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STRUCTURE AND DEVELOPNENT OF OVULE AND importanferMALE GAMIETOPHYTE

1. {"Ovules, which are borne on the placenta in the ovary, develop into seeds after fertilization.","Structure and development of the ovule (Megasporangium). The ovule has a massive parenchymatous body, called nucellus. It is enclosed and protected by one or two sheaths, known as integuments. The ovules with a single integument are said to be unitegmic and with two integuments, bitegmic. The integuments completely cover the nucellus, leaving only a small opening at one end, called micropyle. The ovule is attached to the placenta by a stalk, known as funicle, and the point of attachment of the body of the ovule to the funicle is called hilum. The basal part of the ovule where nucellus, integuments and funicle merge is known as chalaza (Fig. 20).","as a hemispherical protuberance which grows into a projecting mass of tissue; the nucellus. Integuments arise as complete rings below the nucellar apex. The inner integument, which is usually formed first, initiates from the epidermal layer and the outer integument from the sub-epidermal integument is slower than that of the inner integument. The integuments soon cover the nucellus, leaving a small opening at the","Fig. 20. Structure of an ovule. tip, the micropyle."}

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Updated on: Sep 14, 2022