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Ovule and Embryo Development in Doritis pulcherrima (Orchidaceae)

Saburo Yasugi
American Journal of Botany
Vol. 70, No. 4 (Apr., 1983), pp. 555-560
Stable URL: http://www.jstor.org/stable/2443166
Page Count: 6
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Ovule and Embryo Development in Doritis pulcherrima (Orchidaceae)
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Abstract

The placental ridge began to proliferate 10 days after pollination. Megaspore mother cell underwent meiosis to form two dyads at first division. At 50 days two megaspores and generating dyad were formed by second division. The functional megaspore divided successively three times to form an eight-nucleate embryo sac at 60 days. Double fertilization occurred forming the zygote and endosperm initial cell. However, the endosperm initial cell degenerate soon thereafter. The zygote divided to form a terminal cell, the middle cell and suspensor initial cell at 70 days. The terminal and middle cells successively divided to form a multi-celled embryo up to 120 days after pollination. Histochemical study showed that the stainability of DNA, RNA and total proteins were almost constant during ovule and embryo development. Stainability of total carbohydrates decreased.

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