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Ancestral function but divergent epigenetic regulation of HAiku2 reveals routes of seed developmental evolution

Molecular Plant 2022年第10期15卷 1575-1589页

作者： Di Wu Yiming Wei Xiangyu Zhao Boka Li Huankai Zhang Gang Xu Juntong Lv Dajian Zhang Xiansheng Zhang Min Ni National Key Laboratory of Crop Biology College of Life SciencesShandong Agricultural UniversityTaian 271018China State Key Laboratory of Systematic and Evolutionary Botany CAS Center for Excellence in Molecular Plant SciencesInstitute of BotanyChinese Academy of SciencesBeijing100093China University of Chinese Academy of Sciences Beijing 100049China Department of Plant and Microbial Biology University of Minnesota at Twin CitiesSaint PaulMN 55108USA

Evolution is driven by various mechanisms.A directional increase in the embryo to endosperm ratio is an evolutionary trend within the *** endosperm constitutes a major portion of the seed volume in Poales and some ***,in other dicots such as Arabidopsis and soybean,the endosperm proliferates early,followed by embryo growth to replace the *** Arabidopsis leucine-rich repeat receptor protein kinase AtHAiku2(Atiku2)is a key regulator of early endosperm *** 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 ***2 and soybean Gmiku2 are actively expressed a few days after ***,expression of Atiku2 is suppressed by the FIS-PRC2 complex-mediated *** soybean Gmiku2 locus is also enriched with H3K27me3 *** histone methyltransferase AtMEA is unique to Brassicaceae,but one GmSWN in soybean plays a similar role in seed development as *** contrast,the Bdiku2 and rice Osiku2 loci are continuously expressed and are devoid of H3K27me3 *** 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 *** study reveals an epigenetic mechanism that drives the development of vastly different seed ontogenies.

关键词： Brassicales endosperm Fabales iku2 MEDEA Poales

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Two MADS-box proteins,AGL9 and AGL15,recruit the FIS-PRC2 complex to trigger the phase transition from endosperm proliferation to embryo development in Arabidopsis

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Molecular Plant 2024年第7期17卷 1110-1128页

作者： Shen Zhang Devasantosh Mohanty Adnan Muzaffar Min Ni Department of Plant and Microbial Biology University of Minnesota at Twin CitiesSaint PaulMinnesota MN 55108United States of AmericaUSA

Spatiotemporal regulation of gene expression by polycomb repressive complex 2(PRc2)is critical for animal and plant *** Arabidopsis fertilization independent seed(FIS)-PRC2 complex functions specifically during plant reproduction from gametogenesis to seed *** a double fertilization event,triploid endosperm proliferates early,followed by the growth of a diploid embryo,which replaces the endosperm in Arabidopsis and many *** genes critical for endosperm proliferation such as IKkU2 and MINI3 are activated after *** we report that two MADS-box AGAMOUS-LIKE(AGL)proteins associate with the key endosperm proliferation loci and recruit the FIS-PRC2 repressive complex at 4-5 days after pollination(DAP).Interestingly,AGL9 and AGL15 only accumulate toward the end of endosperm proliferation at 4-5 DAP and promote the deposition of H3K27me3 marks at key endosperm proliferation *** of AGL9 and AGL15 or overexpression of AGL9 or AGL15 significantly influence endosperm proliferation and ***-wide analysis with cleavage Under Targets and tagmentation(CUT&Tag)sequencing and RNA sequencing revealed the landscape of endosperm H3K27me3 marks and gene expression profiles in Col-0 and agl9 ***&Tag qPCR also demonstrated the occupancy of the two MADS-box proteins and FIS-PRC2 on a few representative target *** studies suggest that MADS-box proteins could potentially recruit PRc2 to regulate many other developmental processes in plants or even in fungi and animals.

关键词： AGL9 AGL15 embryo endosperm iku2 MEDEA MINI3

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