Pollen Morphology of Tribes Gnaphalieae, Helenieae, Plucheeae and Senecioneae (Subfamily Asteroideae) of Compositae from Egypt

Ahmed Kamal El-Deen Osman
DOI: 10.4236/ajps.2011.22014                

Abstract

POLLEN morphology of twenty five species representing 12 genera of tribes Gnaphalieae, Helenieae, Plucheeae and Senecioneae (Asteroideae: Asteraceae) was investigated using light and scanning electron microscopy. The genera are Phagnalon, Filago, Gnaphalium, Helichrysum, Homognaphalium, Ifloga, Lasiopogon, Pseudognaphalium, Flaveria, Tagetes, Sphaeranthus and Senecio. Two pollen types were recognized viz. Senecio pollen type and Filago pollen type. Description of each type, a key to the investigated taxa as well as LM and SEM micrographs of pollen grains are provided.

Keywords

Pollen, Morphology, Asteroideae, Asteraceae, Egypt

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	A. A. Anderberg, “Taxonomy and phylogeny of the tribe Gnaphalieae (Asteraceae),” Opera Botanica Vol.104, 1991, pp. 1-195.
[2]	L. Boulos, “Flora of Egypt, Verbenaceae-Compositae”, Al-Hadara Publishing, Cairo, Vol. 3, 2002.
[3]	L. Boulos, “Flora of Egypt checklist, Revised annotated edition”, Al-Hadara Pblishing, Cairo, 2009.
[4]	K. Bremer, “Asteraceae. Cladistics and Classifications”, Timber Press Inc., Portland, OR., 1994.
[5]	M. T. Dimon, “Problémes généraux soulevés par l'étude pollinique de Composées méditerranénnes”, Nat. Monsp. Sér. Bot., Vol. 22, 1971, pp. 129-144.
[6]	M. N. El Hadidi, A. A. Fayed, “Materials for Excursion Flora of Egypt (EFE) ”, Taeckhol- mia, Vol. 15, 1994/1995, pp. 96–98.
[7]	G. Erdtman, “The acetolysis method, a revised description”, Svensk Bot. Tidskr, Vol. 54, 1960, pp. 561-464.
[8]	G. Erdtman, “Pollen Morphology and Plant Taxonomy, Angiosperms”, Hafner Publishing Co., New York, 1966.
[9]	G. Erdtman, “Handbook of Palynology, An Introduction to the Study of Pollen Grains and Spores”, Munksgaard, Copenhagen, 1969.
[10]	K. Faegri, J. Iversen, “Textbook of Pollen Analysis”, Ed. 3. Munksgaard, Copenhagen. J. R. Rowley, A. O. Dahl, J. S. Rowley, 1981. Substructure in exines of Artemisia vulgaris (Asteraceae). Review of Palaeobotany and Palynology, Vol. 35, 1975, pp. 1-38.
[11]	P. Leins, “Pollensystematische studien an Inuleen, I: Tarchonanthinae, Plucheinae, Inulinae, Buphthalminae”, Botanishe Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie Vol. 91, 1971, pp. 91-146.
[12]	P. Leins, “Pollensystematische studien an Inuleen, II: Filagininae”, Botanishe Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie, Vol. 93, 1973, pp. 603-611.
[13]	J. Muller, “Fossil pollen records of extant angiosperms”, Botanical Review, Vol. 47, 1981, 1-142.
[14]	J. J. Skvarla, D. A. Larson, “An electron microscopic study of pollen morphology in the Compositae with special reference to the Ambrosinae”, Grana Palynol., Vol. 6, 1965, pp. 210-269.
[15]	J. J. Skvarla, B. L. Turner, “Systematic implications from electron microscopic studies of Compositae pollen - A review”, Ann. Missouri Bot. Gard., Vol. 53, 1966, pp. 220-256.
[16]	J. J. Skvarla, B. L. Turner, V. C. Patel, A. S. Tomb, “Pollen morphology in the Compositae and in morphologically related families”, In : V. H. Heywood et al. (eds.). The Biology and Chemistry of Compositae, Vol. 2, 1977, pp. 141-265, London.
[17]	V. Tackholm, “Students' Flora of Egypt”, ed. 2., Cairo, 1974.
[18]	R. Tormo, J. L. Ubera Jimenez, “The apertural system of pollen grains in Anthemideae and Cardeae (Compositae) with special reference to the Mesoaperture”, Rev. Palaeobot. Palynol., Vol. 62, pp. 1990, 1-9.
[19]	M. S. Zavada, De S. E. Villiers, “Pollen of the Asteraceae from the Paleocene-Eocene of South Africa”, Grana, Vol. 39, 2000, pp. 39-45.