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Descripción
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| Seed germination is a crucial process in spermatophytes with an impact on crop establishment and yield. This process depends on hormonal regulation, being abscisic acid (ABA) and gibberellins (GAs) key regulators playing antagonistic roles. Several environmental factors may compromise seed germination and plant growth, mainly through the regulation of ABA-GA metabolism and signalling pathways (Colebrook et al., 2014). By screening a seed library (Weiste et al., 2007) we have identified Arabidopsis lines constitutively overexpressing the single transcription factor LID1 (light-in-darkness1) with improved germination under conditions known to decrease GA biosynthesis (paclobutrazol; PAC). Whereas this phenotype is compatible with enhanced GA levels/signalling or reduced ABA sensitivity, the overexpression lines (LID1oex) show reduced germination in the presence of ABA and drought-like conditions (high mannitol levels) known to increase ABA levels. Loss-of-function lid1 mutants show opposite phenotypes, with reduced germination in the presence of PAC and enhanced germination in ABA and mannitol, thus pointing to a possible role of LID1 in GA-ABA crosstalk. Light is known to influence ABA-GA balance and growth (de Lucas et al., 2008; Feng et al., 2008; Oh et al., 2009), and lid1 mutants germinate in the dark more rapidly than WT seeds. Under light conditions, they also germinate and develop into photomorphogenic seedlings more quickly than WT plants. Molecular studies indicate that LID1 is expressed specifically in the seed, is a transcriptional repressor and interacts with DELLA proteins. Our molecular studies indicate that LID1 is a novel regulator integrating light and growth responses in seeds with a promising biotechnological potential. | |
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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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137 |
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Hasta la página
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137 |
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Título de las actas
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0000-0000 |