Gastony, Gerald , Nakazato, Takuya , Yatskievych, George .
Systematics and phylogeny of the recently rediscovered Anogramma ascensionis (Pteridaceae) using data from AFLPs, rbcL sequences, and morphology.
The molecular phylogenetic study of Anogramma species and related genera by Nakazato and Gastony (2003) found Anogramma in the traditional sense of R. Tryon (1962) to be polyphyletic, and suggested that the A. chaerophylla group might be either congeneric with Pityrogramma or a genus sister to it. That study included all species of Anogramma sensu Tryon except A. ascensionis, known only from Ascension Island in the South Atlantic half way between Brazil and Africa. Morphological study by Tryon and Tryon (1982) had placed A. ascensionis closest to A. chaerophylla from tropical America, but at the time of the 2003 study A. ascensionis was suspected to be extinct because it had not been recorded from Ascension Island since 1958 despite searches for it in 1976, 1986, and 1995. In 2011, A. ascensionis was rediscovered on Ascension Island, and we obtained its DNA to determine its phylogenetic position relative to the taxa included in the 2003 study. Based on analyses of rbcL, A.ascensionis nests in a clade with A. chaerophylla. In fact, its rbcL sequence is identical to that of some A. chaerophylla accessions. Amplified Fragment Length Polymorphisms (AFLPs) of total genomic DNA from A. chaerophylla, A. novogaliciana, and A. ascensionis were generated and analyzed to yield an unrooted Neighbor-joining (NJ) phenogram. This NJ phenogram places A. novogaliciana closest to Mexican A. chaerophylla and shows that A. ascensionis nests within a group of A. chaerophylla accessions from Brazil.Morphological characters used by Hooker (1854) and Tryon and Tryon (1982) to separate A. ascensionis from A. chaerophylla are being re-examined.
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1 - Indiana University, Department Of Biology, Jordan Hall, 1001 East Third Street, BLOOMINGTON, IN, 47405-7005, USA
2 - University Of Memphis, Department Of Biology, 3774 Walker Avenue, Memphis, TN, 38152, USA
3 - Missouri Botanical Garden, PO Box 299, St. Louis, MO, 63166-0299, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Union E/Hyatt
Date: Monday, July 9th, 2012
Time: 10:30 AM