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Title: UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian Olea europaea (L.) Varieties Differently
Authors: Piccini, Chiara
Cai, Giampiero
Dias, Maria Celeste 
Romi, Marco
Longo, Roberta
Cantini, Claudio
Keywords: UV-B radiation; Olea europae; photosynthesis; pigments; sugars; antioxidant capacity
Issue Date: 4-Dec-2020
Publisher: MDPI
Project: SFRH/BPD/100865/2014 
Tuscany Region - Ph.D. grant of C.P. in the framework of ‘Pegaso’-POR FSE TOSCANA 2014-2020 Program GiovaniSì 
Serial title, monograph or event: Plants
Volume: 9
Issue: 12
Abstract: Given the economical importance of the olive tree it is essential to study its responses to stress agents such as excessive UV-B radiation, to understand the defense mechanisms and to identify the varieties that are able to cope with it. In the light of the analysis carried out in this study, we argue that UV-B radiation represents a dangerous source of stress for the olive tree, especially in the current increasingly changing environmental conditions. Both the varieties considered (Giarraffa and Olivastra Seggianese), although resistant to the strong treatment to which they were exposed, showed, albeit in different ways and at different times, evident effects. The two varieties have different response times and the Giarraffa variety seems better suited to prolonged UV-B stress, possible due to a more efficient and quick activation of the antioxidant response (e.g., flavonoids use to counteract reactive oxygen species) and because of its capacity to maintain the photosynthetic efficiency as well as a relatively higher content of mannitol. Moreover, pigments reduction after a long period of UV-B exposure can also be an adaptation mechanism triggered by Giarraffa to reduce energy absorption under UV-B stress. Olivastra Seggianese seems less suited to overcome UV-B stress for a long period (e.g., higher reduction of Fv/Fm) and has a higher requirement for sugars (e.g., glucose) possible to counteract stress and to restore energy.
ISSN: 2223-7747
DOI: 10.3390/plants9121712
Rights: openAccess
Appears in Collections:I&D CFE - Artigos em Revistas Internacionais

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