Macrosporogenesis and embryo-sac development in Euchlaena mexicana and Zea mays

Cooper, D.C.

Journal of Agricultural Research (Washington, D.C.) 55(7): 539-551


ISSN/ISBN: 0095-9758
Accession: 013420502

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Ovule development, macrosporogenesis and the formation of the macrogameto-phyte are essentially similar in the annual var. of Florida teosinte, yellow dent corn and the corn-teosinte hybrid. Each ovule contains a single archesporial cell which functions as the macrospore mother cell. In consequence of the 2 meiotic divisions, a row of 4 macrospores is produced of which the chalazal one becomes the embryo-sac mother cell, the others disintegrate. Cell plates are formed across the telophase spindles of the 2d nuclear division producing a 3-nucleate embryo sac. A 3d nuclear division followed by cell plate formation leads to a typical 8-nucleate, 7-celled structure. The antipodal cells continue to divide so that 30 to 40 such cells are present at maturity. Fertilization occurs in teosinte between 15 and 20 hrs. after pollination. The ovule is amphianatropous in form at this time. The synergids persist for 4 or 5 days after fertilization, and then disintegrate.