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Title of Journal: Plant Syst Evol

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Abbravation: Plant Systematics and Evolution

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Springer Vienna

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DOI

10.1016/j.agee.2015.01.007

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1615-6110

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Palynological survey of the subtribe Elephantopina

Authors: María C Tellería
Publish Date: 2012/04/01
Volume: 298, Issue: 6, Pages: 1133-1139
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Abstract

Despite the taxonomic value of pollen morphology within the tribe Vernonieae a detailed study of the pollen of the subtribe Elephantopinae is still lacking The pollen morphology of ten species representing three of the four genera of the subtribe Elephantopus Pseudoelephantopus and Orthopappus was studied with LM SEM and TEM The pollen of all the species studied was found to be echinolophate although the differences in aperture features and both sculpture and exine structure allowed recognizing two pollen types The species of Elephantopus except for E elongatus and Pseudoelephantopus share the regular or more or less regular ridges pattern the colporate condition but with the ectoapertures little developed and the acaveate exine structure From the sculpture and the apertures the pollen of Caatinganthus harleyi was found to be similar to that of Elephantopus and Pseudoelephantopus The pollen morphology of the monotypic Orthopappus which is shared with that of E elongatus was further investigated for the first time We found that it differs from that of the other species in having an irregular pattern of ridges colporate condition but with a welldeveloped ectoapertures and caveate exine Additional studies of the exine structure and apertures features coupled with molecular phylogeny are needed to understand the evolution of pollen characters and reevaluate the intergeneric relationships within the tribeI would like thank Gisela Sancho and anonymous reviewers for their helpful comments on the manuscript This work was supported by Consejo Nacional de Investigaciones Científicas y Técnicas CONICET Argentina PIP 02340 and Agencia Nacional de Promoción Científica y Tecnológica PICT no 01977 I would like to thank to curators of the herbaria who let us remove the pollen studied here to the SEM services of the Facultad de Ciencias Naturales y Museo de La Plata and to the TEM services of the Facultad de Veterinaria of the Universidad Nacional de La Plata

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