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The Plant Cell, Vol. 15, 16711682, July 2003, www.plantcell.org 2003 American Society of Plant Biologists PIE1, an ISWI Family Gene, Is Required for FLC Activation and
 

Summary: The Plant Cell, Vol. 15, 16711682, July 2003, www.plantcell.org 2003 American Society of Plant Biologists
PIE1, an ISWI Family Gene, Is Required for FLC Activation and
Floral Repression in Arabidopsis
Yoo-Sun Noh1 and Richard M. Amasino2
Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin, Madison, Wisconsin 53706-1544
Proper control of the floral transition is critical for reproductive success in flowering plants. In Arabidopsis, FLOWERING
LOCUS C (FLC) is a floral repressor upon which multiple floral regulatory pathways converge. Mutations in PHOTOPERIOD-
INDEPENDENT EARLY FLOWERING1 (PIE1) suppress the FLC-mediated delay of flowering as a result of the presence of
FRIGIDA or of mutations in autonomous pathway genes. PIE1 is required for high levels of FLC expression in the shoot
apex, but it is not required for FLC expression in roots. PIE1 is similar to ATP-dependent, chromatin-remodeling proteins of
the ISWI and SWI2/SNF2 family. The role of PIE1 as an activator of FLC is consistent with the general role of ISWI and SWI2/
SNF2 family genes as activators of gene expression. The pie1 mutation also causes early flowering in noninductive photo-
periods independently of FLC; thus, PIE1 appears to be involved in multiple flowering pathways. PIE1 also plays a role in
petal development, as revealed by the suppression of petal defects of the curly leaf mutant by the pie1 mutation.
INTRODUCTION
Flowering, the transition from vegetative to reproductive growth,
is a major developmental switch in plants. Plants have evolved
several pathways to regulate the timing of the floral transition
and thus ensure maximum reproductive success. In Arabidop-
sis, four major floral promotion pathways have been identified

  

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

 

Collections: Biology and Medicine