Abstract Detail

Systematics Section/ASPT

Pino, Ivonne Sanchez-del [1].

A new subgeneric classification for Alternanthera Forssk. (Gomphrenoideae, Amaranthaceae) based on molecular and morphological data.

Alternanthera comprises around 80-100 species basically from the Neotropics. Some other species distributes in Africa, Asia, and Australia. Although many species are invasive weeds, some of them are economically important as ornamentals or folk medicine in Mexico and Brazil. A recent molecular study using nuclear ITS and chloroplast trnL-F and rpl16 data suggested that the resulting gene tree is the frame of a possible scenario for a new classification below genus within the monophyletic Alternanthera. In order to test this hypothesis, a bigger sampling than those performed on previous studies was carried out, including observations from field-work, and a herbarium revision of specimens from different herbaria (NY, MO, P, IEB, S, MEXU, GE). Parsimony analysis was conducted using morphological characters and new molecular data from chloroplast (trnL-F, rpl16, and matk-trnk) and nuclear (ITS) DNA. Preliminary results suggest that at least two subgenera can be recognized within Alternanthera based on floral morphology characters such as inflorescences form, stigma and pistil shape, pseudostaminodia margin and presence or absence of pseudostaminodia, and geographic distribution.

Broader Impacts:

1 - Centro de Investigacion Cientifica de Yucatan, Banco de Germoplasma, Calle 43 No 130 Col. Chuburna de Hidalgo, Merida, Yucatan, 97200, Mexico

Keywords:
Amaranthaceae
Gomphrenoideae
Neotropics
Alternanthera.

Presentation Type: Oral Paper:Papers for Sections
Session: 4
Location: Magnolia/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 8:30 AM
Number: 4001
Abstract ID:463
Candidate for Awards:None