Phongsathorn Röser, Karin Glaser, Desiree Juchem, John Everett Parkinson, Christian R. Voolstra, Ulf Karsten
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Under control conditions, the species displayed predominantly low-to-moderate light requirements for photosynthesis with increased photoinhibition at higher photon flux rates. After 30 days of heat acclimation at 32 °C, maximum photosynthetic activity declined in <i>Effrenium voratum</i>, doubled in <i>Fugacium kawagutii,</i> and remained unchanged in <i>Breviolum psygmophilum</i>. In subsequent acute heating assays, species-specific effects on maximum photosynthetic activity were observed. Photosynthesis in all species declined across a temperature gradient between 25 and 39 °C in the acute heating assays; full inhibition occurred at 37 °C in <i>B. psygmophilum</i> and <i>E. voratum</i> and at 39 °C in <i>B. aenigmaticum</i> and <i>F. kawagutii</i>. In contrast, respiration remained largely constant in all species across temperatures. 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引用次数: 0
摘要
珊瑚礁暴露在各种环境压力下,导致白化现象,内共生微藻(共生微藻科)因此与珊瑚宿主脱离。白化的珊瑚会受到损害并面临死亡。强光照射和海水温度升高往往会导致珊瑚白化。珊瑚组织中共生藻的生理特性有助于提高全生物体(宿主及其所有共生体)的耐热性。本研究旨在调查光照和温度胁迫对三个属的四种共生藻光合产氧和耗氧的影响。在对照条件下,这些物种的光合作用主要需要低到中等的光照,在光通量率较高时,光抑制作用增强。在 32 ℃ 的高温下适应 30 天后,伏牛花(Effrenium voratum)的最大光合作用活性下降,川口藤(Fugacium kawagutii)的最大光合作用活性加倍,而紫云英(Breviolum psygmophilum)的最大光合作用活性保持不变。在随后的急性加热试验中,观察到了物种对最大光合作用活性的特异性影响。在急性加热试验中,所有物种的光合作用在 25 至 39 °C 的温度梯度范围内均有所下降;在 37 °C 时,B. psygmophilum 和 E. voratum 的光合作用受到完全抑制,而在 39 °C 时,B. aenigmaticum 和 F. kawagutii 的光合作用受到完全抑制。相比之下,所有物种的呼吸作用在不同温度下基本保持不变。我们的数据表明,物种特有的光生理学特征导致了伞形科植物不同的耐热性。
Species-specific effects of light and temperature on photosynthesis and respiration among Symbiodiniaceae (Dinophyceae)
Coral reefs are exposed to various environmental stressors that cause bleaching events, whereby endosymbiotic microalgae (Symbiodiniaceae) disassociate from coral hosts. Bleached corals are compromised and face mortality. The combination of high-light exposure and elevated seawater temperature often lead to coral bleaching. The physiological properties of the Symbiodiniaceae within the coral tissues contribute to the thermal tolerance of the holobiont (the host and all its symbionts). The present study aimed to investigate the effects of light and temperature stress on four Symbiodiniaceae species from three genera with respect to photosynthetic oxygen production and consumption. Under control conditions, the species displayed predominantly low-to-moderate light requirements for photosynthesis with increased photoinhibition at higher photon flux rates. After 30 days of heat acclimation at 32 °C, maximum photosynthetic activity declined in Effrenium voratum, doubled in Fugacium kawagutii, and remained unchanged in Breviolum psygmophilum. In subsequent acute heating assays, species-specific effects on maximum photosynthetic activity were observed. Photosynthesis in all species declined across a temperature gradient between 25 and 39 °C in the acute heating assays; full inhibition occurred at 37 °C in B. psygmophilum and E. voratum and at 39 °C in B. aenigmaticum and F. kawagutii. In contrast, respiration remained largely constant in all species across temperatures. Our data point to species-specific photophysiological traits that lead to different thermal tolerances among Symbiodiniaceae.
期刊介绍:
Coral Reefs, the Journal of the International Coral Reef Society, presents multidisciplinary literature across the broad fields of reef studies, publishing analytical and theoretical papers on both modern and ancient reefs. These encourage the search for theories about reef structure and dynamics, and the use of experimentation, modeling, quantification and the applied sciences.
Coverage includes such subject areas as population dynamics; community ecology of reef organisms; energy and nutrient flows; biogeochemical cycles; physiology of calcification; reef responses to natural and anthropogenic influences; stress markers in reef organisms; behavioural ecology; sedimentology; diagenesis; reef structure and morphology; evolutionary ecology of the reef biota; palaeoceanography of coral reefs and coral islands; reef management and its underlying disciplines; molecular biology and genetics of coral; aetiology of disease in reef-related organisms; reef responses to global change, and more.