Institute of Horticultural Research (ICAR), Hessaraghatta, Mysore State
*A part of M. Sc. thesis submitted by the senior author to the Post Graduate School, Indian Agricultural Research Institute, New Delhi, during 1963.
In V. vinifera L. a group of hypodermal archesporial cells differentiates in each lobe, when anthers become four lobed. The anther wall comprises an epidermis, a fibrous endothecium, 1 or 2 middle layers and a glandular tapetum with multinucleate cells. Reduction divisions are simultaneous and cytokinesis is by furrowing. Tetrads are tetrahedral, isobilateral or decussate. The pollen grains are triporate and 2-celled. Ovules are anatropous, crassinucellate and bitegmic. The micropyle is formed by inner integument. Nucellar cap and hypostase are present. The female arches-porium is unicellular and hypodermal. The megaspore tetrads are linear of which the chalazal spore functions. The development of embryo sac is of the polygonum type. The egg is flask-shaped, synergids are beaked and the antipodal cells degenerate soon. The polar nuclei fuse in the centre of the embryo sac.
