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Descripción
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| Adaptation to local climate involves the synchronization of plant development with the environment, in order to maximize growth and survival. Autumn photoperiod initiates a cascade of physiological and morphological transformations leading to cold acclimation and bud dormancy in poplar trees. These short day (SD)-induced mechanisms of tolerance are very little investigated in woody plants. Transcriptional profiling unraveled the molecular timetable for photoperiodic-dependent induction of poplar growth cessation, cold acclimation and bud set (Ruttink et al., 2007). Among several SD-induced transcriptional regulators, a related to APETALA2 and Viviparous transcription factor, RAV1, was previously characterized in our laboratory as a regulator of poplar seasonal branching (Moreno-Cortes et al., 2012; Moreno-Cortes et al., 2017). Moreover, RAV1 gene expression is also induced by SD and cold (Moreno-Cortes et al., 2012). Therefore, we investigated RAV1 molecular and physiological function during the growth-dormancy transition. Here, we show that RAV1 mediates in the SD-dependent responses to low ambient temperature. Occurrence of leaf injuries correlated with RAV1 levels, increasing in RAV1 kD plants. RNA-seq analyses showed that RAV1 constitutive expression induces poplar orthologs to ETHYLENE RESPONSE FACTOR TYPE VII (ERF72) transcription factor and plasma membrane RESPIRATORY BURST OXIDASE HOMOLOG PROTEIN-LIKE (RbohD), which have been shown to create ROS-dependent tolerance to several abiotic stresses in Arabidopsis (Yao et al., 2017). Additionally, our annual transcriptional profiling showed RAV1, ERF72 and RbohD transcripts are induced in the transition from summer to winter. Thus, we propose that poplar RAV1-ERF72-RbohD module act as a monitoring system for low ambient temperature under short days creating tolerance to cold during growth-dormancy transition. | |
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Internacional
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Si |
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Nombre congreso
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New Frontiers in Plant Biology- III Workshop CBGP |
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Tipo de participación
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970 |
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Lugar del congreso
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Madrid (Spain) |
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Revisores
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Si |
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ISBN o ISSN
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0000000000000 |
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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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33 |
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Hasta la página
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33 |
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Título de las actas
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New Frontiers in Plant Biology |