Pyropia yezoensis can utilize CO2 in the air during moderate dehydration

• Published in: Chinese journal of oceanology and limnology 2014-03, Vol.32 (2), p.358-364
• Main Author: 周伟 何林文 杨芳 林阿朋 张宝玉 牛建峰 王广策
• Format: Article
• Language: English
• Subjects: air; Algae; Biology; Carbon dioxide; Carbon dioxide concentration; Dehydration; Earth and Environmental Science; Earth Sciences; macroalgae; Moisture content; Oceanography; Photosynthesis; Photosystem I; Photosystem II; protein content; Pyropia yezoensis; Rehydration; Ribulose-bisphosphate carboxylase; Rubisco活性; Seaweeds; Thalli; thallus; Tidal waves; tides; Water content; 二氧化碳浓度; 光系统II; 循环电子传递; 条斑紫菜; 水利用; 环境空气; 菌体形态
• ISSN: 0254-4059; 2096-5508; 1993-5005; 2523-3521
• DOI: 10.1007/s00343-014-3093-7

Pyropia yezoensis, an intertidal seaweed, experiences regular dehydration and rehydration with the tides. In this study, the responses of P. yezoensis to dehydration and rehydration under high and low CO2 concentrations （（600-700）×10^-6 and （40-80）×10^-6, named Group I and Group II respectively） were investigated. The thalli of Group I had a significantly higher effective photosystem II quantum yield than the thalli of Group II at 71% absolute water content （AWC）. There was little difference between thalli morphology, total Rubisco activity and total protein content at 100% and 71% AWC, which might be the basis for the normal performance of photosynthesis during moderate dehydration. A higher effective photosystem I quantum yield was observed in the thalli subjected to a low CO2 concentration during moderate dehydration, which might be caused by the enhancement of cyclic electron flow. These results suggested that P. yezoensis can directly utilize COz in ambient air during moderate dehydration.