An important determinant of flowering time variation in Arabidopsis, the FRIGIDA (FRI) gene has not been until recently investigated in economically important Brassica species. In diploid Brassica species, this gene exists as two paralogous loci on chromosomes A3 and A4 (B. rapa; A genome), and C3 and C9 (B. oleracea; C genome). Each locus is represented by several genome-specific alleles, which are discerned primarily by polymorphisms in C- and especially N-terminal regions. Locus- and genome-specific sequences of two FRI paralogues are conserved almost completely in the subgenomes A and C of tetraploid B. napus. The phylogenetic analysis of available FRI sequences presumes that the duplication of FRI loci preceded speciation in the genus Brassica.
Russian Journal of Plant Physiology – Springer Journals
Published: Feb 17, 2013
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