Anatomical Features of the Tubercle and Young Sporophyte of the Annual Fern <i>Anogramma chaerophylla</i> Growing in the Punta Lara Natural Reserve (Buenos Aires, Argentina)

The fern genus Anogramma is characterized by the presence of annual sporophytes and tubercles that persist through dry periods. Tubercles may host embryos that develop when climatic conditions are more favorable. As information on the structure of the tubercle and sporophyte of Anogramma chaerophyll...

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Detalles Bibliográficos
Autores principales:	Luna, María Luján, Ramos Giacosa, Juan Pablo, Yañez, Agustina, Giudice, Gabriela Elena
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2017
Materias:	Ciencias Naturales Gametophyte Anatomy Anogramma Adaptations Embryo
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/103382 http://www.bioone.org/doi/full/10.1640/0002-8444-106.4.231
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-103382
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Naturales Gametophyte Anatomy Anogramma Adaptations Embryo
spellingShingle	Ciencias Naturales Gametophyte Anatomy Anogramma Adaptations Embryo Luna, María Luján Ramos Giacosa, Juan Pablo Yañez, Agustina Giudice, Gabriela Elena Anatomical Features of the Tubercle and Young Sporophyte of the Annual Fern <i>Anogramma chaerophylla</i> Growing in the Punta Lara Natural Reserve (Buenos Aires, Argentina)
topic_facet	Ciencias Naturales Gametophyte Anatomy Anogramma Adaptations Embryo
description	The fern genus Anogramma is characterized by the presence of annual sporophytes and tubercles that persist through dry periods. Tubercles may host embryos that develop when climatic conditions are more favorable. As information on the structure of the tubercle and sporophyte of Anogramma chaerophylla is incomplete, the objective of this work was to analyze anatomical characteristics during development and deepen knowledge of the adaptive strategies of this species. Spores were grown in-vitro and different stages of tubercle development and embryonic sporophytes were fixed in FAA, embedded in Paraplast and analyzed using light microscopy. Initially, the green gametophyte developed antheridia and archegonia in its thickened portion, where later bisexual tubercles differentiated. Embryos developed only from the archegonia located in the tubercles, with one embryo developing per tubercule. During sporophyte growth the reserves accumulated in the tubercle were consumed. Oversized cells were observed at the junction between the green gametophyte and the tubercle, suggesting a possible role in translocation of substances. The young sporophyte consisted of a short shoot and a prominent foot. The placenta comprised the foot cells and the adjacent tubercle cells. The first leaves protruded soon and developed early as photosynthetic organs. Sporophytes remained attached to the tubercles until advanced stages of development. Vegetative propagation was documented in smaller tubercles that did not develop gametangia. Because few sporophytes were observed in vivo, it is likely that natural populations are maintained through vegetative propagation of the gametophyte until favorable conditions encourage development of sporophytes.
format	Articulo Articulo
author	Luna, María Luján Ramos Giacosa, Juan Pablo Yañez, Agustina Giudice, Gabriela Elena
author_facet	Luna, María Luján Ramos Giacosa, Juan Pablo Yañez, Agustina Giudice, Gabriela Elena
author_sort	Luna, María Luján
title	Anatomical Features of the Tubercle and Young Sporophyte of the Annual Fern <i>Anogramma chaerophylla</i> Growing in the Punta Lara Natural Reserve (Buenos Aires, Argentina)
title_short	Anatomical Features of the Tubercle and Young Sporophyte of the Annual Fern <i>Anogramma chaerophylla</i> Growing in the Punta Lara Natural Reserve (Buenos Aires, Argentina)
title_full	Anatomical Features of the Tubercle and Young Sporophyte of the Annual Fern <i>Anogramma chaerophylla</i> Growing in the Punta Lara Natural Reserve (Buenos Aires, Argentina)
title_fullStr	Anatomical Features of the Tubercle and Young Sporophyte of the Annual Fern <i>Anogramma chaerophylla</i> Growing in the Punta Lara Natural Reserve (Buenos Aires, Argentina)
title_full_unstemmed	Anatomical Features of the Tubercle and Young Sporophyte of the Annual Fern <i>Anogramma chaerophylla</i> Growing in the Punta Lara Natural Reserve (Buenos Aires, Argentina)
title_sort	anatomical features of the tubercle and young sporophyte of the annual fern <i>anogramma chaerophylla</i> growing in the punta lara natural reserve (buenos aires, argentina)
publishDate	2017
url	http://sedici.unlp.edu.ar/handle/10915/103382 http://www.bioone.org/doi/full/10.1640/0002-8444-106.4.231
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Anatomical Features of the Tubercle and Young Sporophyte of the Annual Fern <i>Anogramma chaerophylla</i> Growing in the Punta Lara Natural Reserve (Buenos Aires, Argentina)

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