Affiliation:
1. Department of Biological Sciences, University of South Carolina, Columbia, SC 29208
2. Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
3. Center for Plant Biology, Purdue University, West Lafayette, IN 47907
Abstract
Organ initiation from the shoot apical meristem first gives rise to leaves during vegetative development and then flowers during reproductive development.
LEAFY
(
LFY
) is activated after floral induction and together with other factors promotes the floral program. LFY functions redundantly with APETALA1 (AP1) to activate the class B genes
APETALA3
(
AP3
) and
PISTILLATA
(
PI
), the class C gene
AGAMOUS
(
AG
), and the class E gene
SEPALLATA3
, which leads to the specification of stamens and carpels, the reproductive organs of flowers. Molecular and genetic networks that control the activation of
AP3,
PI,
and
AG
in flowers have been well studied; however, much less is known about how these genes are repressed in leaves and how their repression is lifted in flowers. Here, we showed that two genes encoding
Arabidopsis
C2H2 ZINC FINGER PROTEIN (ZFP) transcription factors, ZP1 and ZFP8, act redundantly to directly repress
AP3,
PI,
and
AG
in leaves. After
LFY
and
AP1
are activated in floral meristems, they down-regulate
ZP1
and
ZFP8
directly to lift the repression on
AP3,
PI,
and
AG
. Our results reveal a mechanism for how floral homeotic genes are repressed and derepressed before and after floral induction.
Funder
National Science Foundation
Publisher
Proceedings of the National Academy of Sciences
Cited by
3 articles.
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