engleski

Pollen morphology in Croatian species of the Genus Iris (Iridaceae)

Pollen grains of 11 Iris species grown in Croatia, were analysed by scanning electron microscope: Iris adriatica Trinajstić ex Mitić, I. croatica Horvat et Horvat, I. errhirhiza Posp., I. germanica L., I. graminea L., I. illyrica Tomm., I. pallida Lam., I. pseudacorus L., I. pseudopallida Trinajstić, I. sibirica L. and I. variegata L. The pollen samples of all species were obtained from field collections, exccept for the garden clones of I. germanica and I. pallida. All of the pollen grains of the Iris species investigated are sulacate and, due to the sculpturing of their surface, we can distinguish several groups. The largest one, comprehense species I. croatica, I. germanica, I. illyrica I. pallida, I. pseudopallida and I. variegata, with reticulate sculpturing of the exine and large lumen. In second group there are species I. pseudacorus and I. sibirica, which pollen grains have almost microreticulate sculpturing and much smaller lumen.The three species - I. graminea, I. adritica and I. errhirhiza are separated totally from others and from each other concerning their pollen morphology. Pollen grains of I. graminea are the smallest in the whole sample and its sulcus is longer than by the others. Also exine sculpturing is microreticulat. Pollen grains of the I. adritica are very large, with granulate sculpturing and lot of gemmae. Pollen grains of I. errhirhiza are totally different from the others, with sculptured both with reticulum and gemmae, what implicate its possible hybridogenous origin.

pollen morphology; Genus Iris; Iridaceae; Croatia

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