The seed’s ultrastructure of genus Iris L. s.l. (Iridaceae) species from Ukrainian Carpathians

O. A. Futorna, S. L. Zhygalova, V. A. Badanina

Abstract


We have studied the ultrastructure of five species of genus Iris L., which grow in the Ukrainian Carpathians – I. aphylla L., I.graminea L., I. pseudacorus L., I. sibirica L. and I. sintenisii Janka. We have found that in shape seeds are rounded-fusiform (I. aphylla), D-shaped (I. pseudacorus, I. sibirica, I.graminea), pyriform (I. sintenisii). The hilum is rounded or drop-shaped, small, by position – basal (I. graminea), with well-seen roll (I. graminea, I. aphylla). The seeds of I. sibirica and I. pseudacorus have wing, that surround all the seed (wing is smaller in seeds of I. pseudacorus). The wings are absent in seeds of other species. Тhe curvature of anticlinal cell walls (straight) is common for all studied species. The seeds of all examined species characterized by polygonal cells of testa, they are isodiametric (I. aphylla, I. sintenisii, I. graminea), or prolonged (I. sibirica, I. pseudacorus) – mostly on the wing. The boundaries of cells of testa are practically not visible, anticlinal cell walls are tightly merged only in I. sintenisii seeds, in other species seeds they are seen. The anticlinal cell walls in I. aphylla and I. graminea are raised in relation to surface of periclinal cell walls. The outer periclinal cell walls are concave (I. sintenisii, I. aphylla), flat (I. graminea), or convex (I. pseudacorus, I. sibirica). The sculpture of outer periclinal cell walls is smooth (I. graminea, I. sintenisii, I. aphylla), or furrowed (I. sibirica, I. pseudacorus). Considering all the above features, we concluded that seeds of studied species are characterized by coliculate (I. sibirica, I. pseudacorus), reticulate (I. aphylla), indistinct-coliculate with slightly convex periclinal cell walls (I. graminea) or indistinct-cellular (I. sintenisii) relief.

Keywords


Iris s.l.; seed ultrastructure; seeds testa; Ukrainian Carpathians; SEM

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DOI: http://dx.doi.org/10.15421/2018_181

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© 2017 Ukrainian Journal of Ecology. ISSN 2520-2138