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ARABIDOPSIS TRITHORAX-RELATED3/SET DOMAIN GROUP2 is Required for the Winter-Annual Habit of Arabidopsis thaliana
A specific gene needed for the winter growth habit in Arabidopsis plants
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Abstract
An ATXR3 lesion suppressed the enhanced FLC expression and delayed flowering caused by an active allele of FRI in non-vernalized plants.
- Active alleles of flowering locus C (FLC) and FRIGIDA (FRI) are essential for the winter-annual habit of Arabidopsis thaliana.
- FLC activation by FRI is linked to increased levels of specific histone modifications, including tri-methylation of histone H3 at lysine 4 (H3K4me3).
- Three known H3K4 methyltransferases are involved in FLC activation, but they do not fully suppress FLC expression when mutated.
- ATXR3, a member of a novel class of H3K4 methyltransferases, also contributes to FLC activation.
- The decrease in FLC expression in atxr3 mutants correlates with reduced H3K4me3 levels at the FLC gene.
- ATXR3 is involved in activating other FLC clade members, contributing to the delay in flowering under non-inductive photoperiods.
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