HSI2/VAL1 Silences AGL15 to Regulate the Developmental Transition from Seed Maturation to Vegetative Growth in Arabidopsis

The Plant Cell
Naichong ChenRandy D Allen

Abstract

Gene expression during seed development in Arabidopsis thaliana is controlled by transcription factors including LEAFY COTYLEDON1 (LEC1) and LEC2, ABA INSENSITIVE3 (ABI3), FUSCA3 (FUS3), known as LAFL proteins, and AGAMOUS-LIKE15 (AGL15). The transition from seed maturation to germination and seedling growth requires the transcriptional silencing of these seed maturation-specific factors leading to downregulation of structural genes including those that encode seed storage proteins, oleosins, and dehydrins. During seed germination and vegetative growth, B3-domain protein HSI2/VAL1 is required for the transcriptional silencing of LAFL genes. Here, we report chromatin immunoprecipitation analysis indicating that HSI2/VAL1 binds to the upstream sequences of the AGL15 gene but not at LEC1, ABI3, FUS3, or LEC2 loci. Functional analysis indicates that the HSI2/VAL1 B3 domain interacts with two RY elements upstream of the AGL15 coding region and at least one of them is required for HSI2/VAL1-dependent AGL15 repression. Expression analysis of the major seed maturation regulatory genes LEC1, ABI3, FUS3, and LEC2 in different genetic backgrounds demonstrates that HSI2/VAL1 is epistatic to AGL15 and represses the seed maturation regulator...Continue Reading

Citations

Sep 6, 2018·The FEBS Journal·Giedrius SasnauskasVirginijus Siksnys
Nov 22, 2018·Plant & Cell Physiology·Thomas James RoscoeMartine Devic
Jan 29, 2019·The New Phytologist·Jiqing GouZeng-Yu Wang
Dec 13, 2019·Journal of Integrative Plant Biology·Xiao Luo, Yuehui He
Aug 29, 2018·International Journal of Molecular Sciences·Soulaiman SakrRossitza Atanassova
Nov 6, 2018·Frontiers in Plant Science·Dong-Hong ChenJin-Ping Si
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Oct 13, 2020·The Biochemical Journal·Ran TianSharyn E Perry
Oct 14, 2020·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Demissew SertseSylvie Cloutier
Jul 24, 2021·Trends in Plant Science·Tomasz BieluszewskiDoris Wagner
Aug 4, 2021·Current Opinion in Plant Biology·Milad AlizadehLiang Song
Jun 28, 2021·Journal of Experimental Botany·Baojian ChenKim Boutilier

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