Development of the Ovule and Megagametophyte in Wisteria sinensis

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Abstract
Eight campylotropous ovules initiate development from primordia on the placental ridge in the ovary of Wisteria sinensis Sweet. Integumentary primordia arise from the nucellar mass, and the ovules arch toward the stylar region of the ovary. Usually a hypo-dermal archesporial cell gives rise to a primary sporogenous cell which enlarges to form the megasporocyte. Subsequent meiotic divisions show that monosporic or bisporic megagametogenesis can occur. Three antipodals organize in the chalazal region but rapidly disintegrate. The synergids form in the micropylar region of the embryo sac and undergo dissolution before fertilization, leaving the egg cell and fused polar nuclei present at fertilization. The ovule at maturity has a micropylar canal which consists of an exostome, a mesostome, and an endostome,.

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