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THE PLANT CELL, Vol 3, Issue 8 771-781, Copyright © 1991 by American Society of Plant Biologists
LEAFY, a Homeotic Gene That Regulates Inflorescence Development in Arabidopsis
E. A. Schultz and G. W. Haughn
Biology Department, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0, Canada
Variation in plant shoot structure may be described as occurring through
changes within a basic unit, the metamer. Using this terminology, the
apical meristem of Arabidopsis produces three metameric types sequentially:
type 1, rosette; type 2, coflorescence-bearing with bract; and type 3,
flower-bearing without bract. We describe a mutant of Arabidopsis, Leafy,
homozygous for a recessive allele of a nuclear gene LEAFY (LFY), that has
an inflorescence composed only of type 2-like metamers. These data suggest
that the LFY gene is required for the development of type 3 metamers and
that the transition from type 2 to type 3 metamers is a developmental step
distinct from that between vegetative and reproductive growth (type 1 to
type 2 metamers). Results from double mutant analysis, showing that lfy-1
is epistatic to the floral organ homeotic gene ap2-6, are consistent with
the hypothesis that a functional LFY gene is necessary for the expression
of downstream genes controlling floral organ identity.
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