, Volume 32, Issue 2, pp 358-364
Date: 06 Mar 2014

Pyropia yezoensis can utilize CO2 in the air during moderate dehydration

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Abstract

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 CO2 in ambient air during moderate dehydration.

Supported by the Science and Technology Strategic Pilot Program of Chinese Academy of Sciences (No. XDA11020404), the National High Technology Research and Development Program of China (863 Program) (No. 2012AA100806), the Tianjin Natural Science Foundation (No. 12JCZDJC22200), and the Project for Developing Marine Economy by Science and Technology in Tianjin (No. KX2010-0005)
ZHOU Wei, HE Linwen, and YANG Fang contributed equally to this work.