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A new concept for Dictyostelium sphaerocephalum based on morphology and phylogenetic analysis of nuclear ribosomal internal transcribed spacer region sequences

AuthorsRomeralo Rodríguez, María ; Fiz Palacios, Omar ; Lado, Carlos ; Cavender, J. C.
Keywordscellular slime moulds
nuclear ribosomal ITS
Issue Date2007
CitationCanadian Journal of Botany 85(1): 104-110 (2007)
AbstractThree dictyostelid isolates were found in Spain and Argentina that are morphologically different from known species. These isolates have some features similar to Dictyostelium sphaerocephalum (Oudem.) Sacc., Marchal & E´ .J. Marchal, but differ in size and sorocarp branching pattern. We sequenced the nuclear ribosomal internal transcribed spacer region to explore phylogenetic relationships among this group of species, including the three new isolates and their closest relatives. In all phylogenetic analyses performed, sequences of all three isolates group together with sequences from ‘‘typical’’ D. sphaerocephalum samples. This result supports previous observations of the morphological plasticity in dictyostelids, especially D. sphaerocephalum, leading us to broaden the classical concept of this species.
Les auteurs ont re´colte´ trois isolats de dictyoste´lides, en Espagne et en Argentine, lesquels diffe`rent morphologiquement des espe`ces connues. Ces isolats ressemblent pour certains caracte`res au Dictyostelium sphaerocephalum (Oudem.) Sacc., Marchal & E´ .J. Marchal, mais en diffe`rent par la dimension et le patron de ramification des sorocarpes. Afin d’explorer les relations phyloge´ne´tiques parmi ce groupe d’espe`ces, les auteurs ont se´quence´ la re´gion de l’ITS ribosomique nucle´ique, incluant les trois nouveaux isolats et leurs plus proches parents. Ce resultat toutes les analyses phyloge ´ne´tiques re´alise´es, les trois isolats montrent des se´quences ‘typiques’ d’e´chantillons du D. sphaerocephalum. Cette re´sulte supporte les observations ante´ce´dentes sur la plasticite´ des dictyoste´lides, surtout du D. sphaerocephalum, et conduit les auteurs a` e´largir le concept classique de cette espe`ce.
Publisher version (URL)10.1139/B06-147
ISSN1480-3305 (Online)
Appears in Collections:(RJB) Artículos
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