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Delineation of Two Sibling Red Algal Species, Gracilaria Gracilis and Gracilaria Dura (Gracilariales, Rhodophyta), Using Multiple DNA Markers: Resurrection of the Species G. Dura Previously Described in the Northern Atlantic 200 Years Ago 1
Author(s) -
Destombe Christophe,
Valero Myriam,
Guillemin Marie Laure
Publication year - 2010
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2010.00846.x
Subject(s) - biology , gracilaria , botany , plastid , interspecific competition , taxon , zoology , algae , evolutionary biology , genetics , gene , chloroplast
Molecular markers belonging to the three different genomes, mitochondrial ( cox 2‐ cox 3 spacer), plastid ( rbc L), and nuclear (internal transcribed spacer [ITS] 2 region), were used to compare samples of the two morphologically related species Gracilaria gracilis (Stackh.) Steentoft, L. M. Irvine et Farnham and G. dura (C. Agardh) J. Agardh collected along Atlantic coasts. In northern Europe, the distinction between these two species is ambiguous, and they are currently recognized under the single name of G. gracilis . The low but congruent patterns of genetic divergence observed for markers of the three genomic compartments highly suggest that these two taxa correspond effectively to two different genetic entities as previously described 200 years ago, based on morphological traits. However, thanks to the combination of different DNA markers, occurrence of “incongruent” cytotypes (i.e., mitotypes of G. dura associated with chlorotypes of G. gracilis ) in individuals collected from Brittany, suggests interspecific hybridization between the two sibling species studied.