Evaluación de apomixis en germoplasma seleccionado de mora de castilla Rubus glaucus Benth
Autores
Marmolejo Cortés, Diego Fernando
Director
Tipo de contenido
Trabajo de grado - Maestría
Idioma del documento
EspañolFecha de publicación
2010-11-17
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Resumen
El modo reproductivo de ocho ecotipos de mora de Castilla pertenecientes a la colección de materiales de la Universidad Nacional de Colombia sede Palmira se evaluó mediante: el clareo de sacos embrionarios, estimación de la viabilidad del polen y variabilidad de medios hermanos. Los análisis indican que los ocho ecotipos son apomicticos facultativos. La tendencia a la sexualidad encontrada se debe a su origen alotetraploide con alta homeologia cromosómica y por lo tanto formación de bivalentes. La aposporia, un tipo de apomixis en la cual el saco embrionario se forma a partir de la nucela, se observó en todos los ecotipos. Sacos múltiples o facultativos característicos de las moras apomícticas se registraron en seis ecotipos (mora sin espinas, Trujillo Espinas, Ranchona Juntas, Abrazos, Sara y Guática).
//Abstrac: Reproductive mode of eight ecotypes of Rubus glaucus belonging to the collection of the National University of Colombia campus Palmira was evaluated using: cleared of embryonic sacs, viability estimation of pollen and variability of half sibs. Analysis shown that eight ecotypes are facultative apomictic. Sexual tendency found is due its alotetraploid origin with chromosomal homology and as a consequence the formation of bivalents. Apospory, a kind of apomixis in which the embryonic sac is formed from nucellus was observed in all ecotypes. Multiple or facultative sacs that are characteristics of apomictic blackberries were observed in six ecotypes (blackberry thornless, Trujillo Espinas, Ranchona Juntas, Abrazos, Sara and Guatica).
//Abstrac: Reproductive mode of eight ecotypes of Rubus glaucus belonging to the collection of the National University of Colombia campus Palmira was evaluated using: cleared of embryonic sacs, viability estimation of pollen and variability of half sibs. Analysis shown that eight ecotypes are facultative apomictic. Sexual tendency found is due its alotetraploid origin with chromosomal homology and as a consequence the formation of bivalents. Apospory, a kind of apomixis in which the embryonic sac is formed from nucellus was observed in all ecotypes. Multiple or facultative sacs that are characteristics of apomictic blackberries were observed in six ecotypes (blackberry thornless, Trujillo Espinas, Ranchona Juntas, Abrazos, Sara and Guatica).
Abstract
Palabras clave
Ecotipos ; Ecotypes ; Apomixis ; Variación genética ; Genetic variation ; Germoplasma ; Germplasm ; Mora ; Mulberries