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Search Results: 1 - 10 of 694 matches for " JARA-SEGUEL "
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Cytogenetics of Chilean angiosperms: Advances and prospects
JARA-SEGUEL,PEDRO; URRUTIA,JONATHAN;
Revista chilena de historia natural , 2012, DOI: 10.4067/S0716-078X2012000100001
Abstract: cytogenetic data on chilean angiosperms have been reported since at least eight decades ago; however, much of this information is disperse in diverse sources and is not readily available as a comprehensive document that allows having a general vision on advances and gaps in this matter. the goal of this paper is to summarize the advances and prospets on cytogenetic studies of the chilean angiosperms based on compiled publications from 1929 to 2010. we found 78 publications supplied by four groups of chilean researchers and some foreign specialists. cytogenetic data have been reported for 139 chilean angiosperm species (2.8 % of the total), which belong to 58 genera and 34 families. during 2001-2010 there was an increase in the number of publications, being available 40 reports including 95 additional species. based on these data, we hope that such a trend can be maintained in the next decade if the current research groups and young specialists continue to be interested in the study of native plants.
Cytogenetics of Chilean angiosperms: Advances and prospects Citogenética de angiospermas chilenas: Avances y proyecciones
PEDRO JARA-SEGUEL,JONATHAN URRUTIA
Revista chilena de historia natural , 2012,
Abstract: Cytogenetic data on Chilean angiosperms have been reported since at least eight decades ago; however, much of this information is disperse in diverse sources and is not readily available as a comprehensive document that allows having a general vision on advances and gaps in this matter. The goal of this paper is to summarize the advances and prospets on cytogenetic studies of the Chilean angiosperms based on compiled publications from 1929 to 2010. We found 78 publications supplied by four groups of Chilean researchers and some foreign specialists. Cytogenetic data have been reported for 139 Chilean angiosperm species (2.8 % of the total), which belong to 58 genera and 34 families. During 2001-2010 there was an increase in the number of publications, being available 40 reports including 95 additional species. Based on these data, we hope that such a trend can be maintained in the next decade if the current research groups and young specialists continue to be interested in the study of native plants. Los datos citogenéticos sobre angiospermas chilenas han sido reportados desde al menos ocho décadas atrás; sin embargo, mucha de esta información está dispersa en diversas fuentes y no está disponible como un documento completo que permita tener una visión general sobre los avances y vacíos en esta materia. El objetivo de este trabajo es resumir los avances y proyecciones sobre los estudios citogenéticos disponibles para angiospermas chilenas, basado en publicaciones recopiladas desde 1929 hasta el 2010. Nosotros encontramos 78 publicaciones aportadas por cuatro grupos de investigadores chilenos y por algunos especialistas extranjeros. Datos citogenéticos han sido reportados para 139 especies de angiospermas chilenas (2.8 % del total), las cuales pertenecen a 58 géneros y 34 familias. Durante los a os 2001-2010, existió un incremento en el número de publicaciones estando disponibles 40 reportes que incluyen 95 especies adicionales. Basados en estos datos, esperamos que esta tendencia pueda ser mantenida en la siguiente década si los actuales grupos de investigación y especialistas jóvenes siguen interesados en estudiar plantas nativas.
