02400naa a2200349 a 450000100080000000500110000800800410001902200140006002400400007410000210011424501160013526000090025130000180026049000080027850001510028652013190043765000100175665000210176665000170178765000220180465300240182665300130185065300230186365300210188665300200190770000160192770000130194370000200195670000170197670000140199377300430200710128302019-11-04       2011    bl uuuu     u00u1 u    #d  a0168-94527 a10.1016/j.plantsci.2011.01.0232DOI1 aBONNECARRERE, V.  aResponse to photoxidative stress induced by cold in japonica rice is genotype dependent.h[electronic resource]  c2011  ap.726-732 180  v180  aArticle history: received 25 November 2010; received in revised form 27 January 2011; accepted 31 January 2011; available online 15 February 2011.  aABSTRACT.  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).  aARROZ  aFITOMEJORAMIENTO  aINIA TACUARI  aTOLERANCIA A FRIO  aANTIOXIDANT ENZYMES  aCHILLING  aENERGY DISSIPATION  aOXIDATIVE STRESS  aPHOTOINHIBITION1 aBORSANI, O.1 aDIAZ, P.1 aCAPDEVIELLE, F.1 aBLANCO, P.H.1 aMONZA, J.  tPlant Science, 2011, 180 (5): 726-732.