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Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	22/01/2020	
Fecha de la última actualización: 	24/02/2022	
Autoria: 	LADO, J.; ALÓS, E.; MANZI, M.; CRONJE, P.J.R.; GÓMEZ-CADENAS, A.; RODRIGO, M.J.; ZACARÍAS, L.	
Afiliación: 	JOANNA LADO LINDNER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Spain; ENRIQUETA ALÓS, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Spain; MATÍAS MANZI, Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, Spain; Estación Experimental Facultad de Agronomía Salto (EEFAS), Universidad de la Republica, Salto, Uruguay; PAUL J. R. CRONJE, Citrus Research International, Department of Horticultural Science, University of Stellenbosch, South Africa; AURELIO GÓMEZ-CADENAS, Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, Spain; MARÍA J. RODRIGO, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Spain; LORENZO ZACARÍAS, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Spain.	
Título: 	Light regulation of carotenoid biosynthesis in the peel of mandarin and sweet orange fruits.	
Año de publicación: 	2019	
Fuente/Imprenta: 	Frontiers in Plant Science, 15 October 2019, Volume 10, Article number 1288. OPEN ACCESS. Doi: 10.3389/fpls.2019.01288	
ISSN: 	1664-462X	
DOI: 	10.3389/fpls.2019.01288	
Idioma: 	Inglés	
Notas: 	Article history: Received: 14 June 2019 / Accepted: 17 September 2019 / Published: 15 October 2019.
Funding text: MR and LZ are members of Eurocaroten (COST_Action CA15136) and CaRed (Spanish Carotenoid Network BIO2017-90877-REDT, Ministerio de Ciencia, Innovación y Universidades, Spain).
This article is part of the research topic "Illuminating Carotenoid Synthesis and Plastid Transition in Plants".	
Contenido: 	ABSTRACT.
Carotenoids are the pigments responsible for the coloration of the peel and pulp of Citrus fruits. Light is one of the major environmental factors influencing coloration and carotenoid content and composition of fleshy fruits and therefore their commercial and nutritional quality. Agronomical observations indicate that citrus fruits exposed to sunlight develop a brighter peel coloration than shaded fruit inside the tree canopy. In the present study, the effect of light deprivation on carotenoid profile, and in the expression of genes of carotenoid metabolism and their precursors have been analyzed in fruits of Clemenules mandarin (Citrus clementine) and Navelina orange (Citrus sinensis). Fruit shading accelerated peel degreening, chlorophyll degradation, and reduced chloroplastic-type carotenoids. Time-course shading experiments revealed that the stage of fruit ripening appears to be determinant for the effect of darkness in carotenoid biosynthesis. Fruit shading produced a down-regulation of the expression of key carotenoids biosynthetic genes (PSY, PDS, ZDS1, LCY2a, LCY2b, and CHX). However, expression of MEP pathway genes (DXS, HDR1, and GGPPS1) and the carotenoid cleavage dioxygenase, CCD4b1, responsible of the formation of the apocarotenoid ?-citraurin, were not substantially affected by dark-grown conditions. The content of abscisic acid (ABA), an end product of the carotenoid pathway, was not affected by the light regime, suggesting that effect of shading on the precursor?s pool is not sufficient to impair ABA synthesis. A moderate increase in total carotenoid and in the expression of biosynthetic genes was observed in mature dark-grown mandarin and orange fruits. Collectively, results suggest that light stimulates carotenoid biosynthesis in the peel of citrus fruits but a light-independent regulation may also operate. 
© Copyright © 2019 Lado, Alós, Manzi, Cronje, Gómez-Cadenas, Rodrigo and Zacarías.	
Palabras-Clave: 	ABSCISIC ACID; CAROTENOIDS; CITRUS FRUIT; GENE EXPRESSION; LIGHT; MATURATION; PLATAFORMA AGROALIMENTOS.	
Thesagro: 	CITRUS.	
Categoría del tema: 	F01 Cultivo	
URL: 	https://www.frontiersin.org/articles/10.3389/fpls.2019.01288/pdf	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (102101-1) - PXI - AP - DD - PP/Front. Plant Sci./2019 -  -  - DIS