Fig. 1

Megasporogenesis of Polianthes tuberosa var. Simple. a Cross-section of an ovule showing the condensed nucleus of a megaspore mother cell. b Megaspore mother cell located at the micropylar extreme of the ovule. c Diad. d Linear tetrad. e Triad. Dark or black spaces are vacuoles. f “T” shaped tetrad. mmcn megaspore mother cell nucleus, mmcc megaspore mother cell chromatin, mmc megaspore mother cell, in integuments, arrow heads in (a) sub-epidermic cells of the ovule, c chalaza, m micropyle, d1 and d2 diad cells, white arrows triad cells, arrow head in d and f cells of a tetrad, dotted lines in f “T” formation of a tetrad. Bars 10 µm