Photosynthetic Physiological Response of Porphyra yezoensis to Light Change at Different CO 2 Concentrations

• Published in: Water
• Main Authors: Cheng Chen, Yanyan Zhang, Zhenjie Feng, Miaomiao Wu, Tianpeng Xu, Sen Qiao, Wen Wang, Jing Ma, Juntian Xu
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2023
• Subjects: ocean acidification; light change; Porphyra yezoensis; photosynthetic physiology; Hydraulic engineering; TC1-978; Water supply for domestic and industrial purposes; TD201-500; Ocean acidification
• Online Access: https://doi.org/10.3390/w15040781; https://doaj.org/article/733f3e4f6e33422a8f36136e30dfcd98

The effect of different CO 2 concentrations and their subsequent light changes on the photosynthetic characteristics of Porphyra yezoensis are not well understood. The relationship between the availability of CO 2 and light to physiological traits of the thalli could help understand the response and adaptation mechanisms of P. yezoensis to extreme weather changes. In this study, the photosynthetic response of P. yezoensis to light changes at different CO 2 concentrations was determined. Under low light intensity, the high CO 2 concentration promoted the relative growth rate (RGR) of P. yezoensis by 22.79% compared to that of ambient CO 2 treatment. The net photosynthetic rate and phycoerythrin (PE) content under high CO 2 were also significantly greater than those under ambient CO 2 treatment at low light therapy. Under high light intensity, high CO 2 exacerbated the inhibitory effect of light on the RGR of thalli. The net photosynthetic rate and PE content were significantly reduced by 12.53% and 14.06% at elevated CO 2 concentration under a high light intensity, respectively. Furthermore, the net photosynthetic rate was significantly decreased when the light intensity was rapidly reduced, especially under simultaneously elevated CO 2 concentrations. These findings indicate that elevated CO 2 concentration increased the RGR and PE content at low light intensity of P. yezoensis . In addition, this study provides a theoretical basis for the response and adaptation mechanism of P. yezoensis to extreme weather changes.