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Inflorescence abnormalities occur with overexpression of Arabidopsis lyrata FT in the fwa mutant of Arabidopsis thaliana.

Plant Sci. 2011 Oct;181(4):496-503. Epub 2011 Aug 05
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摘要


Arabidopsis thaliana is a quantitative long-day plant with the timing of the floral transition being regulated by both endogenous signals and multiple environmental factors. fwa is a late-flowering mutant, and this phenotype is due to ectopic FWA expression caused by hypomethylation at the FWA locus. The floral transition results in the activation of the floral development process, the key regulators being the floral meristem identity genes, AP1 (APETALA1) and LFY (LEAFY). In this study, we describe inflorescence abnormalities in plants overexpressing the Arabidopsis lyrata FT (AlFT) and A. thaliana FWA (AtFWA) genes simultaneously. The inflorescence abnormality phenotype was present in only a proportion of plants. All plants overexpressing both AlFT and AtFWA flowered earlier than fwa, suggesting that the inflorescence abnormality and earlier flowering time are caused independently. The inflorescence abnormality phenotype was similar to that of the double mutant of ap1 and lfy, and AP1 and LFY genes were down-regulated in the abnormal inflorescences. From these results, we suggest that not only does ectopic AtFWA expression inhibit AtFT/AlFT function to delay flowering but that overexpression of AtFWA and AlFT together inhibits AP1 and LFY function to produce abnormal inflorescences.

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