Embryo sac development in Vanroyenella plumosa, Podostemaceae
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770; e-ISSN 1879-1522, meer
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Developmental stages > Embryos
Flora > Aquatic organisms > Aquatic plants
Flora > Weeds
Flora > Weeds > Freshwater organisms > Freshwater weeds
Mexico
Podostemoideae; Vanroyenella plumosa
Mexico [Marine Regions]
Zoet water |
| Auteurs | | Top |
- Murguía-Sánchez, G.
- Novelo, R.A.
- Philbrick, C.T.
- Márquez-Guzmán, G.J.
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| Abstract |
Species of Podostemaceae grow in rapidly flowing tropical rivers, streams and water falls, strongly attached to rock substrates via expanded, adhesive-secreting holdfasts (haptera). Vanroyenella is a monotypic genus endemic to Mexico, occurring in the northern extent of the tropical distribution of Podostemaceae in the New World. Embryo sac development and nucellar plasmodium formation of Vanroyenella plumosa Novelo and Philbrick was studied. The numerous ovules are anatropous, bitegmic, exostomous, and tenuinucellate, each with a four-celled monosporic embryo sac of the Apinagia type. Disintegration of the nucellus into a plasmodium takes place prior to fertilization. Embryo sac development of Vanroyenella is similar to other members of the Podostemoideae subfamily. |
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