Pollen morphology of some genus in Iridaceae Juss

The Iridaceae family of includes 92 genus and 1800 species distributed in the various regions of the planet, especially in South Africa and the American Tropicalterritories. Pollen grains of studied species were investigated by light microscopy (14 sp.), scanning electron microscopy (SEM) (7 sp.) and transmission electron microscopy (TEM) (5 sp.). The outline for all of the pollen grain studied in polar view and equatorial view. Our results showed that Pollen grains were very large (only Iris hymenospatha B. Mathew & Wendelbo), large (10 sp.), medium size (3 sp.), spheroidal, oblatespheroidal and oblate form, macroreticular, reticular, echinate-micro foveolate and microechinate-foveate. In addition, these species differ from each other by the surface of membrane sulcus, by structure and width of muri, size of lumina. Our research results using the TEM that these species from each other by the thickness of ectexine (thickness of tectum and foot-layer, height, and width of columns), by different layers of intine, by presence or absence of endexine, by shape and diameter in caput of columns. The maximal thickness of tectum in Iris reticulate M. Bieb. 0/66 – 1/33μm and minimal in Crocus pallasii Goldb. 0/4 – 0/57. The shape of caput (head of columns) in wall pollen grains in most of the studied species were fungi form. The microrelief for all of the species it is smooth. Thus, our micromorphological investigated has shown the big variety of a pollen grains structure in different genus and species of Iridaceae family.

Keywords:

Exine , Iridaceae , Pollen grain , SEM , TEM