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Your search keyword '"Xiansheng Zhang"' showing total 2 results
Start Over Author "Xiansheng Zhang" Topic endosperm
2 results on '"Xiansheng Zhang"'

1. Ancestral function but divergent epigenetic regulation of HAIKU2 reveals routes of seed developmental evolution

Author

Di Wu, Yiming Wei, Xiangyu Zhao, Boka Li, Huankai Zhang, Gang Xu, Juntong Lv, Dajian Zhang, Xiansheng Zhang, and Min Ni

Subjects
Arabidopsis Proteins, Arabidopsis, Oryza, Plant Science, Endosperm, Epigenesis, Genetic, Histones, Gene Expression Regulation, Plant, Leucine, Seeds, Histone Methyltransferases, Soybeans, Molecular Biology, Protein Kinases
Abstract

Evolution is driven by various mechanisms. A directional increase in the embryo to endosperm ratio is an evolutionary trend within the angiosperms. The endosperm constitutes a major portion of the seed volume in Poales and some dicots. However, in other dicots such as Arabidopsis and soybean, the endosperm proliferates early, followed by embryo growth to replace the endosperm. The Arabidopsis leucine-rich repeat receptor protein kinase AtHAIKU2 (AtIKU2) is a key regulator of early endosperm proliferation. In this study, we found that IKU2s from Brachypodium, rice, and soybean can complement the abnormal seed developmental phenotype of Atiku2, while AtIKU2 also rescues the defective endosperm proliferation in the Brachypodium BdIKU2 knockout mutant seeds. AtIKU2 and soybean GmIKU2 are actively expressed a few days after fertilization. Thereafter, expression of AtIKU2 is suppressed by the FIS-PRC2 complex-mediated H3K27me3. The soybean GmIKU2 locus is also enriched with H3K27me3 marks. The histone methyltransferase AtMEA is unique to Brassicaceae, but one GmSWN in soybean plays a similar role in seed development as AtMEA. By contrast, the BdIKU2 and rice OsIKU2 loci are continuously expressed and are devoid of H3K27me3 marks. Taken together, these results suggest that IKU2 genes retain an ancestral function, but the duration of their expression that is controlled by PRC2-mediated epigenetic silencing contributes to silenced or persistent endosperm proliferation in different species. Our study reveals an epigenetic mechanism that drives the development of vastly different seed ontogenies.

Published
2022

2. SHORT HYPOCOTYL UNDER BLUE1 Associates with MINISEED3 and HAIKU2 Promoters in Vivo to Regulate Arabidopsis Seed Development.

Author

Yun Zhou, Xiaojuan Zhang, Xiaojun Kang, Xiangyu Zhao, Xiansheng Zhang, and Min Ni

Subjects
SEED development, ARABIDOPSIS thaliana, ENDOSPERM, GERMINATION, GENE expression in plants, TRANSCRIPTION factors, PROMOTERS (Genetics)
Abstract

Seed development in Arabidopsis thaliana undergoes an initial phase of endosperm proliferation followed by a second phase in which the embryo grows at the expense of the endosperm. As mature seed size is largely attained during the initial phase, seed size is coordinately determined by the growth of the maternal ovule, endosperm, and embryo. Here, we identify SHORT HYPOCOTYL UNDER BLUE1 (SHB1) as a positive regulator of Arabidopsis seed development that affects both cell size and cell number, shb1-D, a gain-of-function overexpression allele, increases seed size, and shbl, a loss-of-function allele, reduces seed size. SHB1 is transmitted zygotically. The increase in shb1-D seed size is associated with endosperm cellurization, chalazal endosperm enlargement, and embryo development. SHB1 is required for the proper expression of two other genes that affect endosperm development, MINISEED3 (MINI3) and HAIKU2 (IKU2), a WRKY transcription factor gene and a leucine-rich repeat receptor kinase gene. SHB1 associates with both MINI3 and IKU2 promoters in vivoo SHB1 may act with other proteins that bind to MINI3 and IKU2 promoters to promote a large seed cavity and endosperm growth in the early phase of seed development. In the second phase, SHB1 enhances embryo cell proliferation and expansion through a yet unknown IKU2-independent pathway. [ABSTRACT FROM AUTHOR]

Published
2009
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