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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Carbonic anhydrase activity changes in response to increased temperature and pCO(2) in Symbiodinium-zoanthid associations
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Carbonic anhydrase activity changes in response to increased temperature and pCO(2) in Symbiodinium-zoanthid associations

机译：碳酸酐酶活性变化以响应温度升高和Symbiodinium-zoanthid协会中的pCO（2）

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摘要

Carbon dioxide (CO2) makes up less than 1% of dissolved inorganic carbon (DIC) in the ocean. To acquire carbon dioxide for photosynthesis, many marine autotrophs rely on the enzyme carbonic anhydrase (CA) to catalyze the conversion of bicarbonate ions, (HCO3-) to CO2. In zoanthids and other cnidarians with Symbiodinium spp. endosymbionts, CA is essential for transporting CO2 to symbionts for photosynthesis. Temperature and ambient DIC affect CA activity, therefore, increased sea water temperatures and ocean acidification (OA) will alter CO2 transport in symbiotic cnidarians. However, these effects are likely to be species specific for both host and symbiont, as different cnidarians and Symbiodinium spp. vary in their mechanisms of DIC transport and utilization of CA. In this study, host and symbiont CA activity in the zoanthids Palythoa sp. and Zoanthus sp. varied with thermal stress and low pH. Increased temperature inhibited algal, but not host CA activity in Zoanthus sp. polyps with A4 Symbiodinium, while temperature had no effect on CA activity in Palythoa sp. with Cl Symbiodinium. High pCO(2)/low pH altered algal CA activity in both zoanthid species, but host CA activity changed in Zoanthus sp. polyps only. This study shows that thermal stress and OA induce species-specific changes in CA activity, and thus DIC transport in symbiotic zoanthids. These observations suggest that CA activity in symbiotic cnidarians will be altered by climate conditions predicted for the future, and for some cnidarians, changes in CA activity may inhibit photosynthesis. (C) 2015 Elsevier B.V. All rights reserved.
机译：二氧化碳（CO2）构成海洋中溶解的无机碳（DIC）的不到1％。为了获得用于光合作用的二氧化碳，许多海洋自养生物都依靠碳酸酐酶（CA）催化碳酸氢根离子（HCO3-）转化为CO2。在共栖动物和其他刺胞动物中有Symbiodinium spp。内共生体，CA对于将CO2输送到共生体进行光合作用至关重要。温度和环境DIC影响CA活性，因此，海水温度升高和海洋酸化（OA）将改变共生刺胞中的CO2传输。但是，这些效应可能是宿主和共生菌特有的物种，因为不同的刺胞动物和共生菌属。 DIC传输和利用CA的机制各不相同。在这项研究中，寄主和共生CA的活动在zoanthids Palythoa sp。和Zoanthus sp。随热应力和低pH值而变化。温度升高抑制了Zoanthus sp。中的藻类，但没有宿主CA活性。息肉与A4共生素，而温度对Palythoa sp中的CA活性没有影响。与Cl Symbiodinium。高pCO（2）/低pH值改变了两个拟南芥物种中的藻类CA活性，但宿主CA活性在Zoanthus sp。中发生了变化。仅息肉。这项研究表明，热应激和OA诱导了CA活性的物种特异性变化，从而在共生的拟南芥中传播DIC。这些观察结果表明，共生cnidarians中的CA活性将因未来的气候条件而改变，对于某些cnidarians，CA活性的变化可能会抑制光合作用。 （C）2015 Elsevier B.V.保留所有权利。

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