UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian <i>Olea europaea</i> (L.) Varieties Differently
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 arg...
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MDPI AG
2020-12-01
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| Series: | Plants |
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| Online Access: | https://www.mdpi.com/2223-7747/9/12/1712 |
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| author | Chiara Piccini Giampiero Cai Maria Celeste Dias Marco Romi Roberta Longo Claudio Cantini |
| author_facet | Chiara Piccini Giampiero Cai Maria Celeste Dias Marco Romi Roberta Longo Claudio Cantini |
| author_sort | Chiara Piccini |
| collection | DOAJ |
| description | 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 <i>F<sub>v</sub></i>/<i>F<sub>m</sub></i>) and has a higher requirement for sugars (e.g., glucose) possible to counteract stress and to restore energy. |
| first_indexed | 2024-03-10T14:18:16Z |
| format | Article |
| id | doaj.art-393a8afaf3eb42e4a64fd3b13a453c23 |
| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-10T14:18:16Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-393a8afaf3eb42e4a64fd3b13a453c232023-11-20T23:34:32ZengMDPI AGPlants2223-77472020-12-01912171210.3390/plants9121712UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian <i>Olea europaea</i> (L.) Varieties DifferentlyChiara Piccini0Giampiero Cai1Maria Celeste Dias2Marco Romi3Roberta Longo4Claudio Cantini5Department of Life Sciences, University of Siena, via Mattioli 4, 53100 Siena, ItalyDepartment of Life Sciences, University of Siena, via Mattioli 4, 53100 Siena, ItalyDepartment of Life Sciences, Centre for Functional Ecology, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, PortugalDepartment of Life Sciences, University of Siena, via Mattioli 4, 53100 Siena, ItalyDepartment of Life Sciences, University of Siena, via Mattioli 4, 53100 Siena, ItalyInstitute for BioEconomy, National Research Council of Italy, 58022 Follonica, ItalyGiven 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 <i>F<sub>v</sub></i>/<i>F<sub>m</sub></i>) and has a higher requirement for sugars (e.g., glucose) possible to counteract stress and to restore energy.https://www.mdpi.com/2223-7747/9/12/1712UV-B radiation<i>Olea europae</i>photosynthesispigmentssugarsantioxidant capacity |
| spellingShingle | Chiara Piccini Giampiero Cai Maria Celeste Dias Marco Romi Roberta Longo Claudio Cantini UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian <i>Olea europaea</i> (L.) Varieties Differently Plants UV-B radiation <i>Olea europae</i> photosynthesis pigments sugars antioxidant capacity |
| title | UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian <i>Olea europaea</i> (L.) Varieties Differently |
| title_full | UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian <i>Olea europaea</i> (L.) Varieties Differently |
| title_fullStr | UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian <i>Olea europaea</i> (L.) Varieties Differently |
| title_full_unstemmed | UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian <i>Olea europaea</i> (L.) Varieties Differently |
| title_short | UV-B Radiation Affects Photosynthesis-Related Processes of Two Italian <i>Olea europaea</i> (L.) Varieties Differently |
| title_sort | uv b radiation affects photosynthesis related processes of two italian i olea europaea i l varieties differently |
| topic | UV-B radiation <i>Olea europae</i> photosynthesis pigments sugars antioxidant capacity |
| url | https://www.mdpi.com/2223-7747/9/12/1712 |
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