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Structure of mature embryo sac

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The classification is based on the number of 9 ses or spore nuclei entering into the formation of embryo sac thus embryo sac may be monosporic, bisporic or tetrasporic tyr the number, arrangement, and chromosome number of the nuclei in the mature embryo sac. It includes 3 antipodal towards chalazal end and an egg apparatus ( a single egg and 2 synergids) towards micropylar end. Other articles where embryo sac is discussed angiosperm general characteristics gametophyte of angiosperms (called the embryo sac) is tiny and contains only a few (typically eight) nuclei the cytoplasm associated more or less directly with these nuclei is not partitioned by cell walls. Ovule and embryo sac development 1293 during megagametogenesis produce the mature embryo sac. Considerable diversity in the pattern of embryo sac develop- ment is found among plant species. Figure 2 shows a small representative sample of some of the modes of embryo sac development that have been observed (see also russell, 1993, this issue). A typical embryo sac is ellipsoidal in structure with tapering ends and it is made up of cellulosic cell wall. Embryo sac is present at the centre of the nucellus of the ovule. It is seven celled and eight nucleated structure which is composed of three celled egg apparatus, three antipodals and a bi nucleated central cell or secondary nucleus. A, normal structure of a mature embryo sac of diploid rice (liaojing 944-2x), shows the egg (e), synergid (s), polar nuclei (p) and antipodal (a) b, normal structure of a mature embryo sac of autotetraploid rice (guangluai 4-4x) c, embryo sac without female germ unit (arrow).   the ovule is the most important reproductive organ in the pistil of phanerogamae. Camellia oleifera (theaceae) is an important woody plant producing edible oil in southern china, and its embryo sac structure has a positive effect on seed breeding. In this study, the microstructure, ultrastructure and threedimensional structure of the ovule and embryo sac of c. The ovule in plants is a structure that encloses the reproductive cells in females which contains the nucleus, the integument and the female gametophyte. The embryo sac or female gametophyte is an oval structure present in the ovule of flowering plants. An embryo sac is said to form when the haploid megaspore nucleus divides.

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