TAILIEUCHUNG - Pollen morphology of six Achillea L. sect. Achillea (Asteraceae) species in Turkey
The structure of the exine is double tectate and mean exine thickness varied from 3 to μm. The pollen ornamentations are echinate in LM and echinate-microperforate and echinate-rugulatemicroperforate in SEM. In conclusion, the species examined showed substantial variation in pollen characteristics, at both the interspecific and intraspecific levels. | H. AKYALÇIN, T. ARABACI, B. YILDIZ Research Article Turk J Bot 35 (2011) 183-201 © TÜBİTAK doi: Pollen morphology of six Achillea L. sect. Achillea (Asteraceae) species in Turkey Hanife AKYALÇIN1,*, Turan ARABACI2, Bayram YILDIZ3 1 Çanakkale Onsekiz Mart University, Faculty of Science and Arts, Department of Biology, Çanakkale - TURKEY 2 İnönü University, Faculty of Science and Arts, Department of Biology, Malatya - TURKEY 3 Balıkesir University, Faculty of Science and Arts, Department of Biology, Balıkesir - TURKEY Received: Accepted: Abstract: The pollen morphology of 48 specimens of 6 species (9 taxa) of the genus Achillea L. sect. Achillea (Asteraceae), A. nobilis L. subsp. neilreichii (.) Formánek, A. nobilis subsp. densissima ( ex Bässler) ., A. nobilis subsp. sipylea () Bässler, A. nobilis subsp. kurdica ., A. filipendulina Lam., A. clypeolata Sm., A. coarctata Poir., A. biebersteinii Afan., and A. cappadocica Hausskn. & Bornm. distributed in Turkey were investigated using light (LM) and scanning electron microscopy (SEM). The pollen grains were oblate-spheroidal, prolatespheroidal, subprolate and generally tricolporate, though at times tetracolporate or even pentacolporate. The size of the grains varied, ranging from to μm on the polar axis mean and from to μm on the equatorial axis mean. Their outline is oval, compressed oval, or circular in the meridional optical section and trilobulate or sometimes tetralobullate in the polar optical section. The structure of the exine is double tectate and mean exine thickness varied from 3 to μm. The pollen ornamentations are echinate in LM and echinate-microperforate and echinate-rugulatemicroperforate in SEM. In conclusion, the species examined showed substantial variation in pollen characteristics, at both the interspecific and intraspecific levels. Key words: Achillea, Compositae, LM, pollen morphology,
đang nạp các trang xem trước
