Comparative Study of Algal Responses and Adaptation Capability to Ultraviolet Radiation with Different Nutrient Regimes

Lingxiao Ren, Jing Huang, Keqiang Ding, Yi Wang, Yangyang Yang, Lijuan Zhang and Haoyu Wu
Additional contact information
Lingxiao Ren: School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Jing Huang: Three Gorges Beijing Enterprises Nanjing Water Group Co., Ltd., Nanjing 210000, China
Keqiang Ding: School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Yi Wang: School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Yangyang Yang: School of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China
Lijuan Zhang: School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Haoyu Wu: School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China

IJERPH, 2022, vol. 19, issue 9, 1-22

Abstract: Frequent outbreaks of harmful algal blooms (HABs) represent one of the most serious outcomes of eutrophication, and light radiation plays a critical role in the succession of species. Therefore, a better understanding of the impact of light radiation is essential for mitigating HABs. In this study, Chlorella pyrenoidosa and non-toxic and toxic Microcystis aeruginosa were mono-cultured and co-cultured to explore algal responses under different nutrient regimes. Comparisons were made according to photosynthetically active radiation (PAR), UV-B radiation exerted oxidative stresses, and negative effects on the photosynthesis and growth of three species under normal growth conditions, and algal adaptive responses included extracellular polymeric substance (EPS) production, the regulation of superoxide dismutase (SOD) activity, photosynthetic pigments synthesis, etc. Three species had strain-specific responses to UV-B radiation and toxic M. aeruginosa was more tolerant and showed a higher adaptation capability to UV-B in the mono-cultures, including the lower sensitivity and better self-repair efficiency. In addition to stable μ max in PAR ad UV-B treatments, higher EPS production and enhanced production of photosynthetic pigments under UV-B radiation, toxic M. aeruginosa showed a better recovery of its photosynthetic efficiency. Nutrient enrichment alleviated the negative effects of UV-B radiation on three species, and the growth of toxic M. aeruginosa was comparable between PAR and UV-B treatment. In the co-cultures with nutrient enrichment, M. aeruginosa gradually outcompeted C. pyrenoidosa in the PAR treatment and UV-B treatment enhanced the growth advantages of M. aeruginosa , when toxic M. aeruginosa showed a greater competitiveness. Overall, our study indicated the adaptation of typical algal species to ambient UV-B radiation and the stronger competitive ability of toxic M. aeruginosa in the UV-radiated waters with severer eutrophication.

Keywords: Microcystis aeruginosa; Chlorella pyrenoidosa; ultraviolet B radiation; photosynthetic efficiency; adaptation capability; nutrient enrichment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/19/9/5485/pdf (application/pdf)
https://www.mdpi.com/1660-4601/19/9/5485/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:19:y:2022:i:9:p:5485-:d:806810

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().