Phylogenetic analysis of Sesuvioideae (Aizoaceae) inferred from nrDNA internal transcribed spacer (ITS) sequences and morphological data |
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Authors: | N S Hassan J Thiede S Liede-Schumann |
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Institution: | (1) Botany Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt;(2) Botanical Institute & Garden, Hamburg University, Hamburg, Germany;(3) Department of Plant Systematics, University of Bayreuth, 95440 Bayreuth, Germany;(4) Biozentrum Klein Flottbek, Systemetik der pflanzen, Hamburg University, Ohnhorststrasse 18, 22609 Hamburg, Germany |
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Abstract: | The phylogeny of the four genera of Aizoaceae subfamily Sesuvioideae (Sesuvium, Cypselea, Trianthema and Zaleya) is elucidated employing internal transcribed spacer (ITS) sequences and 23 morphological characters. Phylogenetic analysis
based on ITS sequences and a combined molecular-morphological analysis provide largely congruent results. The monophyly of
Sesuvioideae and its close relationship to Aizooideae s.l. and Mesembryanthemoideae is confirmed. Zaleya is placed within Trianthema and Cypselea within Sesuvium by ITS analysis, but in the combined analysis, Zaleya forms an unresolved polytomy with the two Trianthema clades and Cypselea, as well as two Sesuvium species, remain unresolved. Sesuvium sesuvioides and S. hydaspicum, previously treated as synonyms, are closely related, but molecular data do not support conspecifity. The Trianthema triquetra complex needs further intensive study because the African T. triquetra sample is closer to the NE African-Arabian T. sheilae than to Australian samples of T. triquetra. The close relationship of four species of Trianthema (T. patellitecta, T. rhynchocalyptra, T. megasperma, and T. pilosa) from Australia based on molecular data is supported morphologically by the exclusive possession of a well-developed indumentum
in these taxa. |
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Keywords: | Aizoaceae Cypselea Evolution ITS Morphology Parsimony Sesuvioideae Sesuvium Trianthema Zaleya |
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