RRC ID 34728
著者 Jin P, Gao K, Villafañe VE, Campbell DA, Helbling EW.
タイトル Ocean acidification alters the photosynthetic responses of a coccolithophorid to fluctuating ultraviolet and visible radiation.
ジャーナル Plant Physiol
Abstract Mixing of seawater subjects phytoplankton to fluctuations in photosynthetically active radiation (400-700 nm) and ultraviolet radiation (UVR; 280-400 nm). These irradiance fluctuations are now superimposed upon ocean acidification and thinning of the upper mixing layer through stratification, which alters mixing regimes. Therefore, we examined the photosynthetic carbon fixation and photochemical performance of a coccolithophore, Gephyrocapsa oceanica, grown under high, future (1,000 μatm) and low, current (390 μatm) CO₂ levels, under regimes of fluctuating irradiances with or without UVR. Under both CO₂ levels, fluctuating irradiances, as compared with constant irradiance, led to lower nonphotochemical quenching and less UVR-induced inhibition of carbon fixation and photosystem II electron transport. The cells grown under high CO₂ showed a lower photosynthetic carbon fixation rate but lower nonphotochemical quenching and less ultraviolet B (280-315 nm)-induced inhibition. Ultraviolet A (315-400 nm) led to less enhancement of the photosynthetic carbon fixation in the high-CO₂-grown cells under fluctuating irradiance. Our data suggest that ocean acidification and fast mixing or fluctuation of solar radiation will act synergistically to lower carbon fixation by G. oceanica, although ocean acidification may decrease ultraviolet B-related photochemical inhibition.
巻・号 162(4)
ページ 2084-94
公開日 2013-8-1
DOI 10.1104/pp.113.219543
PII pp.113.219543
PMID 23749851
PMC PMC3729784
MeSH Absorption Carbon / metabolism Carbon Dioxide Chlorophyll / metabolism Chlorophyll A Haptophyta / physiology* Light Photosynthesis / radiation effects* Photosystem II Protein Complex / metabolism Phytoplankton / physiology Seawater / chemistry Ultraviolet Rays
IF 6.902
引用数 26
WOS 分野 PLANT SCIENCES
リソース情報
藻類 NIES-1318