POSICION TAXONOMICA, CITOLOGIA Y PALINOLOGIA DE TRES NIVELES DE PLOIDIA DE TURNERA SUBULATA SMITH

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Turnera subulata Sm. lives in America, from Panamá to Bolivia. It was introduced to Asia, where it is nowadays a common weed in India, Malasia and Indonesia. Plant and pollen morphology, and citology were studied in one diploid (2n=2x=20) accessions of Turnera subulata from Brasil. One triploid hybr...

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Autores principales: ARBO, MARIA M., FERNANDEZ, AVELIANO
Formato: Artículo revista
Lenguaje:Español
Publicado: Instituto de Botánica del Nordeste 1981
Acceso en línea:https://revistas.unne.edu.ar/index.php/bon/article/view/8292
Aporte de:
Revistas UNNE - Universidad Nacional del Noroeste (UNNE) de Universidad Nacional del Nordeste
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institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-154
container_title_str Revistas UNNE - Universidad Nacional del Noroeste (UNNE)
language Español
format Artículo revista
author ARBO, MARIA M.
FERNANDEZ, AVELIANO
spellingShingle ARBO, MARIA M.
FERNANDEZ, AVELIANO
POSICION TAXONOMICA, CITOLOGIA Y PALINOLOGIA DE TRES NIVELES DE PLOIDIA DE TURNERA SUBULATA SMITH
author_facet ARBO, MARIA M.
FERNANDEZ, AVELIANO
author_sort ARBO, MARIA M.
title POSICION TAXONOMICA, CITOLOGIA Y PALINOLOGIA DE TRES NIVELES DE PLOIDIA DE TURNERA SUBULATA SMITH
title_short POSICION TAXONOMICA, CITOLOGIA Y PALINOLOGIA DE TRES NIVELES DE PLOIDIA DE TURNERA SUBULATA SMITH
title_full POSICION TAXONOMICA, CITOLOGIA Y PALINOLOGIA DE TRES NIVELES DE PLOIDIA DE TURNERA SUBULATA SMITH
title_fullStr POSICION TAXONOMICA, CITOLOGIA Y PALINOLOGIA DE TRES NIVELES DE PLOIDIA DE TURNERA SUBULATA SMITH
title_full_unstemmed POSICION TAXONOMICA, CITOLOGIA Y PALINOLOGIA DE TRES NIVELES DE PLOIDIA DE TURNERA SUBULATA SMITH
title_sort posicion taxonomica, citologia y palinologia de tres niveles de ploidia de turnera subulata smith
description Turnera subulata Sm. lives in America, from Panamá to Bolivia. It was introduced to Asia, where it is nowadays a common weed in India, Malasia and Indonesia. Plant and pollen morphology, and citology were studied in one diploid (2n=2x=20) accessions of Turnera subulata from Brasil. One triploid hybrid (2n=15) was obtained by espontaneous Crossing of one tetraploid and the diploid strain. In the literature there are counts of four accessions from Brasil, one from India and one from Malasia, all tetraploids (2n=20). subulata is considered a different species of T. ulmifolia be: cause it presents a certain combination of morphological characters, constant in all three ploidy levels. Pollen sculpture is dimorphic, unlike other distylous taxa: short styled flowers have reticulate grains, with broad meshes and m any free bacules within; long styled flowers have small reticulate grains, with little meshes without free bacules. Pollen fertility is 96—99%in the diploid, 86—89% in the tetraploids and 48% in the triploid. Meiotic chromosome behavior was regular in the diploid acces- sion with 5 bivalents in every pollen mother cell (PMC). Meiosis was also studied in two tetraploid accessions, which showed a high level of quadrivalent chromosome associations. The máximum of five qua- drivalents was observed in 15 and 35 percent of the PMC respectively. Three different chromosome configurations were observed in the tri­ploid hybrid at metaphase I: 5 III in 29,5% of the PMC’ s, 4 III + 1 II + 1 I in 45,9%, and 3 III + 2 II +21 in 24,5%. These findings sug- gest that the 2n=20 cytotypes are autotetraploids. Tumera subulata 2n=10 and its autotetraploid derivates 2n = 20 constitute only one species beeause there is genetic continüity among them.  
publisher Instituto de Botánica del Nordeste
publishDate 1981
url https://revistas.unne.edu.ar/index.php/bon/article/view/8292
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AT fernandezaveliano posiciontaxonomicacitologiaypalinologiadetresnivelesdeploidiadeturnerasubulatasmith
first_indexed 2025-06-17T05:00:46Z
last_indexed 2025-06-17T05:00:46Z
