Dual roles of reactive oxygen species in intertidal macroalgae Ulva prolifera under ultraviolet-B radiation

Zhao, Xinyu; Zheng, Wei; Qu, Tongfei; Zhong, Yi; Xu, Jinhui; Jiang, Yijun; Zhang, Huanxin; Tang, Xuexi; Wang, Ying

doi:10.1016/j.envexpbot.2021.104534

Cited by 9 publications

(18 citation statements)

References 43 publications

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“…Our previous study showed that excessive ROS were produced in U. prolifera exposed to high doses of UVBR and could cause irreversible damage [ 27 ]. Similarly, in the present study, we also observed that UVBR inhibited photosynthesis in U. prolifera , especially under high-dose and long-term exposure.…”

Section: Discussionmentioning

confidence: 99%

“…Photosynthesis is an important factor in the production of H 2 O 2 , which is related to the environmental adaptability in U. prolifera . H 2 O 2 plays an important role in the activation of the antioxidant system and secondary signal pathway under UVBR [ 27 ]. APX is located in chloroplasts that lack CAT, and it is an important part of the GSH-ASA cycle in algae.…”

Section: Discussionmentioning

confidence: 99%

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

Zhong

Zhao

et al. 2022

IJMS

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The Yellow Sea green tide (YSGT) is the world’s largest transregional macroalgal blooms, and the causative species Ulva prolifera (U. prolifera) suffers from ultraviolet-b radiation (UVBR) during the floating migration process. Previous study confirmed that U. prolifera 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−2 s−1), NL+0.3 (UVBR: 0.3 W·m−2), and NL+1.6 (UVBR: 1.6 W·m−2). 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 U. prolifera 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 U. prolifera under LDSTR, enabling the thalli to adapt to the light conditions during the long duration and distance involved in floating migration.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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

Zhong

Zhao

et al. 2022

IJMS

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“…NPQ plays important roles in acclimating to the environment under UVB radiation in macroalgae [ 15 – 17 ]. UVB radiation significantly increased NPQ, indicating that NPQ is an effective photoprotection strategy in green macroalgae U. prolifera [ 18 ], and similar results were also observed in red macroalgae Neoporphyra haitanensis [ 16 , 18 ]. Furthermore, the induction of NPQ in N. haitanensis was dependent on delta pH [ 16 ].…”

Section: Introductionmentioning

confidence: 63%

“…Previous studies have confirmed the significant roles of NPQ and the antioxidant system during defense against environmental stress in the common intertidal macroalgae U. prolifera . Furthermore, existing research has revealed a correlation between NPQ and antioxidant system during the stress response of U. prolifera [ 18 , 38 , 39 ]. Due to the crucial role of AOX in the plant stress response and the wide occurrence of UVB in the natural environment, it is necessary to explore the relationship between antioxidant systems, photoprotection, and ROS homeostasis in U. prolifera under UVB radiation.…”

Section: Introductionmentioning

confidence: 99%

Acclimation of intertidal macroalgae Ulva prolifera to UVB radiation: the important role of alternative oxidase

Xu,

Zhao,

Zhong

et al. 2024

BMC Plant Biol

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Background Solar radiation is primarily composed of ultraviolet radiation (UVR, 200 − 400 nm) and photosynthetically active radiation (PAR, 400 − 700 nm). Ultraviolet-B (UVB) radiation accounts for only a small proportion of sunlight, and it is the primary cause of plant photodamage. The use of chlorofluorocarbons (CFCs) as refrigerants caused serious ozone depletion in the 1980s, and this had led to an increase in UVB. Although CFC emissions have significantly decreased in recent years, UVB radiation still remains at a high intensity. UVB radiation increase is an important factor that influences plant physiological processes. Ulva prolifera, a type of macroalga found in the intertidal zone, is intermittently exposed to UVB. Alternative oxidase (AOX) plays an important role in plants under stresses. This research examines the changes in AOX activity and the relationships among AOX, photosynthesis, and reactive oxygen species (ROS) homeostasis in U. prolifera under changes in UVB and photosynthetically active radiation (PAR). Results UVB was the main component of solar radiation impacting the typical intertidal green macroalgae U. prolifera. AOX was found to be important during the process of photosynthesis optimization of U. prolifera due to a synergistic effect with non-photochemical quenching (NPQ) under UVB radiation. AOX and glycolate oxidase (GO) worked together to achieve NADPH homeostasis to achieve photosynthesis optimization under changes in PAR + UVB. The synergism of AOX with superoxide dismutase (SOD) and catalase (CAT) was important during the process of ROS homeostasis under PAR + UVB. Conclusions AOX plays an important role in the process of photosynthesis optimization and ROS homeostasis in U. prolifera under UVB radiation. This study provides further insights into the response of intertidal macroalgae to solar light changes.

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“…Studies on algae have shown similar mechanisms, as expected by their phylogenetical relation to plants. For example, UV-B radiation-induced ROS production in peroxisomes and chloroplasts in Ulva prolifera provokes irreversible damage under 5 W m −2 [42]. In Chlamydomonas reinhardtii, UV-C radiation stress increased ROS levels and production of antioxidant polyphenols, a phenolic including caffeic acid, cinnamic acid, coumaric acid, salicylic acid, and protocatechuic acid, among others [43].…”

Section: Oxidative Stress By Uv Light Inductionmentioning

confidence: 99%

Ultraviolet Radiation and Its Effects on Plants

Correa¹,

Saavedra²,

Parra³

et al. 2023

Abiotic Stress in Plants - Adaptations to Climate Change

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Ultraviolet radiation is a portion of the electromagnetic spectrum ranging from 10 to 400 nm, classified into three main categories: UV-A (320–400 nm), UV-B (280–320 nm), and UV-C (100–280 nm). The UV radiation from the sun that crosses the atmosphere and reaches the earth’s surface is composed largely of UV-A radiation (95%) and, to a lesser extent, UV-B (5%), which is normally filtered by stratospheric ozone. With the thinning of the ozone layer, UV-B radiation penetrates deeper into the earth’s surface, where it becomes dangerous due to its high energy content that acts at the molecular level, affecting the cycles of carbon, nitrogen, and other elements, thus, having a direct impact on global warming. On the other hand, UV radiation alters numerous essential organic compounds for living organisms. Since its discovery, it has been established that e UV-B causes alterations in plant development and metabolism, both primary and secondary. In this chapter, we summarize the current knowledge about the effects of UV radiation on the morphological, biochemical, and genetic processes in plants.

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Dual roles of reactive oxygen species in intertidal macroalgae Ulva prolifera under ultraviolet-B radiation

Cited by 9 publications

References 43 publications

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

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

Acclimation of intertidal macroalgae Ulva prolifera to UVB radiation: the important role of alternative oxidase

Ultraviolet Radiation and Its Effects on Plants

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