New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia

A new chromosome count on Blechnum hastatum, together with the study of the ontogeny and development of the leptosporangia of this taxon, and of B. occidentale is carried out here. Adult leptosporangia of other taxa of the genus Blechnum, such as those of B. australe subsp. auriculatum, B. glandulos...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autor principal:	González, Graciela Esther
Publicado:	2010
Materias:	Blechnum Chromosome numbers Leptosporangium development Number of cells of the annulus Systematic Blechnaceae Blechnum glandulosum Blechnum hastatum Blechnum occidentale Pteridophyta
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00165301_v67_n1_p52_Gonzalez http://hdl.handle.net/20.500.12110/paper_00165301_v67_n1_p52_Gonzalez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00165301_v67_n1_p52_Gonzalez
record_format	dspace
spelling	paper:paper_00165301_v67_n1_p52_Gonzalez2023-06-08T14:38:15Z New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia González, Graciela Esther Blechnum Chromosome numbers Leptosporangium development Number of cells of the annulus Systematic Blechnaceae Blechnum Blechnum glandulosum Blechnum hastatum Blechnum occidentale Pteridophyta A new chromosome count on Blechnum hastatum, together with the study of the ontogeny and development of the leptosporangia of this taxon, and of B. occidentale is carried out here. Adult leptosporangia of other taxa of the genus Blechnum, such as those of B. australe subsp. auriculatum, B. glandulosum and B. mochaenum subsp. mochaenum are also compared. In relation with the cytology of B. hastatum, 33 bivalents at diakinesis were counted, indicating that it is a diploid with a chromosome number 2n=66, which coincides with a previous count, and also places the taxon in the sequence of basic chromosome numbers known for the genus, ie x=33, which seems to be the most frequent. The ontogeny of the leptosporangia was studied for the first time in B. hastatum and B. occidentale. The sporangia initiate from a single initial epidermal cell, which may belong to the commissural area or to the indusia; they develop a long pedicel with three rows of long or short cells, short cells being the most common condition found in B. hastatum, while long cells were seen in B. occidentale. The pedicels are at their maximum length before the capsule ripens. The stomium usually bears no more than 6-8 cells in all species, with a labiate aperture. The capsules have an indurated vertical annulus, that reach the base of the capsule, and have up to 14 cells in B. australe subsp. auriculatum and B. glandulosum, up to 18 in B. hastatum and up to 21 in B. mochaenum subsp. mochaenum and B. occidentale; the number of indurate cells may be a new useful diagnostic trait in the genus. Fil:González, G.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00165301_v67_n1_p52_Gonzalez http://hdl.handle.net/20.500.12110/paper_00165301_v67_n1_p52_Gonzalez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Blechnum Chromosome numbers Leptosporangium development Number of cells of the annulus Systematic Blechnaceae Blechnum Blechnum glandulosum Blechnum hastatum Blechnum occidentale Pteridophyta
spellingShingle	Blechnum Chromosome numbers Leptosporangium development Number of cells of the annulus Systematic Blechnaceae Blechnum Blechnum glandulosum Blechnum hastatum Blechnum occidentale Pteridophyta González, Graciela Esther New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia
topic_facet	Blechnum Chromosome numbers Leptosporangium development Number of cells of the annulus Systematic Blechnaceae Blechnum Blechnum glandulosum Blechnum hastatum Blechnum occidentale Pteridophyta
description	A new chromosome count on Blechnum hastatum, together with the study of the ontogeny and development of the leptosporangia of this taxon, and of B. occidentale is carried out here. Adult leptosporangia of other taxa of the genus Blechnum, such as those of B. australe subsp. auriculatum, B. glandulosum and B. mochaenum subsp. mochaenum are also compared. In relation with the cytology of B. hastatum, 33 bivalents at diakinesis were counted, indicating that it is a diploid with a chromosome number 2n=66, which coincides with a previous count, and also places the taxon in the sequence of basic chromosome numbers known for the genus, ie x=33, which seems to be the most frequent. The ontogeny of the leptosporangia was studied for the first time in B. hastatum and B. occidentale. The sporangia initiate from a single initial epidermal cell, which may belong to the commissural area or to the indusia; they develop a long pedicel with three rows of long or short cells, short cells being the most common condition found in B. hastatum, while long cells were seen in B. occidentale. The pedicels are at their maximum length before the capsule ripens. The stomium usually bears no more than 6-8 cells in all species, with a labiate aperture. The capsules have an indurated vertical annulus, that reach the base of the capsule, and have up to 14 cells in B. australe subsp. auriculatum and B. glandulosum, up to 18 in B. hastatum and up to 21 in B. mochaenum subsp. mochaenum and B. occidentale; the number of indurate cells may be a new useful diagnostic trait in the genus.
author	González, Graciela Esther
author_facet	González, Graciela Esther
author_sort	González, Graciela Esther
title	New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia
title_short	New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia
title_full	New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia
title_fullStr	New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia
title_full_unstemmed	New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia
title_sort	new chromosome count for blechnum hastatum (blechnaceae-pteridophyta), with a study of the ontogeny and types of adult leptosporangia
publishDate	2010
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00165301_v67_n1_p52_Gonzalez http://hdl.handle.net/20.500.12110/paper_00165301_v67_n1_p52_Gonzalez
work_keys_str_mv	AT gonzalezgracielaesther newchromosomecountforblechnumhastatumblechnaceaepteridophytawithastudyoftheontogenyandtypesofadultleptosporangia
_version_	1768542969740132352

New chromosome count for Blechnum hastatum (Blechnaceae-Pteridophyta), with a study of the ontogeny and types of adult leptosporangia

Ejemplares similares