Manganese toxicity and UV-B radiation differentially influence the physiology and biochemistry of highbush blueberry (Vaccinium corymbosum) cultivars

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dc.contributor.authorRojas Lillo, Yesenia
dc.contributor.authorAlberdi, Miren
dc.contributor.authorAcevedo, Patricio
dc.contributor.authorInostroza Blancheteau, Claudio
dc.contributor.authorRengel, Zed
dc.contributor.authorde la Luz Mora, Maria
dc.contributor.authorReyes Diaz, Marjorie
dc.date2014
dc.date.accessioned2021-04-30T16:59:13Z
dc.date.available2021-04-30T16:59:13Z
dc.description.abstractManganese (Mn2+) toxicity or UV-B radiation and their individual effects on plants have been documented previously. However, no study about the combined effect of these stresses is available. We evaluated the individual and combined effects of excess Mn2+ and UV-B radiation on physiological and biochemical parameters in two highbush blueberry (Vaccinium corymbosum L.) cultivars differing in resistance to Mn toxicity (Brigitta (resistant) and Bluegold (sensitive)). Plants grown in Hoagland nutrient solution were subjected to the following treatments: 2 mMMnCl(2) (control), 500 mMMnCl(2) (toxicMn(2+)), UV-Bradiation (a daily dose of 94.4 kJm(-2)), and the combined treatment (toxicMn(2+) + UV-B) for 30 days. In both cultivars, theMn(2+) + UV-B treatment caused a more negative effect on net photosynthesis (Pn), stomatal conductance (gs), the photochemical parameters of PSII and the chl a/b ratio than the treatments with toxic Mn2+ or UV-B alone. However, Brigitta showed also a better acclimation response in Pn and gs than Bluegold at the end of the experiment. The Mn2+ + UV-B treatment inhibited growth, enhanced radical scavenging activity and superoxide dismutase activity, and increased the concentration of total UV-absorbing compounds, phenols and anthocyanins, mainly in Bluegold. In conclusion, Mn-resistant Brigitta showed a better acclimation response and greater resistance to the combined stress of Mn2+ toxicity and UV-B exposure than the Mn-sensitive Bluegold. An increased concentration of photoprotective compounds and enhanced resistance to oxidative stress in Brigitta could underpin increased resistance to the combined stress.
dc.identifier.citationFUNCTIONAL PLANT BIOLOGY,Vol.41,156-167,2014
dc.identifier.doi10.1071/FP12393
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/3732
dc.language.isoen
dc.publisherCSIRO PUBLISHING
dc.sourceFUNCTIONAL PLANT BIOLOGY
dc.subject.englishantioxidants
dc.subject.englishphenols
dc.subject.englishphotosynthesis
dc.subject.englishphotochemical efficiency of PSII
dc.subject.englishphotosynthetic pigments
dc.subject.englishstomatal conductance
dc.titleManganese toxicity and UV-B radiation differentially influence the physiology and biochemistry of highbush blueberry (Vaccinium corymbosum) cultivars
dc.typeArticle
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