Pollen and Achene Morphology of Some Centaurea L. Taxa (Asteraceae), Turkey

Year 2018, Volume: 18 Issue: 2, 26 - 36, 28.12.2018

Oktay Bıyıklıoğlu Talip Çeter Barış Bani

Abstract

Centaurea is one of the largest genus of the family
Asteraceae. Turkey is one of the distribution areas of this genus. This genus
represented with 194 taxa in Turkey, which 105 of them are endemics. In this
study, pollen morphology and achene micro and macro morphology of 5 taxa
belonging to Centaurea (C. iberica, C. virgata, C. cheirolopha, C.
urvelli subsp. urvelli, C. solstitialis
subsp. solstitialis) were
investigated. The aim of the study was to determine taxonomic value of pollen
and achene micro features.

Pollen
grains of Centaurea taxa observed as
isopolar, with tricolporate aperture and subprolate and prolate-spheroidal
pollen shape. Polar axis ranges between 30.4-49.9 µm while equatorial axis
between 25.7-41 µm. 

The
achene shape was observed as ovoid and oblong in studied taxa. SEM showed that
the achene surface had a striate sculpture and was depressed on both lateral
surfaces, without rare hairs.

The micro
characters contain polar axis, equatorial axis, pollen shape, pollen surface
ornamentation, intine and exine thickness, achene length, Pappus length, achene
surface ornamentation was determined as important features for systematics of
taxa.

Keywords

Centaurea, Pollen, Achene, Light microscopy (LM), Scanning Electron Microscopy (SEM)

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