Short-term UV-B radiation affects photosynthetic performance and antioxidant gene expression in highbush blueberry leaves

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dc.contributor.authorInostroza Blancheteau, Claudio
dc.contributor.authorAcevedo, Patricio
dc.contributor.authorLoyola, Rodrigo
dc.contributor.authorArce Johnson, Patricio
dc.contributor.authorAlberdi, Miren
dc.contributor.authorReyes Diaz, Marjorie
dc.date2016
dc.date.accessioned2021-04-30T17:04:12Z
dc.date.available2021-04-30T17:04:12Z
dc.description.abstractThe impact of increased artificial UV-B radiation on photosynthetic performance, antioxidant and SOD activities and molecular antioxidant metabolism responses in leaves of two highbush blueberry (Vaccinium corymbosum L. cv. Brigitta and Bluegold) genotypes was studied. Plants were grown in a solid substrate and exposed to 0, 0.07, 0.12 and 0.19 W m(-2) of biologically-effective UV-B irradiance for 0 -72 h. Our findings show that net photosynthesis (Pn) decreased significantly in Bluegold, accompanied by a reduction in the effective quantum yield (phi PSII) and electron transport rate (ETR), especially at the highest UV-B irradiation. On the other hand, Brigitta showed a better photosynthetic performance, as well as a clear increment in the antioxidant activity response that could be associated with increased superoxide dismutase activity (SOD) in the early hours of induced UV-B stress in all treatments. At the molecular level, the expression of the three antioxidant genes evaluated in both genotypes had a similar tendency. However, ascorbate peroxidase (APX) expression was significantly increased (6-fold) in Bluegold compared to Brigitta. Thus, the reduction of Pn concomitant with a lower photochemical performance and a reduced response of antioxidant metabolism suggest that the Bluegold genotype is more sensitive to UV-B radiation, while Brigitta appears to tolerate better moderate UV-B irradiance in a short-term experiment. (C) 2016 Elsevier Masson SAS. All rights reserved.
dc.identifier.citationPLANT PHYSIOLOGY AND BIOCHEMISTRY,Vol.107,301-309,2016
dc.identifier.doi10.1016/j.plaphy.2016.06.019
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/3882
dc.language.isoen
dc.publisherELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
dc.sourcePLANT PHYSIOLOGY AND BIOCHEMISTRY
dc.subject.englishUV-B radiation
dc.subject.englishHighbush blueberry
dc.subject.englishPhotochemical parameters
dc.subject.englishRadical scavenging activity
dc.subject.englishAntioxidant gene expression
dc.titleShort-term UV-B radiation affects photosynthetic performance and antioxidant gene expression in highbush blueberry leaves
dc.typeArticle
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uct.indizacionSCI
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