Fisiologia Vegetal
URI permanente para esta coleçãohttps://locus.ufv.br/handle/123456789/185
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Item An integrated multi-layered analysis on Desmonostoc(Universidade Federal de Viçosa, 2019-07-31) Almeida, Allan Victor Martins; Araújo, Wagner Luiz; http://lattes.cnpq.br/5605331353460376Cyanobacteria (phylum Cyanobacteria) are gram-negative bacteria, capable of performing oxygenic photosynthesis. These microorganisms form a phylogenetically coherent group despite presenting a great morphological diversity. Although the taxonomic classification of cyanobacteria was for a long time based primarily on morphological characters the application of other techniques, especially in the last decades, contributed to a better resolution of the cyanobacteria systematics, leading to a revision of the phylum. Accordingly, polyphasic approaches applied to the study of strains described as belonging to the genus Nostoc have indicated a polyphyletic origin of this genus, when considered its description based solely on morphological criteria. Thus, the taxonomy and systematics of strains closely related to the genus Nostoc have been reviewed leading to the description of new genera. Although the genus Desmonostoc occurs as one new genera, relatively few studies have been carried out to elucidate the phylogenetic and morphological relationships among its species, as well as between members of this genus and those closely related. In fact, only one study performed the characterization of a Desmonostoc strain, culminating with the description of the species D. salinum whereas another described the possible biotechnological application of members of this genus. In this context, the present study investigated the diversity within the genus Desmonostoc, based on morphological, molecular, metabolic and physiological characters. Although the last character is a non-usual tool used in the polyphasic approach it was efficient in the characterization of the genus Desmonostoc performed here. Our phylogenetic analysis for the 16S rRNA gene put all strains used here in the D1 cluster of Desmonostoc and demonstrate the possible emergence of two novel sub-clusters. It was also possible to observe that the nitrogenase genes, nifD and nifH, exhibits different evolutionary histories within the Desmonostoc strains. Collectively metabolic and physiological data, coupled with the morphometric ones are, in general, in good agreement with the separation based on the 16S phylogeny. Furthermore, it provide important information on the diversity of Desmonostoc lineages collected from different brazilian biomes by revealing that they are cosmopolitan strains, acclimatized to low luminous intensities, with great metabolic diversity within the same genus and with biotechnological potential.