REGISTRO DE POLIPLOIDIA EN LA ALMEJA DULCEACUICOLA MUSCULIUM ARGENTINUM (D'ORBIGNY 1835) (SPHAERIIDAE, VENEROIDA)
Jara-Seguel,Pedro; Peredo,Santiago; Parada,Esperanza;
Gayana (Concepción) , 2005, DOI: 10.4067/S0717-65382005000100006
Abstract: the polyploidy is an unusual character in bivalve mollusks. however, cytogenetic data documented for north-hemispheric species of the subfamily sphaeriinae (family sphaeriidae), showed chromosome numbers ranging from 36 to ca. 247. the freshwater clam musculium argentinum (d'orbigny 1835) has a polyploid chromosome number 2n = ca. 130, which shows that polyploidy likewise may be present in south american sphaeriids. these cytogenetic data suggest that the subfamily sphaeriinae could constitute a mature polyploid complex
REGISTRO ACTUAL DE ESPECIES DEL GENERO MUSCULIUM LINK, 1807 (BIVALVIA: SPHAERIIDAE) EN CHILE CON NOTAS SOBRE MORFOLOGIA Y BIOMETRIA DE SUS POBLACIONES
Parada,Esperanza; Peredo,Santiago; Jara-Seguel,Pedro;
Gayana (Concepción) , 2009, DOI: 10.4067/S0717-65382009000100008
Abstract: this study reports the present distribution range of musculium argentinum (d'orbigny, 1835) ?namusculiumpatagonicum pilsbry, 1911 in chile, from sampling data carried out from 2002 to 2006. morphological and biometric characteristics of the studied populations showthatm. argentinum is discontinually distributed between 38°s - 41°s and 71°w - 72°w, inhabiting fluvial and lacustrine waters. m. patagonicum was reported in a lentic environment. (51°42's; 72°25'w). both species are morphologically very similar. m. argentinum differs from m. patagonicum because de first has their valves more markedly cuadrangular or trapezoidal with the posterior end slightly truncated, upper dorsal extremes markedly cuadrangular, hinge plate less solid, nearly straight or weakly curved. constant hinge length - shell length ratio. the shell outline of m. patagonicum is not as markedly trapezoidal as inm. argentinum. in the first, the posterior margin is less abrutptly truncated, and the shell outline not sharp-cornered as is typical for m. argentinum. the hinge plate in m. patagonicum is always weakly curved never straight or broken as in m. argentinum. the collected material is deposited at the zoological collection of the catholic university of temuco and in the malacological section of the nacional museum of natural history, chile.
CONTEOS CROMOSOMICOS EN PHILESIA MAGELLANICA J.F.GMEL. (LILIALES: PHILESIACEAE)
Jara-Seguel,Pedro; Fuentes-Ramírez,Andrés;
Gayana. Botánica , 2007, DOI: 10.4067/S0717-66432007000200010
Abstract: mitotic chromosome counts documented here for philesia magellanica j.f.gmel. (philesiaceae) showed a diploid number 2n = 30 (x = 15), which is different to the numbers reported previously for the species. the 2n number of p. magellanica is similar to that documented previously for lapageria rosea, which indicate a constancy of chromosome number within the family
CHROMOSOME NUMBERS IN CHILEAN SPECIES OF LUZURIAGA RUIZ ET PAV. (LUZURIAGACEAE)
Jara-Seguel,Pedro; Zú?iga,Cristina A;
Gayana. Botánica , 2005, DOI: 10.4067/S0717-66432005000100010
Abstract: mitotic chromosome counts for luzuriaga radicans ruiz et pav. and l. polyphylla (hook) j.f. macbr. from chile, reported here for the first time, are the same as those reported for l. parviflora (hook) kunth in new zealand and l. marginata (gaertner) benth. on falkland islands (2n = 2x = 20). these results indicate a constancy of chromosome number in the genus luzuriaga
EL CARIOTIPO DE LAPAGERIA ROSEA RUIZ ET PAV. (LILIALES: PHILESIACEAE)
Jara-Seguel,Pedro; Zú?iga,Cristina A.;
Gayana. Botánica , 2004, DOI: 10.4067/S0717-66432004000200007
Abstract: lapageria rosea ruiz et pav. showed an asymmetric and bimodal karyotype 2n = 2x = 30, with three metacentric, six submetacentric and six subtelocentric chromosome pairs. one b chromosome pair was also observed. the total chromosome length (2n) was 131.3 + 0.22 μm
Comparación del cariotipo de Eucalyptus globulus y Eucalyptus cladocalyx (Myrtaceae)
Mora,Freddy; Palma-Rojas,Claudio; Jara-Seguel,Pedro;
Agricultura Técnica , 2005, DOI: 10.4067/S0365-28072005000100002
Abstract: mitotic metaphase plates were analyzed in eucalyptus globulus labill. and eucalyptus cladocalyx f. muell. the chromosomes were observed by squashing root tips, pre-treated with 8-hydroxyquinoline and stained with the feulgen reaction. both, e. globulus and e. cladocalyx had a karyotype of 2n = 22, with 1a symmetry level, and chromosome sizes varying between 0.68 and 2.03 m m. mean chromosome size differed significantly between e. cladocalyx (1.42 m m) and e. globulus (1.02 m m) (p < 0.01). the greater chromosomal size of e. globulus suggests a greater amount of dna, probably originated by structural alterations. this evolutionary pattern of karyotype morphology might be associated, as well, with a high level of conservation in chromosome morphology.
