You can manage bookmarks using lists, please log in to your user account for this.
Media type:
E-Article
Title:
Development of the Seed of Millettia ovalifolia
Contributor:
Pal, Niranjan
Published:
The University of Chicago Press, 1960
Published in:
Botanical Gazette, 122 (1960) 2, Seite 130-137
Language:
English
ISSN:
0006-8071
Origination:
Footnote:
Description:
1. In Millettia ovalifolia Kurz. the cells of the anther tapetum are uninucleate and secretory. Pollen grains are prolate spheroidal and tricolporate; the sexine is thinner than nexine. They are shed in the three-nucleate condition. 2. The ovules are campylotropous, bitegmic, and crassinucellate with nucellar caps. The inner integument is shorter than the nucellus, and the zigzag micropyle is formed mostly by the outer integument. The single hypodermal archesporial cell divides to an outer parietal cell and an inner sporogenous cell which functions as the megaspore mother cell. A linear tetrad of megaspores is formed of which, normally, the chalazal one functions. The embryo sac development follows the "Polygonum type." Fusion of the polar nuclei takes place long before fertilization, which is porogamous and normal. Endosperm development is of the "nuclear type," but cell formation occurs at a late stage. 3. The development of the embryo follows Period I, Series B1, Megarchetype VI of Soueges' system of classification or the "Lotus variation" of "Onagrad type" of Johansen's system. The suspensor shows variations in structure. A single nucellar embryo was found. 4. The mature seed is non-endospermic. The tegmen is absent. The structure of the testa agrees in general with the Papilionaceous type of Corner (11). A majority of the seeds are degenerated, malformed, and/or contaminated with a fungus.