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Abstract Variation in flowering time is important for the adaptation of plant species to different natural and
 

Summary: Abstract Variation in flowering time is important for
the adaptation of plant species to different natural and
agricultural environments. We previously identified
VFR2 as one of two major quantitative trait loci (QTLs)
controlling vernalization-responsive flowering time in a
segregating population derived from a cross of annual
and biennial Brassica rapa. The region containing VFR2
is homologous to a region in Brassica napus that con-
trols the same trait, and also to a region on chromosome
5 of Arabidopsis thaliana that contains several flower-
ing-time loci. In order to determine precisely the allelic
effects and map position of VFR2, we backcrossed the
late allele into an early flowering line and obtained
monogenic segregation for flowering time in a BC3S1
population. The two homozygous genotypic classes dif-
fered by 43 and 95 days to flowering in the field and
growth chamber, respectively; and the effect of the late
allele was almost completely additive. DNA probes that
were previously shown to detect RFLP loci in the VFR2
region, or in the homologous regions of B. napus or A.

  

Source: Amasino, Richard M. - Department of Biochemistry, University of Wisconsin at Madison

 

Collections: Biology and Medicine