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Anthophyta (angiosperms)-megasporogenesis

Flower and Flower parts; microsporogenesis, megasporogenesis, fruits

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megasore mother cell division of megaspore, nucellus, integuments 1^st four nucleate state, after two mitotic divisions of the functional megaspore

above: three nuclei migrating towards end of embryo sac away from micropyle fusion has taken place and another mitosis has occurred; thus have 2 3-N nuclei and 2- N nuclei at micropylar end mitotic division of the 2-3N nuclei (at top of embryo sac) and 2-N nuclei (at bottom of embryo sac).

two illustrations to the left show the 8-nucleate stage of the mature embryo sac; 3 antipodal nuclei (all 3N), 2 polar nuclei (one 3N and one N), 2 synergids (all N) and one egg (N). nucellus, micropyle, micropylar chamber, integuments

l-s through ovary and ovules; left fruit with pericarp,stigma,syle, ovules attached to placenta by funiculus, cotyledons (two), epicotyl, hypocoty, endosperm, seed coat, area where the synergids; remaining illustrations show magnified views of similar structures.


megasore mother cell	division of megaspore, nucellus, integuments	1^st four nucleate state, after two mitotic divisions of the functional megaspore

above: three nuclei migrating towards end of embryo sac away from micropyle	fusion has taken place and another mitosis has occurred; thus have 2 3-N nuclei and 2- N nuclei at micropylar end	mitotic division of the 2-3N nuclei (at top of embryo sac) and 2-N nuclei (at bottom of embryo sac).
		two illustrations to the left show the 8-nucleate stage of the mature embryo sac; 3 antipodal nuclei (all 3N), 2 polar nuclei (one 3N and one N), 2 synergids (all N) and one egg (N). nucellus, micropyle, micropylar chamber, integuments