Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)

Chromosome numbers and karyotypes of seven specific taxa of the Chilean endemic genus Placea were determined. Chromosome numbers of P. lutea, P. ornata, P grandiflora, P germainii andP. aff davidii are described for the first time. All taxa are diploid with 2«=2x=16 and karyotypes are composed of fo...

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Autores principales:	Cisternas,Mauricio A, Araneda,Loreto, García,Nicolás, Baeza,Carlos M
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2010
Materias:	Chile endemic flora Hippeastreae karyology
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200005
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id	oai:scielo:S0717-66432010000200005
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spelling	oai:scielo:S0717-664320100002000052011-02-04Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)Cisternas,Mauricio AAraneda,LoretoGarcía,NicolásBaeza,Carlos M Chile endemic flora Hippeastreae karyology Chromosome numbers and karyotypes of seven specific taxa of the Chilean endemic genus Placea were determined. Chromosome numbers of P. lutea, P. ornata, P grandiflora, P germainii andP. aff davidii are described for the first time. All taxa are diploid with 2«=2x=16 and karyotypes are composed of four metacentric (4 m), ten submetacentric (10 sm), and two subtelocentric (2 st) chromosomes. The most symmetrical karyotype was observed in P. lutea (AI: 6.84) while the most asymmetrical karyotype was shown by P. arzae (AI: 9.72). The constancy in karyotype formulae and high similarity in asymmetry indexes suggest that some orthoselection mechanism might be involved in Placea's chromosomal evolution. In spite that no significant karyotypic differences were observed, the species may be differentiated by their chromosomal sizes. Moreover, the tribal position of Placea and its likely relationships with other hippeastroid genera are discussed.info:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana. Botánica v.67 n.2 20102010-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200005en10.4067/S0717-66432010000200005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chile endemic flora Hippeastreae karyology
spellingShingle	Chile endemic flora Hippeastreae karyology Cisternas,Mauricio A Araneda,Loreto García,Nicolás Baeza,Carlos M Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)
description	Chromosome numbers and karyotypes of seven specific taxa of the Chilean endemic genus Placea were determined. Chromosome numbers of P. lutea, P. ornata, P grandiflora, P germainii andP. aff davidii are described for the first time. All taxa are diploid with 2«=2x=16 and karyotypes are composed of four metacentric (4 m), ten submetacentric (10 sm), and two subtelocentric (2 st) chromosomes. The most symmetrical karyotype was observed in P. lutea (AI: 6.84) while the most asymmetrical karyotype was shown by P. arzae (AI: 9.72). The constancy in karyotype formulae and high similarity in asymmetry indexes suggest that some orthoselection mechanism might be involved in Placea's chromosomal evolution. In spite that no significant karyotypic differences were observed, the species may be differentiated by their chromosomal sizes. Moreover, the tribal position of Placea and its likely relationships with other hippeastroid genera are discussed.
author	Cisternas,Mauricio A Araneda,Loreto García,Nicolás Baeza,Carlos M
author_facet	Cisternas,Mauricio A Araneda,Loreto García,Nicolás Baeza,Carlos M
author_sort	Cisternas,Mauricio A
title	Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)
title_short	Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)
title_full	Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)
title_fullStr	Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)
title_full_unstemmed	Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)
title_sort	karyotypic studies in the chilean genus placea (amaryllidaceae)
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200005
work_keys_str_mv	AT cisternasmauricioa karyotypicstudiesinthechileangenusplaceaamaryllidaceae AT aranedaloreto karyotypicstudiesinthechileangenusplaceaamaryllidaceae AT garcianicolas karyotypicstudiesinthechileangenusplaceaamaryllidaceae AT baezacarlosm karyotypicstudiesinthechileangenusplaceaamaryllidaceae
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Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)

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