Rising CO2 interacts with growth light and growth rate to alter photosystem II photoinactivation of the coastal diatom Thalassiosira pseudonana.

Rising CO2 interacts with growth light and growth rate to alter photosystem II photoinactivation of the coastal diatom Thalassiosira pseudonana.
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上升的二氧化碳与生长光和生长速率相互作用,改变沿海硅藻假微型海藻的光系统 II 光失活

DOI:
10.1371/journal.pone.0055562
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Campbell DA
Campbell DA
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li G;Campbell DA

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我们研究了pCO2和生长光对沿海海洋硅藻海链藻CCMP 1335在环境和预期的本世纪末pCO2(750 ppmv)下生长的相互作用,以及30至380 µmol光子·m−2·s−1的生长光范围。pCO2升高显着刺激T.在亚饱和生长光下,而不是在饱和至超饱和生长光下。在环境pCO2下,光系统II对光失活的敏感性(σi)随生长速率的增加而增加,但在高pCO2下生长的细胞生长速率与σi之间不存在依赖性,因此在强光下,高pCO2下生长的细胞对光系统II的光失活的敏感性较低,从而降低了维持光系统II功能的运行成本。生长光改变了RbcL(RUBISCO)和PsaC(PSI)蛋白亚基的含量,以及亚基之间的比例,但在环境和升高的pCO2下生长的细胞之间对这些和其他蛋白池的影响有限。
We studied the interactive effects of pCO2 and growth light on the coastal marine diatom Thalassiosira pseudonana CCMP 1335 growing under ambient and expected end-of-the-century pCO2 (750 ppmv), and a range of growth light from 30 to 380 µmol photons·m−2·s−1. Elevated pCO2 significantly stimulated the growth of T. pseudonana under sub-saturating growth light, but not under saturating to super-saturating growth light. Under ambient pCO2 susceptibility to photoinactivation of photosystem II (σi) increased with increasing growth rate, but cells growing under elevated pCO2 showed no dependence between growth rate and σi, so under high growth light cells under elevated pCO2 were less susceptible to photoinactivation of photosystem II, and thus incurred a lower running cost to maintain photosystem II function. Growth light altered the contents of RbcL (RUBISCO) and PsaC (PSI) protein subunits, and the ratios among the subunits, but there were only limited effects on these and other protein pools between cells grown under ambient and elevated pCO2.
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