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Descripción
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| 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 (Rombolá-Caldentey et al., 2014; Sliwinska et al., 2009). It is well known that seed germination requires endosperm weakening and embryo elongation growth, which are associated with gibberellins (GAs) and the coordinated expression of cell-wall remodelling enzymes (CWREs; Holdsworth et al., 2008). Here, we describe a GA dependent mechanism promoting endosperm cell growth during germination, which coincides with radicle growth, and demonstrate that endosperm not only facilitates seed germination but is also essential to ensure radicle integrity. By phylogenomic analyses of gene promoters (Castrillo et al., 2011), we have identified and characterized upstream regulators of an endosperm CWRE marker gene (ECMG) that integrate GA-signalling in the seed endosperm and are transcriptional activators of ECMG expression and other CWRE genes putatively involved in endosperm cell growth. 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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XIV Reunión de Biología Molecular de Plantas |
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Tipo de participación
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970 |
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Lugar del congreso
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Salamanca |
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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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04/07/2018 |
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Fecha fin congreso
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06/07/2018 |
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Desde la página
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94 |
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Hasta la página
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94 |
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Título de las actas
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0000-0000 |