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spelling I48-R154-article-82922025-05-29T23:04:59Z POSICION TAXONOMICA, CITOLOGIA Y PALINOLOGIA DE TRES NIVELES DE PLOIDIA DE TURNERA SUBULATA SMITH ARBO, MARIA M. FERNANDEZ, AVELIANO Turnera subulata Sm. lives in America, from Panamá to Bolivia. It was introduced to Asia, where it is nowadays a common weed in India, Malasia and Indonesia. Plant and pollen morphology, and citology were studied in one diploid (2n=2x=20) accessions of Turnera subulata from Brasil. One triploid hybrid (2n=15) was obtained by espontaneous Crossing of one tetraploid and the diploid strain. In the literature there are counts of four accessions from Brasil, one from India and one from Malasia, all tetraploids (2n=20). subulata is considered a different species of T. ulmifolia be: cause it presents a certain combination of morphological characters, constant in all three ploidy levels. Pollen sculpture is dimorphic, unlike other distylous taxa: short styled flowers have reticulate grains, with broad meshes and m any free bacules within; long styled flowers have small reticulate grains, with little meshes without free bacules. Pollen fertility is 96—99%in the diploid, 86—89% in the tetraploids and 48% in the triploid. Meiotic chromosome behavior was regular in the diploid acces- sion with 5 bivalents in every pollen mother cell (PMC). Meiosis was also studied in two tetraploid accessions, which showed a high level of quadrivalent chromosome associations. The máximum of five qua- drivalents was observed in 15 and 35 percent of the PMC respectively. Three different chromosome configurations were observed in the tri­ploid hybrid at metaphase I: 5 III in 29,5% of the PMC’ s, 4 III + 1 II + 1 I in 45,9%, and 3 III + 2 II +21 in 24,5%. These findings sug- gest that the 2n=20 cytotypes are autotetraploids. Tumera subulata 2n=10 and its autotetraploid derivates 2n = 20 constitute only one species beeause there is genetic continüity among them.   Turnera subulata Sm. lives in America, from Panamá to Bolivia. It was introduced to Asia, where it is nowadays a common weed in India, Malasia and Indonesia. Plant and pollen morphology, and citology were studied in one diploid (2n=2x=20) accessions of Turnera subulata from Brasil. One triploid hybrid (2n=15) was obtained by espontaneous Crossing of one tetraploid and the diploid strain. In the literature there are counts of four accessions from Brasil, one from India and one from Malasia, all tetraploids (2n=20). subulata is considered a different species of T. ulmifolia be: cause it presents a certain combination of morphological characters, constant in all three ploidy levels. Pollen sculpture is dimorphic, unlike other distylous taxa: short styled flowers have reticulate grains, with broad meshes and m any free bacules within; long styled flowers have small reticulate grains, with little meshes without free bacules. Pollen fertility is 96—99%in the diploid, 86—89% in the tetraploids and 48% in the triploid. Meiotic chromosome behavior was regular in the diploid acces- sion with 5 bivalents in every pollen mother cell (PMC). Meiosis was also studied in two tetraploid accessions, which showed a high level of quadrivalent chromosome associations. The máximum of five qua- drivalents was observed in 15 and 35 percent of the PMC respectively. Three different chromosome configurations were observed in the tri­ploid hybrid at metaphase I: 5 III in 29,5% of the PMC’ s, 4 III + 1 II + 1 I in 45,9%, and 3 III + 2 II +21 in 24,5%. These findings sug- gest that the 2n=20 cytotypes are autotetraploids. Tumera subulata 2n=10 and its autotetraploid derivates 2n = 20 constitute only one species beeause there is genetic continüity among them.   Instituto de Botánica del Nordeste 1981-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unne.edu.ar/index.php/bon/article/view/8292 10.30972/bon.521-298292 Bonplandia; Vol. 5 No. 21-29 (1981); 211-226 Bonplandia; Vol. 5 Núm. 21-29 (1981); 211-226 1853-8460 0524-0476 spa https://revistas.unne.edu.ar/index.php/bon/article/view/8292/7849 Derechos de autor 2025 Bonplandia http://creativecommons.org/licenses/by/4.0

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