Tortorelli Giada, Rosset Sabrina L, Sullivan Clarisse E S, Woo Sarah, Johnston Erika C, Walker Nia Symone, Hancock Joshua R, Caruso Carlo, Varela Alyssa C, Hughes Kira, Martin Christian, Quinn Robert A, Drury Crawford
Hawai'i Institute of Marine Biology, University of Hawai'i at Mānoa, Kāne'ohe, HI 96744, United States.
Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48823, United States.
ISME J. 2025 Jan 2;19(1). doi: 10.1093/ismejo/wraf073.
The susceptibility of corals to environmental stress is determined by complex interactions between host genetic variation and the Symbiodiniaceae family community. We exposed genotypes of Montipora capitata hosting primarily Cladocopium or Durusdinium symbionts to ambient conditions and an 8-day heat stress. Symbionts' cell surface glycan composition differed between genera and was significantly affected by temperature and oxidative stress. The metabolic profile of coral holobionts was primarily shaped by symbionts identity, but was also strongly responsive to oxidative stress. At peak temperature stress, betaine lipids in Cladocopium were remodeled to more closely resemble the abundance and saturation state of Durusdinium symbionts, which paralleled a larger metabolic shift in Cladocopium. Exploring how Symbiodiniaceae members regulate stress and host-symbiont affinity helps identify the traits contributing to coral resilience under climate change.
珊瑚对环境压力的敏感性取决于宿主基因变异与共生藻科群落之间的复杂相互作用。我们将主要寄宿着枝状双鞭甲藻或耐热双鞭甲藻共生体的头状蔷薇珊瑚基因型暴露于环境条件和为期8天的热应激之下。共生体的细胞表面聚糖组成在不同属之间存在差异，并且受到温度和氧化应激的显著影响。珊瑚共生体的代谢谱主要由共生体的身份决定，但对氧化应激也有强烈反应。在温度应激峰值时，枝状双鞭甲藻中的甜菜碱脂质被重塑，使其丰度和饱和度状态更接近耐热双鞭甲藻共生体，这与枝状双鞭甲藻中更大的代谢转变相平行。探索共生藻科成员如何调节应激以及宿主与共生体的亲和力，有助于确定在气候变化下有助于珊瑚恢复力的特征。
