Photosynthetica 2023, 61(2):168-176 | DOI: 10.32615/ps.2022.044

Light intensity affects tolerance of pyrene in Chlorella vulgaris and Scenedesmus acutus

R.S. TOMAR1, R. ATRE1, D. SHARMA1, P. RAI-KALAL1, A. JAJOO1, 2
1 School of Life Science, Devi Ahilya University, 452017 Indore, India
2 School of Biotechnology, Devi Ahilya University, 452017 Indore, India

The impact of light intensity on the toxicity of pyrene, a 4-ring polycyclic aromatic hydrocarbon (PAH), was studied in Chlorella vulgaris and Scenedesmus acutus. Both species were cultured under low light, LL [50-60 µmol(photon) m-2 s-1], and high light, HL [100-110 µmol(photon) m-2 s-1] conditions to study the effects of pyrene (PYR) toxicity on growth parameters, the content of biomolecules, chlorophyll content, and photosynthetic efficiency. In the presence of PYR, S. acutus could grow well in LL and HL intensity. On the other hand, C. vulgaris showed a drastic decrease in growth and photosynthesis during HL conditions due to PYR toxicity. Regulation of nonphotochemical and photochemical quenching was responsible for the survival of S. acutus under PYR toxicity in LL and HL conditions. Thus, S. acutus seems to be a more promising candidate for pyrene degradation under varying light conditions.

Additional key words: Chlorella vulgaris; light intensity; photosynthesis; pyrene; Scenedesmus acutus.

Received: July 8, 2022; Revised: August 28, 2022; Accepted: September 13, 2022; Prepublished online: October 17, 2022; Published: June 6, 2023  Show citation

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TOMAR, R.S., ATRE, R., SHARMA, D., RAI-KALAL, P., & JAJOO, A. (2023). Light intensity affects tolerance of pyrene in Chlorella vulgaris and Scenedesmus acutus. Photosynthetica, 61(SPECIAL ISSUE 2023/1), 168-176. doi: 10.32615/ps.2022.044
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