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Open AccessArticle

UV-B Physiological Changes Under Conditions of Distress and Eustress in Sweet Basil

1
Institute of Life Sciences, Scuola Superiore Sant’Anna, Pz. Martiri della Libertà 33, 56127 Pisa, Italy
2
Department of Agriculture, Food and Environment, Via del Borghetto 80, 56124 Pisa, Italy
3
Department of Agricultural and Environmental Sciences, Università degli Studi di Milano, I-20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Plants 2019, 8(10), 396; https://doi.org/10.3390/plants8100396
Received: 11 September 2019 / Revised: 23 September 2019 / Accepted: 3 October 2019 / Published: 4 October 2019
UV-B radiation has been previously reported to induce protective or deleterious effects on plants depending on the UV-B irradiation doses. To elucidate how these contrasting events are physiologically coordinated, we exposed sweet basil plants to two UV-B doses: low (8.5 kJ m-2 day-1, 30 min exposure) and high (68 kJ m-2 day-1, 4 h exposure), with the plants given both doses once continuously in a single day. Physiological tests during and after both UV-B exposures were performed by comparing the stress-induced damage and adverse effects on photosynthetic activity, the concentration and composition of photosynthetic and non-photosynthetic pigments, and stress-related hormones biosynthesis in basil plants. Our results showed that upon receiving a high UV-B dose, a severe inactivation of oxygen evolving complex (OEC) activity at the PSII donor side and irreversible PSII photodamage caused primarily by limitation of the acceptor side occurred, which overloaded protective mechanisms and finally led to the death of the plants. In contrast, low UV-B levels did not induce any signs of UV-B stress injuries. The OEC partial limitation and the inactivation of the electron transport chain allowed the activation of photoprotective mechanisms, avoiding irreversible damage to PSII. Overall results indicate the importance of a specific response mechanisms regulating photoprotection vs irreversible photoinhibition in basil that were modulated depending on the UV-B doses.
Keywords: irradiation; photodamage; photosynthetic pigments; plant hormones irradiation; photodamage; photosynthetic pigments; plant hormones
MDPI and ACS Style

Mosadegh, H.; Trivellini, A.; Lucchesini, M.; Ferrante, A.; Maggini, R.; Vernieri, P.; Sodi, A.M. UV-B Physiological Changes Under Conditions of Distress and Eustress in Sweet Basil. Plants 2019, 8, 396.

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