The floral repressors TEMPRANILLO1 and 2 modulate salt tolerance by regulating hormonal components and photo-protection in Arabidopsis
Osnato, Michela (Centre de Recerca en Agrigenòmica)
Cereijo, Unai (Centre de Recerca en Agrigenòmica)
Sala, Jan (Centre de Recerca en Agrigenòmica)
Matías Hernández, Luis (Centre de Recerca en Agrigenòmica)
Aguilar Jaramillo, Andrea Elizabeth (Centre de Recerca en Agrigenòmica)
Rodríguez-Goberna, María Rosa (Centre de Recerca en Agrigenòmica)
Riechmann, José Luis (Centre de Recerca en Agrigenòmica)
Rodríguez Concepción, Manuel (Centre de Recerca en Agrigenòmica)
Pelaz, Soraya (Centre de Recerca en Agrigenòmica)

Date:	2021
Abstract:	Members of the plant specific RAV family of transcription factors regulate several developmental and physiological processes. In the model plant Arabidopsis thaliana, the RAV TEMPRANILLO 1 (TEM1) and TEM2 control important phase changes such as the juvenile to adult and the vegetative to reproductive transitions. Besides their known regulatory function in plant development, a transcriptomics analysis of transgenic plants overexpressing TEM1 also revealed over-representation of GO categories related to abiotic stress response. Therefore, to investigate the biological relevance of these TEM-dependent transcriptomic changes and elucidate whether TEM contribute to the modulation of plant growth in response to salinity, we analysed the behavior of TEM gain and loss of function mutants subjected to mild and high salt stresses at different development stages. With respect to increasing salinity, TEM over-expressing plants were hypersensitive whereas the tem1 tem2 double mutants were more tolerant. Precisely, tem1 tem2 mutants germinated and flowered faster than the wild type plants under salt stress conditions. Also, tem1 tem2 plants showed a delay in salt-induced leaf senescence, possibly as a consequence of down-regulation of Jasmonic Acid (JA) biosynthetic genes. Besides a shorter life cycle and delayed senescence, tem1 tem2 mutants appeared to be better suited to withstand oxidative stress as they accumulated higher levels of -tocopherol (an important antioxidant metabolite) and displayed a slower degradation of photosynthetic pigments. Taken together, our studies suggest novel and crucial roles for TEM in adaptive growth as they modulate plant development in response to environmental changes such as increasing soil salinity.
Grants:	Ministerio de Economía y Competitividad BFU2015-64409-P Ministerio de Ciencia e Innovación PCG2018-095804B-I00 Ministerio de Economía y Competitividad BFU2014-58289-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-718 Ministerio de Economía y Competitividad SEV-2015-0533
Note:	Altres ajuts: CERCA Programme/Generalitat de Catalunya
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Abiotic stress ; Arabidopsis thaliana ; Flowering time ; Plant development ; Plant physiology ; RAV genes ; Salt tolerance ; TEMPRANILLO
Published in:	The Plant journal, Vol. 105, Issue 1 (January 2021) , p. 7-21, ISSN 1365-313X

DOI: 10.1111/tpj.15048

Article. Postprint 36 p, 17.2 MB	Figures 10 p, 1.6 MB	Supplement Table 1. Arxiu xlsx 14.6 KB	Supplement Table 2. Arxiu xlsx 41.4 KB	Supplement Table 3. Arxiu xlsx 13.2 KB	Supplement Table 4. Arxiu xlsx 178.5 KB
Supplement data. Arxiu xlsx 586.4 KB

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