HSI2/VAL1 and HSL1/VAL2 function redundantly to repress DOG1 expression in Arabidopsis seeds and seedlings.

Published on Aug 1, 2020in New Phytologist10.152
· DOI :10.1111/NPH.16559
Naichong Chen5
Estimated H-index: 5
(OSU: Oklahoma State University–Stillwater),
Hui Wang10
Estimated H-index: 10
(OSU: Oklahoma State University–Stillwater)
+ 3 AuthorsRandy D. Allen38
Estimated H-index: 38
(OSU: Oklahoma State University–Stillwater)
Sources
Abstract
DELAY OF GERMINATION1 (DOG1) is a primary regulator of seed dormancy. Accumulation of DOG1 in seeds lead to deep dormancy and delayed germination in Arabidopsis. B3 domain-containing transcriptional repressors HSI2/VAL1 and HSL1/VAL2 silence seed dormancy and enable the subsequent germination and seedling growth. However, the roles of HSI2 and HSL1 in regulation of DOG1 expression and seed dormancy remain elusive. Seed dormancy was analyzed by measurement of maximum germination percentage of freshly harvested Arabidopsis seeds. In vivo protein-protein interaction analysis, ChIP-qPCR and EMSA were performed and suggested that HSI2 and HSL1 can form dimers to directly regulate DOG1. HSI2 and HSL1 dimers interact with RY elements at DOG1 promoter. Both B3 and PHD-like domains are required for enrichment of HSI2 and HSL1 at the DOG1 promoter. HSI2 and HSL1 recruit components of polycomb-group proteins, including CURLY LEAF (CLF) and LIKE HETERCHROMATIN PROTEIN 1 (LHP1), for consequent deposition of H3K27me3 marks, leading to repression of DOG1 expression. Our findings suggest that HSI2- and HSL1-dependent histone methylation plays critical roles in regulation of seed dormancy during seed germination and early seedling growth.
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Polycomb repressive complex 2 (PRC2) catalyzes repressive histone 3 lysine-27 trimethylation (H3K27me3) to mediate genome-wide transcriptional repression in plants and animals. PRC2 controls various developmental processes in plants and plays a critical role in the developmental transition to flowering. FLOWERING LOCUS C (FLC), first identified in Arabidopsis (Arabidopsis thaliana), is a potent floral repressor in crucifers and some other plants that is subjected to complex regulation. Here, we ...
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The time of seed germination is a major decision point in the life of plants determining future growth and development. This timing is controlled by seed dormancy, which prevents germination under favourable conditions. The plant hormone abscisic acid (ABA) and the protein DELAY OF GERMINATION 1 (DOG1) are essential regulators of dormancy. The function of ABA in dormancy is rather well understood, but the role of DOG1 is still unknown. Here, we describe four phosphatases that interact with DOG1 ...
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