Gametophytic phase of three taxa of Anemia (Anemiaceae)

Acta Botanica Mexicana

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Title Gametophytic phase of three taxa of Anemia (Anemiaceae)
Fase gametofítica de tres taxones de Anemia (Anemiaceae)
 
Creator Chambi, Cristina Janet
Martínez, Olga Gladys
 
Subject esporas
gametofitos
germinación
helechos
tricomas
ferns
gametophytes
germination
spores
trichomes
 
Description Background and Aims: Anemiaceae has a single genus, Anemia, with 115 species distributed in the Neotropics, Africa, India, and islands in the Indian Ocean. The aim of this work is characterize living spores and gametophytic phase of three Anemia taxa from South America, little studied or with fragmentary studies, A. herzogii, A. tomentosa var. anthriscifolia and A. tomentosa var. tomentosa.Methods: Gametophytes of the three taxa have been obtained through in vitro cultures of spores. The spores and gametophytes were studied with light and scanning electron microscopes. The germination pattern of the spores, the evolution of the gametophytic development and the sexual expression were described.Key results: Filamentous gametophytes were formed by 4-20 cells, the adults were cordate, symmetrical or asymmetrical, bisexual and protandric, on their surfaces and margins clavate trichomes were observed. Gametangia corresponded to the leptosporangiate type. The dehiscence of antheridia was produced by a perforation in the opercular cell. Archegonia had necks with four to seven cells and four triangular cells at the distal end of the neck. Anemia herzogii showed branched trichomes on the gametophytes and later developed sporophytes.Conclusions: Germination in all taxa corresponds to the Anemia-type and the gametophytic development to the Ceratopteris-type. Anemia herzogii is distinguished from the two varieties by the presence of branched trichomes exclusive of the gametophytic phase. The studied taxa are characterized by the morphology of gametophyte, type of trichomes and sexuality.
Antecedentes y Objetivos: Anemiaceae presenta un único género, Anemia, con 115 especies que se distribuyen en el Neotrópico, África, India e islas en el Océano Índico. El objetivo de este trabajo es caracterizar las esporas vivas y la fase gametofítica de tres taxones de Anemia sudamericanas, poco estudiadas o con estudios fragmentados, A. herzogii, A. tomentosa var. anthriscifolia y A. tomentosa var. tomentosa.Métodos: Los gametofitos de los tres taxones han sido obtenidos a través de cultivos in vitro de las esporas. Las esporas y los gametofitos fueron estudiados a través del microscopio de luz y electrónico de barrido. Se describió el patrón de germinación de las esporas, evolución del desarrollo gametofítico y expresión sexual.Resultados clave: Los gametofitos filamentosos estaban formados por 4-20 células, los adultos fueron cordados simétricos o asimétricos, bisexuales y protándricos, en sus superficies y márgenes se observaron tricomas clavados. Los gametangios corresponden al tipo leptosporangiado. La dehiscencia de los anteridios se produjo mediante una perforación en la célula opercular. Los arquegonios tenían cuellos con cuatro a siete células y cuatro células triangulares en el extremo distal del cuello. Anemia herzogii mostró tricomas ramificados sobre los gametofitos y más tarde desarrolló esporofitos.Conclusiones: La germinación en todos los taxones corresponde al tipo Anemia y el desarrollo gametofítico al tipo Ceratopteris. Anemia herzogii se distingue de las dos variedades por la presencia de tricomas ramificados exclusivos de la fase gametofítica. Los taxones estudiados se caracterizan por la morfología del gametofito, tipo de tricomas y sexualidad.
 
Publisher Instituto de Ecología, A.C.
 
Date 2020-07-09
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
artículo evaluado por pares
 
Format application/pdf
application/epub+zip
image/jpeg
image/jpeg
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application/vnd.openxmlformats-officedocument.wordprocessingml.document
image/jpeg
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application/vnd.openxmlformats-officedocument.wordprocessingml.document
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Identifier https://abm.ojs.inecol.mx/index.php/abm/article/view/1631
10.21829/abm127.2020.1631
 
Source Acta Botanica Mexicana; No. 127 (2020)
Acta Botanica Mexicana; Núm. 127 (2020)
2448-7589
0187-7151
 
Language spa
 
Relation https://abm.ojs.inecol.mx/index.php/abm/article/view/1631/pdf
https://abm.ojs.inecol.mx/index.php/abm/article/view/1631/epub
https://abm.ojs.inecol.mx/index.php/abm/article/view/1631/3335
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https://abm.ojs.inecol.mx/index.php/abm/article/view/1631/3346
 
Rights Derechos de autor 2020 Acta Botanica Mexicana
https://creativecommons.org/licenses/by-nc/4.0
 

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