transparent gif


Ej inloggad.

Göteborgs universitets publikationer

The life cycle of Henneguya nuesslini Schuberg & Schroder, 1905 (Myxozoa) involves a triactinomyxon-type actinospore

Författare och institution:
D. M. Kallert (-); E. Eszterbauer (-); M. El-Matbouli (-); Christer Erséus (Zoologiska institutionen); W. Haas (-)
Publicerad i:
Journal of Fish Diseases, 28 ( 2 ) s. 71-79
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
The life cycle of the histozoic myxozoan parasite Henneguya nuesslini was investigated in two salmonid host species. Naive brown trout, Salmo trutta, and brook trout, Salvelinus fontinalis, were experimentally infected in two trials by triactinomyxon type actinospores from naturally infected Tubifex tubifex. In exposed common carp, Cyprinus carpio, no myxospore production was detected. The parasite formed cysts with mature myxospores in the connective tissue of the fish 102 days postexposure. The morphology of both actinosporean and myxosporean stages was described by light microscopy and a 1417-bp fragment of the 18S rDNA gene was sequenced. Sequence analysis confirmed the absolute congruence of the two developmental stages and assisted in determining species identity. Host range, tissue specificity and myxospore measurements provided sufficiently distinctive features to confirm species validity and were thus crucial for identification. The triactinomyxon spores had 16 secondary germ cells, unique dimensions, a very opaque sporoplasm matrix and three conspicuously protruding, pyriform polar capsules. This is the first record of a Henneguya sp. life cycle with a triactinomyxon-type actinospore, which suggests a close relationship with the Myxobolus group and a polyphyletic origin of the genus Henneguya.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper
henneguya, host specificity, life cycle, myxozoa, taxonomy, triactinomyxon, molecular characterization, myxobolus-cerebralis, species myxosporea, algonquian park, lake sasajewun, sp n., fish, sequences, light, stage
Postens nummer:
Posten skapad:
2007-06-18 09:25

Visa i Endnote-format

Göteborgs universitet • Tel. 031-786 0000
© Göteborgs universitet 2007