Development of embryonic structures of Hablitzia (Chenopodiaceae)

摘要

The processes of anther, ovule and seed development were traced for the first time in Hablitzia tamnoides. All basic embryological features were determined. The formation of the 4-layered wall of the anther occurs according to the Monocotyledonous type; the tapctum is cellular without reorganization, with orbicules; the microspore tetrads are formed simultaneously; the mature pollen grain is 3-celled. The ovule is anacampylotropous, with 2 bilayered integuments, crassinucellate. The archesporium isunicellular, the embryo sac develops according to the Polygonum-type; the endospermogenesis is of the Nuclear type, the embryogenesis is of the Chenopodiad-type. At the centre of the mature seed there is a massive perisperm, the embryo is well-differentiated, ringshaped. The seed coat is exotesta-endotegminal. Hablitzia completely corresponds to the complex of Chenopodiaceae embryological features.