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Nosema Species (nosema + species)
Selected AbstractsImmune suppression in the honey bee (Apis mellifera) following infection by Nosema ceranae (Microsporidia)ENVIRONMENTAL MICROBIOLOGY, Issue 9 2009Karina Antúnez Summary Two microsporidia species have been shown to infect Apis mellifera, Nosema apis and Nosema ceranae. This work present evidence that N. ceranae infection significantly suppresses the honey bee immune response, although this effect was not observed following infection with N. apis. Immune suppression would also increase susceptibility to other bee pathogens and senescence. Despite the importance of both Nosema species in honey bee health, there is no information about their effect on the bees' immune system and present results can explain the different virulence between both microsporida infecting honeybees. [source] Phylogenetic Analysis of Complete rRNA Gene Sequence of Nosema philosamiae Isolated from the Lepidopteran Philosamia cynthia riciniTHE JOURNAL OF EUKARYOTIC MICROBIOLOGY, Issue 3 2010FENG ZHU ABSTRACT. The microsporidian Nosema philosamiae is a pathogen that infects the eri-silkworm Philosamia cynthia ricini. The complete sequence of rRNA gene (4,314 bp) was obtained by polymerase chain reaction amplification with specific primers and sequencing. The sequence analysis showed that the organization of the rRNA of N. philosamiae was similar to the pattern of Nosema bombycis. Phylogenetic analysis of rRNA gene sequences revealed that N. philosamiae had a close relationship with other Nosema species, confirming that N. philosamiae is correctly assigned to the genus Nosema. [source] Phylogenetic Analysis of Nosema antheraeae (Microsporidia) Isolated from Chinese Oak Silkworm, Antheraea pernyiTHE JOURNAL OF EUKARYOTIC MICROBIOLOGY, Issue 4 2006LIN-LING WANG ABSTRACT. The microsporidian Nosema antheraeae is a pathogen that infects the Chinese oak silkworm, Antheraea pernyi. We sequenced the complete small subunit (SSU) rRNA gene and the internal transcribed spacer (ITS) of N. antheraeae, and compared the SSU rRNA sequences in other microsporidia. The results indicated that Nosema species, including N. antheraeae, formed two distinct clades, consistent with previous observations. Furthermore, N. antheraeae is clustered with N. bombycis with high bootstrap support. The organization of the rRNA gene of N. antheraeae is LSU,ITS1,SSU,ITS2-5S, also following a pattern similar to the Nosema type species, N. bombycis. Thus, N. antheraeae is a Nosema species and has a close relationship to N. bombycis. [source] Transfer of Nosema locustae (Microsporidia) to Antonospora locustae n. comb.THE JOURNAL OF EUKARYOTIC MICROBIOLOGY, Issue 2 2004Based on Molecular, Ultrastructural Data ABSTRACT. Nosema locustae is a microsporidian parasite of grasshopper pesthd that is used as a biological control agent, and is one of the emerging model systems for microsporidia. Due largely to its diplokaryotic nuclei, N. locustae has been classified in the genus Nosema, a large genus with members that infect a wide variety of insects. However, some molecular studies have cast doubt on the validity of certain Nosema species, and on the taxonomic position of N. locustae. To clarify the affinities of this important insect parasite we sequenced part of the rRNA operon of N. locustae and conducted a phylogenetic analysis using the complete small subunit rRNA gene. Nosema locustae is only distantly related to the nominotypic N. bombycis, and is instead closely related to Antonospora scoticae, a recently described parasite of bees. We examined the ultrastructure of mature N. locustae spores, and found the spore wall to differ from true Nosema species in having a multi-layered exospore resembling that of Antonospora (one of the distinguishing features of that genus). Based on both molecular and morphological evidence, therefore, we propose transferring N. locustae to the genus Antonospora, as Antonospora locustae n. comb. [source] | ||||||||||