Scanning electron microscopy observation of host entry by two brown algae endophytic in Laminaria saccharina (Laminariales, Phaeophyceae)

Heesch, Svenja and Peters, Akira F. (1999) Scanning electron microscopy observation of host entry by two brown algae endophytic in Laminaria saccharina (Laminariales, Phaeophyceae) Phycological Research, 47 (1). pp. 1-5. DOI 10.1046/j.1440-1835.1999.00145.x.

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Abstract

The germination of spores of the endophytic brown algae Laminariocolax aecidioides and Laminarionema elsbetiae (Ectocarpales sensu lato) on their host Laminaria saccharina was studied using scanning electron microscopy. Zoids were the infective units in both taxa. Despite a large difference in size between spores of the species studied, the initial steps of infection were similar. Zoids settled on the host surface, and during secretion of adhesive material from their anterior end, the spores became elongated to rod-shaped and stood erect on the host. A single germ tube developed at the proximal end and penetrated the intact surface of the host. Sharp edges around the entrance hole and the absence of inward deformation of the host surface around the settled zoids suggest an enzymatic rather than a mechanical penetration mechanism.

Document Type: Article
Keywords: disease; endophyte; germination; infection; kelp; Laminaria saccharina; Laminariocolax aecidioides; Laminarionema elsbetiae; spore; ultrastructure; zoid
Research affiliation: OceanRep > Institute for Marine Science Kiel
Refereed: Yes
DOI etc.: 10.1046/j.1440-1835.1999.00145.x
ISSN: 1322-0829
Date Deposited: 18 Feb 2008 17:24
Last Modified: 03 Jan 2017 12:19
URI: http://eprints.uni-kiel.de/id/eprint/4079

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