Morphological and chromosomal characterization of Commelina benghalensis L. (Commelinaceae) from Argentina

 

Autores
Grabiele, Mauro; Honfi, Ana Isabel; Grabiele, Marina; Debat, Humberto Julio; Daviña, Julio Rubén
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2009
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
Commelina benghalensis is a small herb native to tropical Africa and Asia but introduced elsewhere. In America it was found growing at open fields, border of woods and cultivated areas (south USA, Mexico, West Indies, French Guiana, Brazil, Bolivia, Paraguay) as a weed or invasive plant and its difficult manage causes economic damages in diverse agroecosystems all over the world. Commelina benghalensis was found at a border of Misiones´ forest (Argentina, Misiones Province, Guaraní Departament, El Soberbio, 27º17’54.5’’S; 54º12’19’’W) and classical cytogenetic techniques were applied in order to analyze its genetic system. Commelina benghalensis is a diploid with 2n = 2x = 22 median size chromosomes (4.05 - 6.60 μm) and 55.04 μm/genome. Its karyotype, 8m + 10sm + 4st is unimodal (A2 = 0.14 / R = 1.63) and slightly asymmetrical (A1 = 0.44 / i = 34.75 / r>2 = 0.55) (3A Stebbins category). Chromosome pair No. 11 (st) has a terminal macrosatellite in the short arm and presumably carry the active NOR. Microsporogenesis is normal and produces viable polen grains (>80%). Meiotic behaviour is regular. In PMC at diakinecis / metaphase I, 11 bivalents were observed, mainly rings (92.7%) with distal chiasmata (96.7%) and an average of chiasmata / bivalent = 1.90. The meiotic system in conjuntion with a particular breeding system promotes a high genetic homogeneity, and suggests that this species has coadapted features with adaptative advantages allowing an invader behaviour.
Idioma
español
OAI Identifier
oai:ri.conicet.gov.ar:11336/36644
Enlace del recurso
http://hdl.handle.net/11336/36644
Nivel de acceso
Acceso abierto
Materia
MORFOLOGIA
SISTEMA GENÉTICO
PLANTA INVASORA
MICROSPOROGÉNESIS
Morphology
genetic system
invasive plant
microsporogenesis
karyotype
cariotipo
Otras Ciencias Biológicas
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS