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<p>Cyanobacteria are the most promising models for CO<sub>2</sub> sequestration, production of chemicals, and renewal energy. Being photosynthetic organisms, they are continuously exposed to different intensities and wavelengths of light, including ultraviolet radiation (UVR). In the present investigation, we studied photosynthetically active radiation (PAR + UV−A + UV−B (PAB) effects on the cyanobacterium <i>Synechocystis</i> sp. PCC 6803 and its recovery under different wavelengths of light, such as PAR, blue light (BL), green light (GL), and red light (RL). The Chl <i>a</i> and total carotenoid content recovered maximally under BL and RL, whereas phycocyanin (PC) under BL. Maximum recovery in the photosynthetic performance was observed under GL and RL, whereas the least recovery was under BL. After 48&#xa0;h of PAB irradiation, minimum ROS was found under dark conditions. The maximum number of non-viable cells was found in 24&#xa0;h PAB, and in the recovery phase, it was found in BL and RL. Thus, it was evident that PAB negatively affects the growth, development, and overall fitness of <i>Synechocystis</i> sp. PCC 6803. The different wavelengths of light play a significant role in the recovery of the cyanobacterium <i>Synechocystis</i> sp. PCC 6803.</p>

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Blue and red light significantly aid in the recovery of damaged cells of the cyanobacterium Synechocystis sp. PCC 6803 exposed to ultraviolet radiation

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Prashant R. Singh,
  • Ashish P. Singh,
  • Amit Gupta,
  • Shailendra P. Singh,
  • Rajeshwar P. Sinha

摘要

Cyanobacteria are the most promising models for CO2 sequestration, production of chemicals, and renewal energy. Being photosynthetic organisms, they are continuously exposed to different intensities and wavelengths of light, including ultraviolet radiation (UVR). In the present investigation, we studied photosynthetically active radiation (PAR + UV−A + UV−B (PAB) effects on the cyanobacterium Synechocystis sp. PCC 6803 and its recovery under different wavelengths of light, such as PAR, blue light (BL), green light (GL), and red light (RL). The Chl a and total carotenoid content recovered maximally under BL and RL, whereas phycocyanin (PC) under BL. Maximum recovery in the photosynthetic performance was observed under GL and RL, whereas the least recovery was under BL. After 48 h of PAB irradiation, minimum ROS was found under dark conditions. The maximum number of non-viable cells was found in 24 h PAB, and in the recovery phase, it was found in BL and RL. Thus, it was evident that PAB negatively affects the growth, development, and overall fitness of Synechocystis sp. PCC 6803. The different wavelengths of light play a significant role in the recovery of the cyanobacterium Synechocystis sp. PCC 6803.