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Abstract Detail

Recent Topics Posters

Sanchez del Pino, Ivonne [1], Fuentes-Soriano, Sara [2].

The metareticulate pollen morphology of Alternanthera Forssk. (Gomphrenoideae, Amaranthaceae) and its phylogenetic and taxonomic implications .

Alternanthera (Amaranthaceae) are part of the Alternantheroid clade that is supported by molecular data and pollen morphology. The present study focuses on 13 representative species belonging to the two major clades and several subclades of Alternathera, and include the newly described A. costaricensis and A. echinocephala. Morphological comparisons of pollen are based on observations conducted under light microscopy (LM), scanning electron microscopy (SEM), and for the first time in any Amaranthaceae confocal laser scanning microscopy (CSLM). Pollen material was obtained from specimens deposited in major herbaria in Mexico and the United States, as well as personal collections stored at CICY. Analyses indicate that pollen grains in Alternanthera are pantoporate and nanoporate, dodecahedrical to spheroidal, and possess a poral membrane covered with ektexinous bodies and nanospines. Palynological characters related to pollen shape, mesoporia variation, pore number, pollen tectum sculpture, and arrangement and number of ektexinous bodies in the poral membrane, are identified as taxonomically important characters that can be used to recognize species in the genus. Here we provide the first palynological key for the 13 studied species of the Alternantheroid clade. Univariate, multivariate statistical methods (Principal Component Analysis) and character optimization using parsimony approaches indicate that the palynological variation may be phylogenetically informative. This study represents the most complete palynological review available for the Alternantheroid metareticulate pollen. Our studies highlight the need to develop a more precise palynological terminology to describe the mesoporium in Alternanthera and the typical metareticulate pollen found throughout Amaranthaceae.

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1 - Centro de Investigación Científica de Yucatán, Recursos Naturales, Centro de Investigación Científica de Yucatán, A.C. Calle 43 No. 130, Col. Chuburná de Hidalgo, Merida, Yucatán, 97200, México
2 - Indiana University, Biology, 915 E. Third Street Myers Hall 150, None, Bloomington, Indiana, 47401, USA

comparative morphology
Character evolution

Presentation Type: Recent Topics Poster
Session: P
Location: /
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PRT019
Abstract ID:1257
Candidate for Awards:None

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