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Abstract Detail



Systematics Section/ASPT

Song, Jun-Ho [1], Hong, Suk-Pyo [1].

Systematics of the tribe Sorbarieae (Spiraeoideae-Rosaceae): Palynological characters and molecular data (nuclear ribosomal ITS).

The pollen morphology of tribe Sorbarieae (Adenostoma, Chamaebatiaria, Sorbaria and Spiraeanthus) and two taxa of the related genus Lyonothamnus was investigated with light, scanning electron, and transmission electron microscopy. The Sorbarieae pollen grains are monads, tricolporate, and small to medium size (P = 15.0-40.0 μm, E = 12.0-32.0 μm), prolate to oblate in shape (P/E = 0.74-1.88). Three distinct types of exine ornamentation are observed in Sorbarieae: Striate, striate-perforate, striate-microechinate. The pollen wall stratification of representative taxa is characterized by unbranched columellae and a continuous endexine. Exine thickness of Lyonothamnus is about twice as thick as that of the tribe Sorbarieae. Orbicules are mostly tiny smooth surface spherical on the inner locule wall in all taxa studied. A preliminary phylogenetic analyses of the tribe Sorbarieae including Lyonothamnus was carried out based on internal transcribed spacers (ITS) of nuclear ribosomal DNA in order to assess the phylogenetic application of the present palynological characters. The exine ornamentation of the tribe Sorbarieae has systematic importance, but only in part corresponds with the present phylogenetic analysis. The intergeneric relationships in the tribe Sorbarieae based on the present palynological and molecular data are re-evaluated and briefly discussed.

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1 - Kyung Hee University, Department of Biology, 1 Hoegi-Dong, Dongdaemun-Gu, Seoul, 130-701, South Korea

Keywords:
Sorbarieae
Rosaceae
Palynology 
nrITS
Systematics.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PSY027
Abstract ID:361
Candidate for Awards:None


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