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The photokinetics of thermo-tolerance in Symbiodinium

机译：共生素中耐热性的光动力学

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摘要

There is currently much debate about the ecological advantages for reef corals of hosting multiple types of the symbiotic dinoflagellate Symbiodinium. Amongst these is their apparent capacity to tolerate higher than normal water temperatures. There is strong photokinetic evidence that the trait of heat-tolerance in plants is accompanied by energetic tradeoffs but little such evidence yet exists for corals. We use rapid light curves (RLCs) to investigate the photokinetic basis for thermo-tolerance in the reef coral Acropora millepora with sym-bionts of contrasting thermal tolerance for which there are measured differences in energetics. Our results show that under non-stressful temperatures, corals with heat-tolerant type D Symbiodinium had a 41% lower maximum relative electron transport rate (rETRmax) and lower light absorption efficiency (α) due to lower cell Chl a content compared with corals with heat-sensitive type C2 symbionts. Our results provide support for a photokinetic link between heat tolerance and deficits in holobiont (coral + symbiont) growth, lipid stores and reproduction. Reduced electron transport rate and light absorption capacity may be genotype-specific attributes that enable clade D symbionts and their cnidarian hosts to cope with temperature stress but they inherently influence the photosynthetic function of the symbionts and thus have negative downstream effects on the coral.
机译：目前，关于承载多种共生双鞭毛共生鞭毛藻共生生物的珊瑚礁在生态上的优势存在很多争议。其中之一是它们的表观承受能力高于正常水温。有很强的光动力学证据表明植物的耐热性伴随着能量的折衷，但是对于珊瑚来说，这种证据还很少。我们使用快速光曲线（RLCs）来研究珊瑚礁Acropora millepora中耐热性的光动力学基础，该方法具有对比的耐热性共生体，其热力学上存在可测量的差异。我们的结果表明，在非胁迫温度下，耐热D型共生菌的珊瑚的最大相对电子传输速率（rETRmax）和光吸收效率（α）降低了41％，这是由于其细胞中Chla含量较低的缘故。 C2型热敏共生体。我们的结果为耐热性和全环叶类（珊瑚+共生体）生长，脂质存储和繁殖缺陷之间的光动力学联系提供了支持。降低的电子传输速率和光吸收能力可能是基因型特定的属性，可使进化枝D共生体及其刺胞宿主应对温度胁迫，但它们固有地影响共生体的光合功能，因此对珊瑚产生负面的下游影响。

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