Balancing Damage via Non-Photochemical Quenching, Phenolic Compounds and Photorespiration in <i>Ulva prolifera</i> Induced by Low-Dose and Short-Term UV-B Radiation

Balancing Damage via Non-Photochemical Quenching, Phenolic Compounds and Photorespiration in <i>Ulva prolifera</i> Induced by Low-Dose and Short-Term UV-B Radiation

The Yellow Sea green tide (YSGT) is the world’s largest transregional macroalgal blooms, and the causative species <i>Ulva prolifera</i> (<i>U. prolifera</i>) suffers from ultraviolet-b radiation (UVBR) during the floating migration process. Previous study confirmed that <...

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Bibliographic Details
Main Authors: Yi Zhong, Jinhui Xu, Xinyu Zhao, Tongfei Qu, Chen Guan, Chengzong Hou, Xuexi Tang, Ying Wang
Format: Article
Language:English
Published: MDPI AG 2022-02-01
Series:International Journal of Molecular Sciences
Subjects:
non-photochemical quenching
phenolic compounds
photorespiration
balancing damage
ultraviolet-b radiation
<i>Ulva prolifera</i>
Online Access:https://www.mdpi.com/1422-0067/23/5/2693
Description
Summary:The Yellow Sea green tide (YSGT) is the world’s largest transregional macroalgal blooms, and the causative species <i>Ulva prolifera</i> (<i>U. prolifera</i>) suffers from ultraviolet-b radiation (UVBR) during the floating migration process. Previous study confirmed that <i>U. prolifera</i> displayed a wide variety of physiological responses characterized as acclimation to UVBR, while the response mechanisms against low-dose and short-term radiation (LDSTR) are not clear. A study with photosynthetically active radiation (PAR) and UVBR was designed: normal light (NL: 72 μmol photons m<sup>−2</sup> s<sup>−1</sup>), NL+0.3 (UVBR: 0.3 W·m<sup>−2</sup>), and NL+1.6 (UVBR: 1.6 W·m<sup>−2</sup>). The results showed that high-dose UVBR inhibited photosynthesis in thalli, especially under long-term exposure, while a variety of physiological responses were observed under LDSTR. The inhibition of photosynthesis appeared to be ameliorated by the algae under LDSTR. Further analysis showed that <i>U. prolifera</i> achieved balancing damage by means of non-photochemical quenching (NPQ), accumulation of phenolic compounds coupled with the ASA-GSH cycle involved in the antioxidant process and enhanced photorespiratory metabolism under LDSTR. This study provides new insights into the balancing damage mechanisms of <i>U. prolifera</i> under LDSTR, enabling the thalli to adapt to the light conditions during the long duration and distance involved in floating migration.
ISSN:1661-6596
1422-0067

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