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The Ultrastructural Observation on Megaspore Degeneration of Tobacco
Mei-Zhen Lin, Li-Li Ge1, Hui-Qiao Tian1*
Department of Pharmacy, Zhangzhou Medical Vocational College, Zhangzhou 363000, China;1School of Life Sciences, Xiamen University, Xiamen 361005, China
Abstract: Three megaspores of a tetrad of tobacco will degenerate after meiosis of megaspore mother cell and only chalazal-most one develops. In meiosis I， more organelles of the megaspore mother cell move toward the micropylar end and while fewer toward the chalazal end. After meiosis， a tetrad of four megaspores is formed. Then the two micropylar megaspores， which come from the micropylar cell of the dyad， degenerate first. Afterwards， the third megaspore， which comes from the chalazal cell of the dyad， begins to degenerate， suggesting a temporal and spatial degenerative difference with the former two.
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