Pollen morphology of selected species of the genera Chrysodracon and Dracaena (Asparagaceae, subfamily Nolinoideae) and its systematic implications

Pollen morphology of selected species of the genera Chrysodracon and Dracaena (Asparagaceae,... Pollen grains of 3 species from the genus Chrysodracon and 20 species from the genus Dracaena were examined by light, scanning electron and fluorescence microscopy. The basic shape of the pollen grains is subprolate and prolate, but prolate-spheroidal pollen grains may also be found. Pollen of Chrysodracon and Dracaeana is dispersed as monads, rarely as dyads. In terms of size, the pollen grains studied were classified as medium-sized and large. There are two different types of apertures: monosulcate and monoulcerate in Dracaena and monoulcerate in Chrysodracon. The surface of the non-apertural areas is psilate-perforate, irregularly folded, microreticulate and fossulate. Ornamentation of the apertural region is microreticulate, microreticulate-baculate, baculate, psilate-perforate, psilate-perforate-verrucate, granulate and irregularly folded. Irregular perforations are present, and the wall structure is tectate-columellate. Our results suggest that some species of Chrysodracon and Dracaena may be separated based on their pollen grain micromorphology on the distal region. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Systematics and Evolution Springer Journals

Pollen morphology of selected species of the genera Chrysodracon and Dracaena (Asparagaceae, subfamily Nolinoideae) and its systematic implications

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Publisher
Springer Journals
Copyright
Copyright © 2018 by The Author(s)
Subject
Life Sciences; Plant Sciences; Plant Ecology; Plant Anatomy/Development; Plant Systematics/Taxonomy/Biogeography
ISSN
0378-2697
eISSN
2199-6881
D.O.I.
10.1007/s00606-017-1486-8
Publisher site
See Article on Publisher Site

Abstract

Pollen grains of 3 species from the genus Chrysodracon and 20 species from the genus Dracaena were examined by light, scanning electron and fluorescence microscopy. The basic shape of the pollen grains is subprolate and prolate, but prolate-spheroidal pollen grains may also be found. Pollen of Chrysodracon and Dracaeana is dispersed as monads, rarely as dyads. In terms of size, the pollen grains studied were classified as medium-sized and large. There are two different types of apertures: monosulcate and monoulcerate in Dracaena and monoulcerate in Chrysodracon. The surface of the non-apertural areas is psilate-perforate, irregularly folded, microreticulate and fossulate. Ornamentation of the apertural region is microreticulate, microreticulate-baculate, baculate, psilate-perforate, psilate-perforate-verrucate, granulate and irregularly folded. Irregular perforations are present, and the wall structure is tectate-columellate. Our results suggest that some species of Chrysodracon and Dracaena may be separated based on their pollen grain micromorphology on the distal region.

Journal

Plant Systematics and EvolutionSpringer Journals

Published: Jan 19, 2018

References

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