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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Pollen morphology of Brazilian species of Vriesea (Bromeliaceae, Tillandsioideae)

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Dos Santos, Valeria Leobina [1] ; Das Gracas Lapa Wanderley, Maria [2] ; Versieux, Leonardo M. [3] ; Pinto Da Luz, Cynthia Fernandes [1]
Total Authors: 4
[1] Inst Bot, Nucl Pesquisa Palinol, Sao Paulo - Brazil
[2] Inst Bot, Nucl Pesquisa Curadoria Herbario, Sao Paulo - Brazil
[3] Univ Fed Rio Grande do Norte, Dept Bot & Zool, Natal, RN - Brazil
Total Affiliations: 3
Document type: Journal article
Source: GRANA; NOV 2019.
Web of Science Citations: 0

As a contribution to the infrageneric delimitation in the genus Vriesea pollen morphology of 17 species of the genus is described, with original data for 14 of the species. The pollen grains are heteropolar, with ellipsoidal amb, monosulcate, sulci marginate, reticulate with calota microreticulate or psilate-perforate. Variations in the dimensions of the structures, presence or absence of microreticula surrounding the lumina of the reticulum, type of ornamentation on the equatorial calota, difference in the exine thickness, and walls simplecolumellate or duplicolumellate, have helped in the separation of groups, and were important for the Palynotaxonomy of the genus. Proximity between species previously grouped by vegetative, reproductive and/or anatomical structures similarity, was confirmed for V. friburgensis and V. neoglutinosa, and for V. medusa and V. nanuzae. Vriesea bituminosa and V. neoglutinosa have demonstrated to share palynological similarities, although belonging to different sections, Xiphion and Vriesea, respectively. The pollen grains of V. flava and V. philippocoburgii, both from section Vriesea, were very similar, despite neither presenting similarities in the reproductive characters nor a close molecular phylogenetic relationship, thus suggesting a convergent evolution for this character. Such findings confirm the weakness of the delimitations of these two sections reported by previous studies. Our results allowed an improved morphological characterisation of genus Vriesea and could contributed to a biossytematic approach towards the resolution of species complexes. (AU)

FAPESP's process: 13/22881-9 - Palynotaxonomy of Alcantarea (E. Morren Ex Mez) Harms, a genus segregated from Vriesea Lindl (Bromeliaceae Juss)
Grantee:Valéria Leobina dos Santos
Support type: Scholarships in Brazil - Master
FAPESP's process: 17/50341-0 - Challenges for biodiversity conservation facing climate changes, pollution, land use and occupation (PDIP)
Grantee:Luiz Mauro Barbosa
Support type: Research Grants - State Research Institutes Modernization Program