Aluminum stress differentially affects physiological performance and metabolic compounds in cultivars of highbush blueberry

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dc.contributor.authorCárcamo Fincheira, Paz
dc.contributor.authorReyes Diaz, Marjorie
dc.contributor.authorRengel, Zed
dc.contributor.authorAlberdi, Miren
dc.contributor.authorOmena Garcia, Rebeca Patricia
dc.contributor.authorNunes Nesi, Adriano
dc.contributor.authorInostroza Blancheteau, Claudio
dc.date2019
dc.date.accessioned2021-04-30T16:59:14Z
dc.date.available2021-04-30T16:59:14Z
dc.description.abstractAluminum (Al) toxicity is one of the major factors that limit the growth and production of crops in acid soils. Highbush blueberry (Vaccinium corymbosum L.) cultivars differing in resistance to Al toxicity regarding root growth and photosynthetic performance were used. In this study, we compared the physiological and metabolic strategies to cope with Al toxicity among the highbush blueberry cultivars [two new ones (Camellia and Cargo) and three established ones (Brigitta (Al-resistant), Star and Duke)]. Aluminum concentration in roots and leaves increased in all cultivars after 24 and 48 h of exposure to Al, but less so in roots of cultivar Camellia and leaves of cultivar Cargo. These two cultivars displayed minor effects of Al exposure in terms of photosynthetic activity in comparison with the established cultivars. Furthermore, Cargo did not vary fluorescence parameters, whereas Camellia exhibited a decrease in effective quantum yield (Phi PSII) and electron transport rate (ETR) and a change in non-photochemical quenching (NPQ) and maximum quantum yield (Fv/Fm) under Al after 48 h. The Al treatment increased total phenols in leaves of Brigitta, Cargo, and Camellia, whereas antioxidant activity increased in Star and Cargo after 48 h. Aluminum exposure decreased malate concentration in roots of all cultivars, but no change was noted in fumarate concentration. The antioxidant activity correlated with photosynthetic performance and the total phenol concentration in the leaves of new cultivars exposed to Al, suggesting enhanced resistance in the short-term experiment. The principal component analysis separated the new from the established cultivars. In conclusion, the new cultivars appear to be more Al-resistant than the established ones, with Star being most Al-sensitive. Regarding the Al-resistance mechanisms of the new cultivars, it is suggested that Camellia could have a root Al-exclusion mechanism under Al toxicity. This mechanism could be explained by low Al concentration in roots, suggesting that this cultivar could exude organic acid, allowing to chelate Al in the rhizosphere. Nonetheless, further researches are needed to confirm this assumption.
dc.identifier.citationSCIENTIFIC REPORTS,Vol.9,,2019
dc.identifier.doi10.1038/s41598-019-47569-8
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/3764
dc.language.isoen
dc.publisherNATURE PUBLISHING GROUP
dc.sourceSCIENTIFIC REPORTS
dc.titleAluminum stress differentially affects physiological performance and metabolic compounds in cultivars of highbush blueberry
dc.typeArticle
uct.catalogadorWOS
uct.indizacionSCI
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