The algal symbiont modifies the transcriptome of the scleractinian coral euphyllia paradivisa during heat stress

Dalit Meron, Keren Maor-Landaw, Eviatar Weizman, Hiba Waldman Ben-Asher, Gal Eyal, Ehud Banin, Yossi Loya, Oren Levy

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The profound mutualistic symbiosis between corals and their endosymbiotic counterparts, Symbiodiniaceae algae, has been threatened by the increase in seawater temperatures, leading to breakdown of the symbiotic relationship—coral bleaching. To characterize the heat-stress response of the holobiont, we generated vital apo-symbiotic Euphyllia paradivisa corals that lacked the endosymbiotic algae. Using RNA sequencing, we analyzed the gene expression of these apo-symbionts vs. symbiotic ones, to test the effect of the algal presence on the tolerance of the coral. We utilized literature-derived lists of “symbiosis differentially expressed genes” and “coral heat-stress genes” in order to compare between the treatments. The symbiotic and apo-symbiotic samples were segregated into two separate groups with several different enriched gene ontologies. Our findings suggest that the presence of endosymbionts has a greater negative impact on the host than the environmental temperature conditions experienced by the holobiont. The peak of the stress reaction was identified as 28 C, with the highest number of differentially expressed genes. We suggest that the algal symbionts increase coral holobiont susceptibility to elevated temperatures. Currently, we can only speculate whether coral species, such as E. paradivisa, with the plasticity to also flourish as apo-symbionts, may have a greater chance to withstand the upcoming global climate change challenge.

    Original languageEnglish
    Article number256
    JournalMicroorganisms
    Volume7
    Issue number8
    DOIs
    StatePublished - Aug 2019

    Bibliographical note

    Publisher Copyright:
    © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

    Keywords

    • Algal symbiont
    • Apo-symbiont
    • Coral
    • Euphyllia paradivisa
    • Heat-stress
    • Holobiont

    ASJC Scopus subject areas

    • Microbiology (medical)
    • Virology
    • Microbiology

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