Fecha/hora: 20/05/2024 04:23:35

Biblioteca(s): 	INIA Las Brujas; INIA Treinta y Tres.	
Fecha corriente: 	11/09/2014	
Fecha de la última actualización: 	04/11/2019	
Autoria: 	BONNECARRERE, V.; BORSANI, O.; DIAZ, P.; CAPDEVIELLE, F.; BLANCO, P.H.; MONZA, J.	
Afiliación: 	MARIA VICTORIA BONNECARRERE MARTINEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; PAOLA ALEXANDRA DIAZ DELLAVALLE, Instituto Nacional de Investigación Agropecuaria (INIA), Uruguay; FABIAN MARCEL CAPDEVIELLE SOSA, Instituto Nacional de Investigación Agropecuaria (INIA), Uruguay; PEDRO HORACIO BLANCO BARRAL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Response to photoxidative stress induced by cold in japonica rice is genotype dependent.	
Año de publicación: 	2011	
Fuente/Imprenta: 	Plant Science, 2011, 180 (5): 726-732.	
Volumen: 	180	
Páginas: 	p.726-732	
ISSN: 	0168-9452	
DOI: 	10.1016/j.plantsci.2011.01.023	
Idioma: 	Inglés	
Notas: 	Article history: received 25 November 2010; received in revised form 27 January 2011; accepted 31 January 2011; available online 15 February 2011.	
Contenido: 	ABSTRACT.

Two japonica rice genotypes, INIA Tacuarí and L2825CA, were analyzed for tolerance to low temperature during early vegetative growth. Effect on photosynthesis, energy dissipation, pigment content, xanthophyll-cycle pool conversion, hydrogen peroxide accumulation, oxidative damage and antioxidant enzyme activities were determined to better understand potential mechanisms for cold tolerance. Photoinhibition was measured using chlorophyll fluorescence and oxidative damage by lipid peroxidation and electrolyte leakage. Both genotypes were demonstrated to be cold tolerant which was consistent with their reduced levels of photoinhibition and oxidative damage compared with a cold-sensitive genotype during chilling stress. The strategy for cold tolerance differed between the two genotypes, and involved different mechanisms for disposal of excess energy. The presence of high lutein concentrations and the existence of active non-harmful energy dissipation processes through the xanthophyll cycle appeared to be responsible for chilling tolerance in INIA Tacuarí. On the other hand, increased cold tolerance of L2825CA relative to INIA Tacuarí was related to the higher constitutive superoxide dismutase (SOD, EC 1.15.1.1), ascorbate peroxidase (APX, EC 1.11.1.11) and catalase (CAT, EC 1.11.1.6).	
Palabras-Clave: 	ANTIOXIDANT ENZYMES; CHILLING; ENERGY DISSIPATION; OXIDATIVE STRESS; PHOTOINHIBITION.	
Thesagro: 	ARROZ; FITOMEJORAMIENTO; INIA TACUARI; TOLERANCIA A FRIO.	
Categoría del tema: 	F30 Genética vegetal y fitomejoramiento	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (12830-1) - PXI - AP - DD - PP/PLANT SCIENCE/2011 -  -  - DIS
TT - (100026-1) - PXI - AP - DD - PP/Blanco/Arb/2011/1 -  -  - DIS