CONTEOS CROMOSOMICOS EN PHILESIA MAGELLANICA J.F.GMEL. (LILIALES: PHILESIACEAE) CHROMOSOME COUNTS IN PHILESIA MAGELLANICA J.F.GMEL. (LILIALES: PHILESIACEAE)
Pedro Jara-Seguel,Andrés Fuentes-Ramírez
Gayana. Botanica , 2007,
Abstract: Mitotic chromosome counts documented here for Philesia magellanica J.F.Gmel. (Philesiaceae) showed a diploid number 2n = 30 (x = 15), which is different to the numbers reported previously for the species. The 2n number of P. magellanica is similar to that documented previously for Lapageria rosea, which indicate a constancy of chromosome number within the family
REGISTRO ACTUAL DE ESPECIES DEL GENERO MUSCULIUM LINK, 1807 (BIVALVIA: SPHAERIIDAE) EN CHILE CON NOTAS SOBRE MORFOLOGIA Y BIOMETRIA DE SUS POBLACIONES PRESENT RECORD OF SPECIES OF MUSCULIUM LINK, 1807 (BIVALVIA: SPHAERIIDAE) IN CHILE WITH NOTES ON ITS MORPHOLOGY AND BIOMETRY OF ITS POPULATIONS
Esperanza Parada,Santiago Peredo,Pedro Jara-Seguel
Gayana (Concepción) , 2009,
Abstract: Se reporta el rango de distribución actual de Musculium argentinum (D'Orbigny, 1835) y Musculium patagonicum Pilsbry 1911 en Chile sobre la base de colectas realizadas entre lósanos 2002 al 2006. La caracterización morfológica y biométrica de las poblaciones estudiadas indican que M. argentinum se distribuye discontinuamente entre los paralelos 38°Sy41°Sy entre los meridianos 71 °0 y 72°0 habitando ambientes lacustres y fluviales. M. patagonicum fue registrado en un ambiente lacustre localizado en los 51°42'S; 72°25'0. Ambas especies son morfológicamente muy similares. M. argentinum difiere de M. patagonicum en que en el primero el contorno de sus valvas son marcadamente cuadrangulares o trapezoidales, con el extremo posterior suavemente truncado; con extremos superiores dorsales marcadamente cuadrangulares, charnela poco consistente, recta o levemente curvada, presentando una relación longitud de charnela vs longitud valvar constante. M. patagonicum es más globoso en su contextura general, el contorno de sus valvas es más redondeado, menos trapezoidal y con margen posterior no abrupto y el bosquejo general de las valvas no presenta esquinas marcadas en la región dorsal, característica típica de M. argentinum. La charnela de M. patagonicum es curvada nunca derecha o quebrada como en M. argentinum. El material colectado se encuentra depositado en la Colección Zoológica de la Universidad Católica de Temuco y en la Sección de Malacología del Museo Nacional de Historia Natural, Chile. This study reports the present distribution range of Musculium argentinum (D'Orbigny, 1835) nAMusculiumpatagonicum Pilsbry, 1911 in Chile, from sampling data carried out from 2002 to 2006. Morphological and biometric characteristics of the studied populations showthatM. argentinum is discontinually distributed between 38°S - 41°S and 71°W - 72°W, inhabiting fluvial and lacustrine waters. M. patagonicum was reported in a lentic environment. (51°42'S; 72°25'W). Both species are morphologically very similar. M. argentinum differs from M. patagonicum because de first has their valves more markedly cuadrangular or trapezoidal with the posterior end slightly truncated, upper dorsal extremes markedly cuadrangular, hinge plate less solid, nearly straight or weakly curved. Constant hinge length - shell length ratio. The shell outline of M. patagonicum is not as markedly trapezoidal as inM. argentinum. In the first, the posterior margin is less abrutptly truncated, and the shell outline not sharp-cornered as is typical for M. argentinum. The hinge plate in M. patagonicum is always weak
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