%0 Journal Article
%A G.N.V. Febulaus and T. Pullaiah
%T Embryology of Aristida (Poaceae)
%D 1993
%J Taiwania
%V 38
%N 1,2
%P 38-48
%U https://taiwania.ntu.edu.tw/abstract/224
%X Embryology of Aristida funiculate, A. hystrix, A. mutabilis and A. setacea has been studied. The anthers are tetrasporangiate. The anther wall comprises of an epidermis, endothecium, middle layer and tapetum. The anther tapetum is of the Glandular type and its cells become 2-to 4-nucleate. Endothecium develops fibrous thickenings when the pollen grains are at 2-celled stage. Meiosis is normal and successive cytokinesis leads to the formation of isobilateral microspore tetrads. Pollen grains are monoporate and 3-celled at the time of shedding. Supernumerary nuclei have been observed in pollen grains of A. hystrix. The ovule is hemianatropous, bitegmic and pseudocrassinucellate. However in A. funiculate and A. setacea ovules are tenuinucellate. Meiosis in megaspore mother cell leads to the formation of either ‘T’-shaped or linear tetrad of megaspores. The chalazal megaspore of the tetrad is functional and develops into Monosporic Polygonum type of embryo sac. The number of antipodals varies from 3 to 13. Endosperm development is of the Nuclear type and the embryo development conforms to the Asterad type.
%M doi:10.6165/tai.1993.38.38