Antagonistic roles of SEPALLATA3, FT and FLC genes as targets of the polycomb group gene CURLY LEAF.

Antagonistic roles of SEPALLATA3, FT and FLC genes as targets of the polycomb group gene CURLY LEAF.
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DOI:
10.1371/journal.pone.0030715
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Goodrich J
Goodrich J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lopez-Vernaza M;Yang S;Müller R;Thorpe F;de Leau E;Goodrich J

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在拟南芥中,Pc-G基因卷曲叶(CLF)的突变产生了具有卷曲叶的早花植物。这种表型是由花同源异型基因AGAMOUS(AG)在叶中的错误表达引起的,因此AG突变在很大程度上抑制了clf表型。在这里,我们确定了三个突变,抑制clf,尽管保持高AG表达。我们发现,抑制基因对应于FPA和FT,两个基因促进开花,并在SEPALLATA 3(SEP 3),它编码的辅助因子AG蛋白的突变。在所有情况下,clf表型的抑制与低SEP 3表达相关,并且揭示了SEP 3除了在控制花器官特性中的作用之外还具有促进开花的作用。clf ft突变体的遗传分析表明,CLF促进开花通过减少FLC的表达,开花的阻遏物。我们的结论是,SEP 3是关键目标介导的clf表型,CLF靶基因的拮抗作用掩盖了CLF促进开花的作用。
In Arabidopsis, mutations in the Pc-G gene CURLY LEAF (CLF) give early flowering plants with curled leaves. This phenotype is caused by mis-expression of the floral homeotic gene AGAMOUS (AG) in leaves, so that ag mutations largely suppress the clf phenotype. Here, we identify three mutations that suppress clf despite maintaining high AG expression. We show that the suppressors correspond to mutations in FPA and FT, two genes promoting flowering, and in SEPALLATA3 (SEP3) which encodes a co-factor for AG protein. The suppression of the clf phenotype is correlated with low SEP3 expression in all case and reveals that SEP3 has a role in promoting flowering in addition to its role in controlling floral organ identity. Genetic analysis of clf ft mutants indicates that CLF promotes flowering by reducing expression of FLC, a repressor of flowering. We conclude that SEP3 is the key target mediating the clf phenotype, and that the antagonistic effects of CLF target genes masks a role for CLF in promoting flowering.
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