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H3K27 tri-methyltransferases CLF and SWN redundantly buffer ABA-induced senescence

ABSTRACT: The phytohormone abscisic acid (ABA) induces senescence and facilitates nutrient reuse, which are essential for increasing stress tolerance. Senescence controls plant aging and is closely associated with crop yield and quality. It is a complicated process finely tuned by multiple layers of control. A significant proportion of ABA-responsive genes and cis-elements are targeted by H3K27me3 modification that is mediated by Polycomb group proteins (PcGs); however, the interplay between the major epigenetic machinery and the central stress hormone is poorly understood. Both pathways influence the transcription of thousands of genes, and the dynamic and quantitative epigenomic and transcriptomic changes cannot be characterized with high confidence. This issue is further complicated by the redundant roles of PcG components. This article revealed an intriguing mechanism of the interplay between ABA and PcG in regulating plant senescence, based on the integration of genetic evidence and quantitative comparison of epigenomic data derived from a purpose-developed computational model. We observed that >30% of ABA-induced genes are up-regulated in a double mutant of H3K27me3 methyltransferases CLF and SWN; and the double mutant, but not single-gene mutants, is hyper-sensitive to ABA treatment. Importantly, ABA-triggered H3K27me3 reduction preferentially occurred in regions around senescence-associated genes (SAGs), which are redundantly repressed by CLF and SWN in normal conditions. Furthermore, we revealed that the presence of H3K27me3 surrounding SAGs does not block ABA-induced SAG expression, but rather limits the extent of the induction, thereby preventing an over-sensitive response within a dynamic environment. These findings may serve as a paradigm for the crosstalk between the rapid-effect of phytohormone and the long-term effect of epigenetic machinery in regulating plant environmental responses through modulations of the senescence process. Overall design: Arabidopsis thaliana seedlings were grown on 1/2 Murashige and Skoog (MS) medium without sucrose (2% agar, PH 5.8) under LDs conditions. clf-50swn-1 is in the Ws background. For ABA treatment, 10-d old seedlings were transferred onto 1/2 MS medium containing 50 uM ABA or 100 uM ABA. After 4 days' treatment, the aerial parts were harvested, either frozen in liquid nitrogen for RNA isolation or directly vacuum-infiltrated with formaldehyde crosslinking solution for ChIP assay.

INSTRUMENT(S): Illumina HiSeq 2500 (Arabidopsis thaliana)

SUBMITTER: yijing zhang  

PROVIDER: GSE98301 | GEO | 2018-12-14


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Polycomb repressive complex 2 attenuates ABA-induced senescence in Arabidopsis.

Liu Chunmei C   Cheng Jingfei J   Zhuang Yili Y   Ye Luhuan L   Li Zijuan Z   Wang Yuejun Y   Qi Meifang M   Xu Lin L   Zhang Yijing Y  

The Plant journal : for cell and molecular biology 20181128 2

The phytohormone abscisic acid (ABA)-induced leaf senescence facilitates nutrient reuse and potentially contributes to enhancing plant stress tolerance. However, excessive senescence causes serious reductions in crop yield, and the mechanism by which senescence is finely tuned at different levels is still insufficiently understood. Here, we found that the double mutant of core enzymes of the polycomb repressive complex 2 (PRC2) is hypersensitive to ABA in Arabidopsis thaliana. To elucidate the i  ...[more]

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