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A Search for Phylogenetically Informative Pollen Characters in the Subtribe Salviinae (Mentheae: Lamiaceae)
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A Search for Phylogenetically Informative Pollen Characters in the Subtribe Salviinae (Mentheae: Lamiaceae)

Author: Hye‐Kyoung Moon; Stefan Vinckier; Jay B Walker; Erik Smets; Suzy Huysmans
Edition/Format: Article Article
Publication:International Journal of Plant Sciences, v169 n3 (200803): 455-471
Other Databases: WorldCatWorldCatWorldCat
Summary:
The pollen morphology and ultrastructure of the subtribe Salviinae were investigated with light, scanning electron, and transmission electron microscopy. In addition, cladistic analyses of the obtained morphological data, supplemented with rbcL data from GenBank, were conducted in order to assess the phylogenetic signal of palynological characters. Salviinae pollen is small to large, oblate to prolate in shape, with  Read more...
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Document Type: Article
All Authors / Contributors: Hye‐Kyoung Moon; Stefan Vinckier; Jay B Walker; Erik Smets; Suzy Huysmans
ISSN:1058-5893
Unique Identifier: 5551098061
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Abstract:

The pollen morphology and ultrastructure of the subtribe Salviinae were investigated with light, scanning electron, and transmission electron microscopy. In addition, cladistic analyses of the obtained morphological data, supplemented with rbcL data from GenBank, were conducted in order to assess the phylogenetic signal of palynological characters. Salviinae pollen is small to large, oblate to prolate in shape, with a circular to slightly elliptic amb, and mostly hexacolpate. Perovskia abrotanoides appears to be distylous and shows a significant pollen dimorphism between pin and thrum flowers. The sexine ornamentation of the genera Lepechinia and Chaunostoma is perforate, while the ornamentation of other genera is bireticulate. Perovskia expresses a unique type of sexine ornamentation. The sexine ornamentation variation in Salvia has systematic importance but only partly corresponds with current phylogenetic hypotheses. Unbranched columellae and a continuous, granular endexine are hypothesized to be a symplesiomorphic condition in the tribe Mentheae. Our combined phylogenetic analyses show that the addition of palynological characters contributes to improved resolution and also increases bootstrap support values in comparison with molecular phylogenetic analyses.

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The pollen morphology and ultrastructure of the subtribe Salviinae were investigated with light, scanning electron, and transmission electron microscopy. In addition, cladistic analyses of the obtained morphological data, supplemented withrbcLdata from GenBank, were conducted in order to assess the phylogenetic signal of palynological characters. Salviinae pollen is small to large, oblate to prolate in shape, with a circular to slightly elliptic amb, and mostly hexacolpate.Perovskia abrotanoidesappears to be distylous and shows a significant pollen dimorphism between pin and thrum flowers. The sexine ornamentation of the generaLepechiniaandChaunostomais perforate, while the ornamentation of other genera is bireticulate.Perovskiaexpresses a unique type of sexine ornamentation. The sexine ornamentation variation inSalviahas systematic importance but only partly corresponds with current phylogenetic hypotheses. Unbranched columellae and a continuous, granular endexine are hypothesized to be a symplesiomorphic condition in the tribe Mentheae. Our combined phylogenetic analyses show that the addition of palynological characters contributes to improved resolution and also increases bootstrap support values in comparison with molecular phylogenetic analyses.

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