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Descripción
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| Survival of perennial plants heavily relies on synchronization of seasonal rhythms of growth and development with the environmental cues [1]. Photoperiodic signaling promotes growth cessation and cold acclimation in poplar, however, the mechanisms for plant adaptation to a seasonal drop of ambient temperature have yet to be determined [2;3]. In this work, we show that the hybrid poplar transcription factor RELATED to ABI3 and VIVIPAROUS 1 (RAV1) is upregulated during early autumn and also in controlled conditions of short day (SD) and low ambient temperature. Transient RAV1 activation causes a massive transcriptional remodeling of genes resembling the signaling occurring during plant response to multiple environmental stresses. Autumnal signals of SD and low ambient temperature promote induction of transcriptional module formed by RAV1 and its target genes RESPIRATORY BURST OXIDASE HOMOLOG D1 (RbohD1) and ETHYLENE RESPONSE FACTOR 72-1 (ERF72-1), homologs to Arabidopsis regulators of reactive oxygen species (ROS) signaling. Constitutive RAV1 expression improves hybrid poplar growth performance under short day and low ambient temperature conditions. RAV1 overexpressing lines (RAV1oe) show increased levels of stomatal conductance, photosynthesis, and biomass than wild-type and RAV1 knock down (RAV1kd) plants. This is caused by higher stomatal responsiveness provoked by increased ROS burst in stomatal guard cells in RAV1oe lines. We propose that the autumnal induction of RAV1 creates a molecular alert status towards seasonal environmental variations contributing to poplar adaptation to autumnal drops of ambient temperature. | |
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Internacional
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Si |
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Nombre congreso
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Keystone Symposia on Molecular and Cellular Biology-Climate Change-Linked Stress Tolerance in Plants |
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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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0000000000 |
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DOI
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Fecha inicio congreso
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13/05/2019 |
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Fecha fin congreso
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16/05/2019 |
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Desde la página
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0 |
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Hasta la página
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0 |
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Título de las actas
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Climate Change-Linked Stress Tolerance in Plants |