USE OF POLLEN MORPHOLOGY TRAITS FOR IDENTIFYING SPECIES OF CENTAUREA L. ASTERACEAE IN KURDISTAN-IRAQ
Science Journal of University of Zakho (Issue : 4) (Volume : 8)
The polleniferous material of Centaurea taxa grow in Kurdistan-Iraq was collected. Samples were tested using scanning electron
microscopy (SEM) and light microscopy (LM). In the polar view, pollen grain outlines are mostly triangular or triangular-circular.
In equatorial view, the elliptic shape is common, while circulars or semicircular shapes are rare. The exine sculpture is scabrate,
and the tectum is perforate. Number of sculpture microspinules/ μm², and their heights together with the number of wall perforations
provide significant characters for taxa delimitation. Pollen grains of all species are of medium size, very few of some species pollen
are larger or smaller in size. Species producing subprolate pollen shape is common, while oblate spheroidal and Prolate spheroidal
shapes are less common. The principal component analysis and the discriminant analysis can recognize 65.478% and 87.54% of
the total variability respectively; moreover, the discriminant function can correctly classify 125 or 78.125% out of 160 observations
for pollen traits.