
TY  - JOUR
A1  - Want, G 
T1  - Sporogenesis, Gametogenesis, and embryogeny of <I>Wahlenbergia bicolor</I> N. Lothian
JF  - Australian Journal of Botany
JO  - Aust. J. Bot.
Y1  - 1963
VL  - 11
IS  - 2
SP  - 152
EP  - 167
KW  - 
UR  - https://doi.org/10.1071/BT9630152 
N2  - In Wahlenbergia bicolor, the anther wall is composed of four layers: epidermis, endothecium, middle layer, and tapetum. Wall formation and microsporogenesis are described, and the pollen grains are shed at the two-celled condition. The ovules are tenuinucellate, with a hypodermal archesporial cell which develops directly as the megaspore mother cell. Megasporogenesis is normal, and a monosporic eight-nucleate embryo sac of the most common Polygonum type develops from the chalazal megaspore. The antipodals degenerate before fertilization. The development of the embryo is of the solanad type. A suspected case of polyembryony was observed. The endosperm is cellular from its inception, and so conforms to the Codonopsis type. A micropylar and a chalazal haustoriurn, both consisting of two uninucleate cells, are formed from the endosperm. Comparative studies were made with a known but as yet undescribed coastal species of Wahlenbergia, and no differences were found. 
ER  -

