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The Arabidopsis floral meristem identity genes AP1, AGL24 and SVP directly repress class B and C floral homeotic genes
Author(s) -
Gregis Veronica,
Sessa Alice,
DorcaFornell Carmen,
Kater Martin M.
Publication year - 2009
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/j.1365-313x.2009.03985.x
Subject(s) - homeotic gene , meristem , arabidopsis , gene , biology , class (philosophy) , genetics , botany , transcription factor , mutant , computer science , artificial intelligence
Summary During the initial stages of flower development, floral meristems increase in size without the formation of floral organs. When a critical meristem size is reached, the floral meristem begins to develop the floral organs. The first stages of flower development are characterized by the expression of genes such as APETALA 1 ( AP1 ), CAULIFLOWER ( CAL ), AGAMOUS‐LIKE 24 ( AGL24 ) and SHORT VEGETATIVE PHASE ( SVP ). We have shown that AP1 , AGL24 and SVP act redundantly to control the identity of the floral meristem and to repress expression of class B, C and E genes. Recently, it was shown that class E gene repression was direct and established by two independent pathways. We show here that repression of class B and C genes is also directly established by a co‐repressor complex that comprises LEUNIG (LUG), SEUSS (SEU) and the MADS box dimers AP1–AGL24 and AP1–SVP. Furthermore, we show that the distantly related SUPPRESSOR OF OVEREXPRESSION OF CO 1 ( SOC1 ) MADS box gene can complement for the loss of AGL24 and SVP activity; however, under normal conditions, this transcription factor does not play a role during the early stages of flower development.