期刊
PROTIST
卷 169, 期 1, 页码 122-140出版社
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.protis.2017.11.002
关键词
Parasites of algae; ultrastructure; molecular phylogeny; life cycle; amoeboid zoospore; kinetosome
类别
资金
- RSF [16-14-10302]
- ERC [322669]
- scholarship program Jean d'Alembert of Paris-Saclay University, French Agence Nationale de la Recherche [ANR-15-CE32-0003]
- ZIN RAS [AAAA-A17-117030310322-3]
- Russian Science Foundation [16-14-10302] Funding Source: Russian Science Foundation
- European Research Council (ERC) [322669] Funding Source: European Research Council (ERC)
Fungi encompass, in addition to classically well-studied lineages, an ever-expanding diversity of poorly known lineages including zoosporic chytrid-like parasites. Here, we formally describe Amoeboradix gromovi gen. et sp. nov. comprising a set of closely related strains of chytrid-like parasites of the yellow-green alga Tribonema gayanum unusually endowed with amoeboid zoospores. Morphological and ultrastructural features of A. gromovi observed by light and transmission electron microscopy recall previous descriptions of Rhizophydium anatropum. A. gromovi exhibits one of the longest kinetosomes known in eukaryotes, composed of microtubular singlets or doublets. To carry out molecular phylogenetic analysis and validate the identification of different life cycle stages, we amplified 18S rRNA genes from three A. gromovi strains infecting T. gayanum cultures, single sporangia and single zoospores. Molecular phylogenetic analyses of 18S+28S rRNA concatenated genes of the type strain revealed that A. gromovi is closely related to the recently described species Sanchytrium tribonematis, another parasite of Tribonema that had been tentatively classified within Monoblepharidomycetes. However, our phylogenetic analysis with an extended taxon sampling did not show any particular affinity of Amoeboradix and Sanchytrium with described fungal taxa. Therefore, Amoeboradix gromovi and Sanchytrium tribonematis likely represent a new divergent taxon that remains incertae sedis within Fungi.
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