUB2] progenies of (CMS) BO15 &#215; &#39;Mangun&#39; and (CMS) BO15 &#215; &#39;Yudal&#39; showed that fertility restoration is controlled by a single dominant gene.The availability of a number of stable maintainer lines and the simple inheritance pattern of fertility restorer gene makes &#39;tour&#39; CMS a useful system for hybrid seed production in rapeseed. [ABSTRACT FROM AUTHOR]