单词 | megasporogenesis |
释义 | megasporogenesis[ meg-uh-spawr-uh-jen-uh-sis, -spohr- ] / ˌmɛg əˌspɔr əˈdʒɛn ə sɪs, -ˈspoʊr- / noun Botany.the formation and development of megaspores. Words nearby megasporogenesismegascopic, megasporangium, megaspore, megaspore mother cell, megasporocyte, megasporogenesis, megasporophyll, megass, megastar, megastructure, megathere Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for megasporogenesismegasporogenesis [ mĕg′ə-spôr′ə-jĕn′ĭ-sĭs ] The formation of megaspores inside the ovules of seed plants. A diploid cell in the ovule, called a megasporocyte or a megaspore mother cell, undergoes meiosis and gives rise to four haploid megaspores. In most plants, only one of the megaspores then goes on to develop into a megagametophyte within the ovule, while the other three disintegrate. In the ovules of angiosperms, megasporogenesis takes place within a structure called a nucellus, and it is the megaspore farthest from the micropyle of the ovary that survives. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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