macrosporogenesis

macrosporogenesis

[¦mak·rō¦spȯr·ō′jen·ə·səs]
(botany)
In angiosperms, the formation of macrospores and the production of the embryo sac from one or occasionally several cells of the subepidermal cell layer within the ovule of a closed ovary. Also known as megasporogenesis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Majority of the identified genes were associated with metabolic activities and wall assembly required for the specialized process of pollen maturation and pollination, while few showed predominance or specificity in macrosporogenesis. On one hand, this could be attributed to the fact that much more ESTs from libraries made with anthers were used in the analysis, which had limitation of development stage and tissue-type coverage; on the other hand, it was probably due to the specific structure of pollen grains whose formation requires expression of a specific set of genes or gene network that made the related genes easily recognized through the differential analysis.
The act of fertilization in orchid ovaries is a delayed process in most species studied because the flower bud opens and its stigma is receptive to pollination before macrosporogenesis is completed.