Photoreceptor Activity Contributes to Contrasting Responses to Shade in Cardamine and Arabidopsis Seedlings

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 t...

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Detalles Bibliográficos
Autores: Molina-Contreras, Maria José, Paulisic, Sandi|||0000-0003-4696-5134, Then, Christiane|||0000-0001-8867-7080, Moreno-Romero, Jordi|||0000-0002-7352-1507, Pastor Andreu, Pedro|||0000-0001-6320-0569, Morelli, Luca|||0000-0002-9968-0012, Roig Villanova, Irma|||0000-0001-9124-0429, Jenkins, Huw, Hallab, Asis, Gan, Xiangchao|||0000-0001-6398-5191, Gómez-Cadenas, Aurelio, Tsiantis, Miltos|||0000-0001-7150-1855, Rodríguez Concepción, Manuel|||0000-0002-1280-2305, Martínez-García, Jaume F.|||0000-0003-1516-0341
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:214181
Acceso en línea:https://ddd.uab.cat/record/214181
https://dx.doi.org/urn:doi:10.1105/tpc.19.00275
Access Level:acceso abierto
Descripción
Sumario: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.

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