期刊
FUNGAL BIOLOGY
卷 120, 期 3, 页码 324-337出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2015.11.003
关键词
Amoeboid swarmer; Biofuel; Golgi apparatus; Life cycle; Synaptonemal complex; Zoospore
类别
资金
- National Science Foundation [MRI DEB-0500766, DEB-1455611]
- Division Of Environmental Biology
- Direct For Biological Sciences [1455611] Funding Source: National Science Foundation
Successful algal cultivation for biofuel production is one path in the transition to a renewable energy economy. The green alga Scenedesmus dimorphus is a candidate for biofuel production, but is subject to parasitism and subsequent population crash when cultivated in open ponds. From an open pond cultivating S. dimorphus for biofuel production in New Mexico, USA, an amoeboid parasite was isolated, designated as isolate FD61, and its rDNA operon sequenced. A BLAST search for nuc 18S rDNA (18S) sequence similarity identified the parasite as Paraphysoderma sedebokerense (Blastocladiomycota). Here, we examine the ultrastructure of P. sedebokerense and compare it with that of a sister taxon, Physoderma maydis. The parasite has thin-walled vegetative sporangia and thick-walled resting sporangia. Our observations indicate that amoeboid swarmers are produced in the vegetative phase, while either amoeboid swarmers or zoospores are the product of meiosis in resting sporangia. Meiosis is confirmed by the presence of synaptonemal complexes in resting sporangia nuclei. Notably, P. sedebokerense has a Golgi apparatus with stacked cistemae, a feature reported for P. maydis, but which is absent in all other examined taxa in Blastocladiomycota. This report furthers our knowledge of the life cycle of P. sedebokerense. (C) 2015 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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