生物
系统发育树
内转录区
属
克莱德
GenBank公司
植物
系统发育学
16S核糖体RNA
分类单元
分类学(生物学)
网状的
动物
进化生物学
基因
遗传学
作者
Mariéllen Dornelles Martins,Nathali Machado de Lima,Luis Henrique Zanini Branco
摘要
A new Phormidium ‐like genus was found during an investigation of Oscillatoriales diversity in Brazil. Eight aerophytic populations from south and southeastern regions were isolated in monospecific cultures and submitted to polyphasic evaluation. The populations presented homogeneous morphology with straight trichomes, not attenuated, and apical cell with thickened cell wall. Phylogenetic analyses based on 16S rRNA gene sequences showed that these populations, plus the Brazilian strain Phomidium sp. B‐Tom from GenBank, formed a highly supported and distinctive clade, which corresponds to the new genus Pycnacronema , comprising six new species: P. brasiliensis (type species), P. arboriculum , P. conicum , P. marmoreum , P. rubrum, and P. savannensis . These results were confirmed and supported by rpo C1 and rbc L genes evaluated independently and by the concatenated analysis of 16S rRNA, rpo C1 and rbc L genes (for all species but P. savannensis ). Secondary structures of the D1‐D1′, box‐B, and V3 regions of the internal transcribed spacer were informative at specific level, being conserved in P. brasiliensis and variable among the other strains, also confirming the phylogenetic analyses. The generic name and specific epithets of the new taxa are proposed under the provisions of the International Code of Nomenclature of algae, fungi, and plants.
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