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Descripción
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| Plants require mechanisms to modify the physical properties of their cell walls according to tissue-specific growth rates and developmental stages as well as in response to environmental cues. Seed germination is an excellent system to study growth regulatory mechanisms since the developmental transition from seed to seedling is driven exclusively by cell shape change in the absence of cell division (1,2). So far, it is well known that seed germination requires endosperm weakening, which is associated with gibberellins (GAs) and the coordinated expression of cell-wall remodelling enzymes (CWREs; 3). Here, we demonstrate that endosperm not only facilitates seed germination but is also essential to ensure radicle integrity. Additionally, we show a detailed study of a molecular mechanism underlying endosperm cell expansion. By phylogenomic analyses of gene promoters (4), we have identified and characterized upstream regulators of an endosperm CWRE marker gene (ECMG) reaching the following conclusions: i) The identified regulators integrate GA-signalling in the seed endosperm and are transcriptional activators of ECMG expression; ii) they control the expression of additional CWRE genes putatively involved in endosperm cell growth; iii) their regulatory roles only overlap partially, since single loss of function (KOs) mutants present a decrease in CWREs expression, reduced endosperm cell expansion and delayed testa rupture. Currently, we are studying to what extent this mechanism has been recruited by other developmental stages and/or plant species to control growth, as well as studying the integration of environmental signals into this regulation. | |
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Internacional
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Si |
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Nombre congreso
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Workshop Frontiers in Plant Biology |
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Tipo de participación
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970 |
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Lugar del congreso
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Revisores
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Si |
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ISBN o ISSN
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0000-0000 |
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DOI
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Fecha inicio congreso
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30/05/2018 |
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Fecha fin congreso
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01/06/2018 |
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Desde la página
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29 |
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Hasta la página
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29 |
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Título de las actas
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0000-0000 |