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A comparative study of phenoloxidase activity in diseased and bleached colonies of the coral Acropora millepora

Lookup NU author(s): Professor John Bythell

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Abstract

In scleractinian (hard) corals, immune responses involving phenoloxidase (PO) activity are known to play a role in coral wound healing, but there have been no studies investigating their roles in mitigating either disease or bleaching in an Indo-Pacific coral. PO activity induces the release of reactive oxygen species leading to a cytotoxic cellular environment, which enhances resistance against pathogens, but the compound is also likely to induce oxidative stress during bleaching. Antioxidants such as melanin, whose synthesis is activated by PO activity, and peroxidase are potentially important for mitigating the effects of oxidative stress. Therefore, PO activity was investigated in healthy and diseased colonies of Acropora millepora. PO activity levels were compared among tissues bordering white syndrome lesions and at two locations (mid and outer) at increasing distances from lesions. Equivalent locations were sampled for PO activity on visibly healthy colonies. Additionally, PO and peroxidase activity was compared between severely bleached and healthy colonies of A. millepora. Overall, PO activity of diseased colonies was significantly lower than that of healthy colonies, but with relatively higher activity at the WS lesion border. Severely bleached colonies had significantly lower PO activity than healthy colonies, and peroxidase was also lower, but not significant. Lower PO activity in unhealthy colonies supports earlier suggestions that lower immune activity leads to increased susceptibility to disease and bleaching. Additionally, low enzyme activity levels may indicate a depletion of colony resources. Increased PO activity at lesion borders in diseased colonies confirms the relative up-regulation of a key coral immune defense in response to WS in A. millepora.


Publication metadata

Author(s): Palmer CV, Bythell JC, Willis BL

Publication type: Article

Journal: Developmental & Comparative Immunology

Year: 2011

Volume: 35

Issue: 10

Pages: 1098-1101

Print publication date: 19/04/2011

ISSN (print): 0145-305X

ISSN (electronic): 1879-0089

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.dci.2011.04.001

DOI: 10.1016/j.dci.2011.04.001


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