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- W3324144 abstract "The development of embryo sac in Allium thumberglZ Was investigated uslng a light and an electron microscope. Two ovules, which are composed of a thin curved nucellus invested with two integuments, are formed in each of three ovarian locules which are formed in a ovary. The ovule seems to be campylotropus. The nucellus has no parietal cells and is tenuinucellate. The embryo sac is formed ac- cording to the bisporic eight nucleate Allium type of development. Not a few organelles occur in the cells in the meiosis and in the developing embryo sacs. In the cells con- structing a 7-celled mature embryo sac, mitochondria become to be distinguished from plastids in their internal structure and in a stain property of their matrix. There are not a few plastids with a starch grain in these cell. Furthermore, lipid grains are vieved in these cells, though they are not viewed in the cells during the meiosis and in the developlng embryo sacs. These cells in the 7-Gelled mature embryo sac are outlined with a thin wall constructed of the substance stained with ruthenium red in the thin sections. In the embryo sac where one of synergids has already degenerated, the thin wall is disappeared and instead of the wall, a cell membrane is formed along the disappeared Ⅵrall. In the boundary betⅥreen the cells of egg apparatus and central ceu, the formation of cell wall for dividing them is lag behind. Along the boundary, two cell membranes are in close contact with each other, though the interruptions in the contacts occur. Some interruptions contain the substance stained with ruthenium r-ed and others do not. It seems that the formation of cell membrane and cell wall in the unfertilized egg cell or/and the fertilized egg cell starts from the formation of the thin wall constructed of the substance stained with ruthenium red in the 7- celled young mature embryo sac." @default.
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- W3324144 date "1989-10-31" @default.
- W3324144 modified "2023-09-28" @default.
- W3324144 title "Embryo Sac Formation in Allium thunbergii, with Transmission Electron Microscope Observation" @default.
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