Jumonji demethylases moderate precocious flowering at elevated temperature via regulation of FLC in Arabidopsis

Eng-Seng Gan, Yifeng Xu, Jie-Yun Wong, Jessamine Geraldine Goh, Bo Sun, Wan-Yi Wee, Jiangbo Huang and Toshiro Ito ()
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Eng-Seng Gan: Temasek Life Sciences Laboratory (TLL), 1 Research Link, National University of Singapore
Yifeng Xu: Temasek Life Sciences Laboratory (TLL), 1 Research Link, National University of Singapore
Jie-Yun Wong: Temasek Life Sciences Laboratory (TLL), 1 Research Link, National University of Singapore
Jessamine Geraldine Goh: Temasek Life Sciences Laboratory (TLL), 1 Research Link, National University of Singapore
Bo Sun: Temasek Life Sciences Laboratory (TLL), 1 Research Link, National University of Singapore
Wan-Yi Wee: Temasek Life Sciences Laboratory (TLL), 1 Research Link, National University of Singapore
Jiangbo Huang: Temasek Life Sciences Laboratory (TLL), 1 Research Link, National University of Singapore
Toshiro Ito: Temasek Life Sciences Laboratory (TLL), 1 Research Link, National University of Singapore

Nature Communications, 2014, vol. 5, issue 1, 1-13

Abstract: Abstract As sessile organisms, plants have evolved multiple mechanisms to respond to environmental changes to improve survival. Arabidopsis plants show accelerated flowering at increased temperatures. Here we show that Jumonji-C domain-containing protein JMJ30 directly binds to the flowering-repressor FLOWERING LOCUS C (FLC) locus and removes the repressive histone modification H3 lysine 27 trimethylation (H3K27me3). At elevated temperatures, the JMJ30 RNA and protein are stabilized, and FLC expression is maintained at high levels to prevent extreme precocious flowering. The double mutant of JMJ30 and its homologue JMJ32, grown at elevated temperatures, exhibits an early-flowering phenotype similar to the flc mutant, which is associated with increased H3K27me3 levels at the FLC locus and decreased FLC expression. Furthermore, ectopic expression of JMJ30 causes an FLC-dependent late-flowering phenotype. Taken together, JMJ30/JMJ32-mediated histone demethylation at the FLC locus constitutes a balancing mechanism in flowering control at warm temperatures to prevent premature early flowering.

Date: 2014
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DOI: 10.1038/ncomms6098

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