Open AccessBiological features of Crocus speciosus M. Bieb. (Iridaceae family)
Author(s) -
Н. Н. Мирошниченко,
С В Шевченко
Publication year - 2022
Publication title -
bûlletenʹ gosudarstvennogo nikitskogo botaničeskogo sada
Language(s) - English
Resource type - Journals
ISSN - 0513-1634
DOI - 10.36305/0513-1634-2021-141-36-43
Subject(s) - tapetum , stamen , ovule , epidermis (zoology) , pollen , botany , biology , sporopollenin , microspore , megaspore , pollination , anatomy
The paper presents the results of studying the decorative species Crocus speciosus. Some features of the formation and development of male and female generative spheres are presented. It is shown that the formed anther wall is generated by the epidermis, endothecium, middle layer and tapetum. The wall of the mature anther is formed by the epidermis, fibrous endothecium with fibrous thickening, and a tapetal spathella with sporopollenin orbicles. Analysis of mature pollen grains showed a rather high proportion of normal pollen grains (80%), which under favorable conditions indicates a high ability to effectively pollinate. The characteristics of the female generative sphere are also shown: three-celled ovary; anatropic, bitegmal, funicular, crassinucellate ovule; linear tetrad of megaspores; Polygonum-type of embryonic sac development. The processes of flowering, pollination and seed formation are described.