Salient ovule features of Zamia furfuracea L. fil.: Early stages of megagametophytogenesis

•This is the first detailed description of megagametophyte development in Zamia. This process has only been seen in one other cycad genus, Dioon. The anatomy of the megagametophyte of Zamia furfuracea, a cycad species with a short reproductive cycle, is described in the first stages of its ontogeny...

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Bibliographic Details
Published in:Flora. Morphologie, Geobotanik, Oekophysiologie Geobotanik, Oekophysiologie, 2022-11, Vol.296, p.152168, Article 152168
Main Authors: Ydelia Sánchez-Tinoco, M., Stevenson, Dennis Wm, Vovides, Andrew P., Alejandro, Alonso López, Hernández-Zárate, Galdy, Iglesias-Andreu, Lourdes G., Moya, Edmundo García
Format: Article
Language:English
Subjects:
Alveoli
Cycadales
Free nuclei
Megagametophyte
Ovule
Zamia
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Summary:•This is the first detailed description of megagametophyte development in Zamia. This process has only been seen in one other cycad genus, Dioon. The anatomy of the megagametophyte of Zamia furfuracea, a cycad species with a short reproductive cycle, is described in the first stages of its ontogeny corresponding to the free nuclear and alveolation stages. The way in which the free nuclei are arranged centripetally to later organize themselves into a series of radially elongated hexahedral and short pyramidal trihedral or tetrahedral alveoli, forming rays that converge in the center of the megagametophyte, is noteworthy. In cross section, the hexagon-shaped alveoli together give the megagametophyte the appearance of a honeycomb. A three-layered jacket of transfer cells with dense cytoplasm and prominent nuclei is clearly recognizable and its anatomy is associated with nutrient translation that is compared to a tapetum like jacket. These two stages are continuous and occur within an interval of one week in the summer.
ISSN:0367-2530
1618-0585
DOI:10.1016/j.flora.2022.152168