Evolutionary reversals in Bossiella (Corallinales, Rhodophyta): first report of a coralline genus with both geniculate and nongeniculate species

Autor:	Paul W. Gabrielson, Cassandra Jensen, Patrick T. Martone, Katharine R. Hind
Rok vydání:	2018
Předmět:	0106 biological sciences 0301 basic medicine Species complex Subfamily Phylogenetic tree Bossiella biology 010604 marine biology & hydrobiology Coralline algae Sequence Analysis DNA Plant Science Aquatic Science biology.organism_classification Biological Evolution 01 natural sciences 03 medical and health sciences DNA Algal 030104 developmental biology Genus Evolutionary biology Rhodophyta Geniculate 14. Life underwater Crustose Phylogeny
Zdroj:	Journal of Phycology. 54:788-798
ISSN:	0022-3646
DOI:	10.1111/jpy.12788
Popis:	This is the first report of a coralline genus with both geniculate (upright fronds with non-calcified joints) and nongeniculate species that has been verified by DNA sequence data. Two nongeniculate (crustose) species of Bossiella are recognized, B. mayae sp. nov. and B. exarticulata sp. nov. DNA sequencing of the lectotype specimen of Pseudolithophyllum whidbeyense revealed that this name had been misapplied and instead belongs to an undescribed coralline species in the Hapalidiales. Phylogenetic analyses of concatenated DNA sequences (psbA, rbcL, COI-5P) indicate that B. mayae and B. exarticulata represent phenotypic reversals from the geniculate character state back to the nongeniculate character state. Secondary loss of genicula has occurred three times in the subfamily Corallinoideae, once to generate the entirely nongeniculate genus Crusticorallina and twice in the now morphologically heterotypic Bossiella. Since phenotypic reversals have occurred several times during the evolution of coralline algae, we speculate about the putative mechanism and adaptive significance of this phenomenon.
Databáze:	OpenAIRE
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