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Botanical Sciences
versión On-line ISSN 2007-4476versión impresa ISSN 2007-4298
Resumen
CASTREJON-VARELA, Alejandra et al. Morphogenesis of gametophytes of four Mexican species of the family Thelypteridaceae. Bot. sci [online]. 2020, vol.98, n.3, pp.533-544. Epub 17-Feb-2021. ISSN 2007-4476. https://doi.org/10.17129/botsci.2520.
Background:
Although there have been studies on the sexual phase of some species of Thelypteridaceae, none have included germination types and prothallial development.
Question:
Is there variation in the type of germination and prothallial development in the gametophytes of four species in the family Thelypteridaceae?
Study species:
Four species of the family Thelypteridaceae: Meniscium falcatum, Goniopteris mollis, Goniopteris liebmannii, and Goniopteris minor of the states of Chiapas, Oaxaca, and Tabasco.
Methods:
Spores were collected, sown in Petri dishes with Thompson culture medium, stored in transparent plastic bags, and placed in a plant growth chamber. The various stages of gametophyte development were fixed in FAA with 0.8 % sucrose, dehydrated in gradual alcohols, critical point dried, mounted on stubs, and coated with gold. The photomicrographs were obtained using a scanning electron microscope (SEM) Model Jeol JSM5310-LV.
Results:
The spores are monolete and perinate. Germination is of the Vittaria type, and prothallial development of the Aspidium type. Adult gametophytes are cordiform-spatulate, with numerous glandular, simple and single-celled hairs, antheridia and archegonia are of the leptosporangiate type. The first sporophyte leaf is bi or trilobate, with free dichotomous venation, with capitate-glandular hairs, simple, unicellular and acicular hairs, and hypostomatic polycytic stomata.
Conclusions:
The differences observed among the studied species are: spore size, perispore ornamentation, germination and emergence timing of the rhizoids, type and size of hairs, and development time of gametangia and sporophytes.
Palabras llave : Ferns; Goniopteris; life cycles; morphology; Meniscium; phase sexual; SEM; Thelypteridoideae.