Artículo
Shade delays flowering in Medicago sativa
Lorenzo, Christian Damián
; Iserte, Javier Alonso
; Sanchez Lamas, Maximiliano
; Antonietti, Mariana Sofía
; Garcia Gagliardi, Pedro; Hernando, Carlos Esteban
; Dezar, Carlos Alberto Alejandro
; Vazquez, Martin; Casal, Jorge José
; Yanovsky, Marcelo Javier
; Cerdan, Pablo Diego
Fecha de publicación:
05/2019
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Plant Journal
ISSN:
0960-7412
e-ISSN:
1365-313X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Shade intolerant plants respond to the decrease in the red (R) to far-red light (FR) ratio (R:FR) occurring under shade by elongating stems and petioles and re-positioning leaves, in a race to out-compete neighbors for the sunlight resource. In some annual species, these shade-avoidance responses (SAS) are accompanied by the early induction of flowering. Anticipated flowering is viewed as a strategy to set seeds before the resources become severely limiting. Little is known about the molecular mechanisms of SAS in perennial forage crops like alfalfa (Medicago sativa). To study SAS in alfalfa, we exposed alfalfa plants to simulated shade by supplementing with FR. Low R:FR produced a classical SAS, such as increased internode and petiole length but, unexpectedly, delayed flowering. To understand the molecular mechanisms involved in uncoupling SAS from early flowering, we used a transcriptomic approach. SAS were likely mediated by increased expression of msPIF3 and msHB2 in low R:FR. Constitutive expression of these genes in Arabidopsis led to SAS, including early flowering, strongly suggesting their roles are conserved. Delayed flowering was likely to be mediated by the downregulation of msSPL3, which promotes flowering in both Arabidopsis and alfalfa. Shade-delayed flowering in alfalfa may be important to extend the vegetative phase under sub-optimal light conditions and thus assure the accumulation of reserves necessary to resume growth after the next season. This article is protected by copyright. All rights reserved.
Palabras clave:
ATHB2
,
FLOWERING
,
ALFALFA
,
PIF3
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - ROSARIO)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - ROSARIO
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - ROSARIO
Articulos(IIBBA)
Articulos de INST.DE INVEST.BIOQUIMICAS DE BS.AS(I)
Articulos de INST.DE INVEST.BIOQUIMICAS DE BS.AS(I)
Citación
Lorenzo, Christian Damián; Iserte, Javier Alonso; Sanchez Lamas, Maximiliano; Antonietti, Mariana Sofía; Garcia Gagliardi, Pedro; et al.; Shade delays flowering in Medicago sativa; Wiley Blackwell Publishing, Inc; Plant Journal; 99; 1; 5-2019; 7-22
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