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Descripción
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| Fine-tuning of environmental signals maximises plant growth and guarantees their survival. When photoperiod falls below a critical day-length, poplar ceases growth and initiates a cascade of physiological and morphological transformations leading to bud set and cold acclimation (Triozzi et al., 2018). Therefore, seasonal regulation of molecular switches integrating environmental changes and driving plant responses is necessary. A related to ABI3/VP1 transcription factor, RAV1, shows a strong induction during dormancy- promoting conditions. Therefore, we investigated the role of RAV1 during the growth- dormancy transition. In this work, we show that poplar responses to low ambient temperature under short day (SD) depend on RAV1 induction. RNA-seq analyses showed that RAV1 activates poplar orthologs to Ethylene response factor 72 (ERF72) and plasma membrane Respiratory burst oxidase homolog protein F (RbohD) which have been shown to create ROS-dependent tolerance to abiotic stress in Arabidopsis (Yao et al., 2017). According to this, after 6 weeks under SD and 15°C, higher percentage of RAV1 knock down (RAV1kd) transgenic plants showed wilted leaves and delayed bud set compared to wild type (WT) and RAV1 overexpressing (RAV1oe) transgenic plants. Moreover, RAV1oe plants were able to close stomata faster than WT and RAV1kd plants, suggesting RAV1 is required for poplar adaptation to low ambient temperature under SD by inducing stomatal closure via RbohD. Additionally, low ambient temperature induces RAV1, ERF72 and RbohD gene expression. Thus, we propose that RAV1-ERF72-RbohD module acts as a system to monitor low ambient temperature under SD contributing to the adaptation of plant during growth-dormancy transition in poplar. | |
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Internacional
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Si |
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Nombre congreso
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The Coordination of Development- Sainsbury Laboratory Symposium |
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Tipo de participación
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960 |
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Lugar del congreso
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Cambridge (UK) |
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Revisores
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Si |
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ISBN o ISSN
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000-00-0000-000-0 |
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DOI
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Fecha inicio congreso
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19/09/2018 |
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Fecha fin congreso
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21/09/2018 |
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1 |
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1 |
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Título de las actas
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The Coordination of Development- |