Rising CO2 levels alter the responses of the red macroalga Pyropia yezoensis under light stress
Rising CO2 levels alter the responses of the red macroalga Pyropia yezoensis under light stress
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二氧化碳水平升高改变了红藻条斑紫藻在光胁迫下的反应
DOI：
10.1016/j.aquaculture.2018.11.011
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发表时间：
2019-02-25
期刊：
影响因子：
4.5
通讯作者：
Xu, Juntian
中科院分区：
文献类型：
--
作者：
Bao, Menglin;Wang, Jianhao;Xu, Juntian
由于大气CO2上升，海洋对CO2的吸收增加，导致海洋酸化（OA），并由于海水浊度增加和深度变化而改变光强度。已经发现大型藻类会改变它们的行为，以应对OA和其他气候因素。为了优化经济上重要的海藻养殖策略，本研究评估了条斑甲藻在三种不同的光照强度（HL：35%; ML：10%; LL：5%）和两种CO2浓度（环境CO2，400 ppm;升高CO2，1000 ppm）下的生长。结果表明，条斑紫菜的生长受到明显的抑制，这是由于光合作用，相对电子传递速率（rETR）和类胡萝卜素合成的减少。在低CO2浓度下，条斑紫菜PSI和PSII的相对生长速率（RGR）、最大净光合速率（P-max）和最大相对电子传递速率（rETR（max））均显著高于对照。条斑紫菜藻蓝蛋白（PC）和藻红蛋白（PE）含量在CO2浓度升高时同时增加。这项研究表明，藻类物种可能会适应未来的海洋酸化，避免光诱导的生长抑制。
Increased ocean uptake of CO2, due to rising atmospheric CO2 is leading to ocean acidification (OA) and alters light intensity due to increased turbidity and depth variation in seawater. Macroalgae have been found to alter their behavior in response to OA and other climate factors. In order to optimize farming strategies for economically important seaweeds, this study assesses the growth of Pyropia yezoensis at three different light intensities (HL:35%; ML:10%; LL:5%) and two CO2 concentrations (ambient CO2, 400 ppm; elevated CO2, 1000 ppm). Results show that P. yezoensis growth was significantly inhibited by decreased light intensity, due to reductions in photosynthesis, relative electron transfer rate (rETR) and carotenoid synthesis. However, under LL conditions, the relative growth rates (RGR), maximum net photosynthetic rate (P-max) and maximum relative electron transfer rate (rETR(max)) of PSI and PSII in P. yezoensis, were significantly enhanced under elevated CO2 concentrations. Phycocyanin (PC) and phycoerythrin (PE) levels in P. yezoensis were simultaneously increased under elevated CO2 concentrations. This study demonstrates that algal species may adapt to ocean acidification in the future and avoid light-induced growth inhibition.