Photoreceptor Activity Contributes to Contrasting Responses to Shade in Cardamine and Arabidopsis Seedlings
Molina-Contreras, Maria José (Centre de Recerca en Agrigenòmica)
Paulišić, Sandi (Centre de Recerca en Agrigenòmica)
Then, Christiane (Centre de Recerca en Agrigenòmica)
Moreno Romero, Jordi (Centre de Recerca en Agrigenòmica)
Pastor Andreu, Pedro (Centre de Recerca en Agrigenòmica)
Morelli, Luca (Centre de Recerca en Agrigenòmica)
Roig Villanova, Irma (Centre de Recerca en Agrigenòmica)
Jenkins, Huw (University of Oxford)
Hallab, Asis (Max Planck Institute)
Gan, Xiangchao (Max Planck Institute)
Gómez-Cadenas, Aurelio (Universitat Jaume I)
Tsiantis, Miltos (Max Planck Institute)
Rodríguez Concepción, Manuel (Centre de Recerca en Agrigenòmica)
Martínez García, Jaime F. (Centre de Recerca en Agrigenòmica)

Date:	2019
Abstract:	Plants have evolved two major ways to deal with nearby vegetation or shade: avoidance and tolerance. Moreover, some plants respond to shade in different ways; for example, Arabidopsis thaliana undergoes an avoidance response to shade produced by vegetation, but its close relative Cardamine hirsuta tolerates shade. How plants adopt opposite strategies to respond to the same environmental challenge is unknown. Here, using a genetic strategy, we identified the C. hirsuta slender in shade1 (sis1) mutants, which produce strongly elongated hypocotyls in response to shade. These mutants lack the phytochrome A (phyA) photoreceptor. Our findings suggest that C. hirsuta has evolved a highly efficient phyA-dependent pathway that suppresses hypocotyl elongation when challenged by shade from nearby vegetation. This suppression relies, at least in part, on stronger phyA activity in C. hirsuta; this is achieved by increased ChPHYA expression and protein accumulation combined with a stronger specific intrinsic repressor activity. We suggest that modulation of photoreceptor activity is a powerful mechanism in nature to achieve physiological variation (shade tolerance vs. avoidance) for species to colonize different habitats.
Grants:	European Commission 797473 European Commission 237492 Ministerio de Economía y Competitividad BIO2017-85316-R Ministerio de Economía y Competitividad BIO2017-84041-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1211 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-710 Ministerio de Economía y Competitividad SEV-2015-0533
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Published in:	The Plant Cell, Vol. 31 (Nov. 2019) , p. 2649-2663, ISSN 1040-4651

DOI: 10.1105/tpc.19.00275
PMID: 31530733

Post-print 49 p, 1.8 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CRAG (Centre for Research in Agricultural Genomics)
Articles > Research articles
Articles > Published articles