Development of Ovule and Embryo Sac of Cocos Nucifera

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Abstract
The axis of the flower develops long before the emergence of the inflorescence from the outer spathe, and the ovules develop after it has escaped from the spathe. Embryo sac development is completed at about the stage when the stigma is receptive. The ovules are cauline, arising from the central axis of the flower. The floral axis bulges out, and papillae which serve as the nucellus of the nascent ovules are pushed toward each loculus of the ovary. The inner and outer integuments develop in succession. The archesporium is one-celled; it does not cut off any parietal cell, but functions directly as the megaspore mother cell. This cell divides in the usual manner, and produces the normal 8-nucleate embryo-sac. The polar nuclei fuse just after the opening of the inflorescence and before the degeneration of the antipodals and synergids. The polar nuclei migrate toward the center of the sac, where they fuse.
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