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Attenuation of FLOWERING LOCUS C activity as a mechanism for the evolution of summer-annual

Summary: Attenuation of FLOWERING LOCUS C activity as a
mechanism for the evolution of summer-annual
flowering behavior in Arabidopsis
Scott D. Michaels, Yuehui He, Katia C. Scortecci, and Richard M. Amasino*
Department of Biochemistry, University of Wisconsin, Madison, WI 53706
Edited by Patricia C. Zambryski, University of California, Berkeley, CA, and approved June 4, 2003 (received for review March 13, 2003)
Plant species have evolved a wide variety of flowering habits, each
adapted to maximize reproductive success in their local environ-
ment. Even within a species, accessions from different environ-
ments can exhibit markedly different flowering behavior. In Ara-
bidopsis, some accessions are rapid-cycling summer annuals,
whereas others accessions are late flowering and vernalization
responsive and thus behave as winter annuals. Two genes, FLOW-
ERING LOCUS C (FLC) and FRIGIDA (FRI), interact synergistically to
confer the winter-annual habit. Previous work has shown that
many summer-annual accessions contain null mutations in the FRI
gene; thus it appears that these summer-annual accessions have
arisen from winter-annual ancestors by losing FRI function. In this
work we demonstrate that naturally occurring allelic variation in
FLC has provided another route to the evolution of summer-annual


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


Collections: Biology and Medicine