ibclogo XVI International Botanical Congess


Abstract Number: 5063
Poster No. = 1607


APOGAMY IN DRYOPTERIS MUNCHII (DRYOPTERIDACEAE), ENDEMIC SPECIES OF CHIAPAS, MEXICO


B. Pérez-Garcia, A. Mendoza, I. Reyes & R. Riba. Universidad Autónoma Metropolitana. Ap. Postal 55-535. México, D.F. 09340


The development of the sexual phase of Dryopteris munchii A.R. Smith and the origin and early development of apogamic embryos is described in this paper. The spores were sown in vitro in petri dishes with agar/Thompson medium, the cultures were maintained in the laboratory under 12 h light/12 h darkness, 23?-28?C. The germination of the spores was Vittaria-type and the prothallic development was Aspidium-type. The adult prothallia were cordiform with a deep meristematic notch. About two months after the sowing of the spores, there were not archegonia in any of the prothallia and began the differentiation of apogamic sporophytes below the north in some of them. Later on, smaller prothallia with antheridia were found in some of the cultures. Apogamy in species of Dryopteris is known since 1878 and this is the first report of this process for Dryopteris munchii.


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