A Regulatory Module Controlling CA-Mediated Endosperm Cell Expansion Is Critical for Seed Germination in Arabidopsis

查看全文 作　　者：Rocio Sanchez-[1]Montesino;Laura Bouza-[1]Morcillo;Julietta [2]Marquez;Melania [2]Ghita;Salva Duran-[3]Nebreda;Luis [1,4]Gomez;Michael [2]J.Holdsworth;George [3]Bassel;Luis Onate-[1]Sanchez

机构地区：[1]Centro de Biotecnologia y Genomica de Plantas,Universidad Politecnica de Madrid-lnstituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria, Campus de Montegancedo,Pozuelo de Alarcon,Maddd 28223,Spain;[2]School of Biosciences,University of Nottingham,Loughborough LE12 5RD,UK;[3]School of Biosciences,University of Birmingham,Birmingham B15 23-r,UK;[4]Departamento de Sistemas y Recursos Naturales,E.T.S.I.Montes,Forestal y del Medio Natural,Campus de Moncloa,28040 Madrid,Spain

出　　处：《Molecular Plant》索引2019年第12卷第1期,共15页

摘　　要：A key component of seed germination is the interplay of mechanical forces governing embryo growth and the surrounding restraining endosperm tissue.Endosperm cell separation is therefore thought to play a critical role in the control of this developmental transition.Here we demonstrate that in Arabidopsis thaliana seeds,endosperm cell expansion is a key component of germination.Endosperm cells expand to accommodate embryo growth prior to germination.We show that this is an actively regulated process supported by spatiotemporal control of the cell expansion gene EXPANSIN 2 (EXPA2).The NAC transcription factors NAC25 and NACIL were identified as upstream regulators of EXPA2 expression,gibbereliinmediated endosperm expansion,and seed germination.The DELLA protein RGL2 repressed activation of the EXPA2 promoter by NAC25/NACIL.Taken together,our findings uncover a key role of the GA/ DELLA-NAC25/NACIL-EXPA2 network in regulating endosperm cell expansion to control the seed-toseedling transition. 关键词：cell expansion CELL-WALL REMODELING enzymes ENDOSPERM EXPANSIN NAC transcription factors seed GERMINATION

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A Regulatory Module Controlling CA-Mediated Endosperm Cell Expansion Is Critical for Seed Germination in Arabidopsis

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