Genetic parameters of cassava
Material type:![Article](/opac-tmpl/lib/famfamfam/AR.png)
- Manihot esculenta
- Africa
- Bacterioses
- Branching
- Canopy
- CASSAVA AFRICAN MOSAIC VIRUS
- CASSAVA BACTERIAL BLIGHT
- COMPOSITION
- Developmental stages
- DISEASES AND PATHOGENS
- DRY MATTER
- Flowering
- Harvest index
- HCN CONTENT
- Nigeria
- Pests
- Plant anatomy
- Plant breeding
- PLANT HEIGHT
- Productivity
- Resistance
- ROOT PRODUCTIVITY
- Roots
- Stems
- Viroses
- Developmental stages
- FOLIAGE
- Yuca
- Articles in proceedings
- Artículos en memorias
- Cassava
- Serial book chapters
- 22704
Item type | Current library | Collection | Call number | Copy number | Status | Date due | Barcode | Item holds | |
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CIAT Library Document collection CINFOS | Document Collection CINFOS | 22704 (Browse shelf(Opens below)) | c.1 | Short Loan |
Se estudiaron 6 poblaciones diferentes de yuca, cultivada durante 1979-80 y 1980-81 en International Institute of Tropical Agriculture, Ibadan, Nigeria, para estimar los parametros geneticos de 22 caracteristicas de yuca. Los datos, una vez analizados, revelaron que: existe una variacion considerable dentro de y entre las poblaciones para la mayoria de las caracteristicas; los C.V. para fenotipo y genotipo fueron mas altos para el rendimiento de la raiz (85 y 62 por ciento , resp.), bastante altos para las raices/planta y el tamano de la raiz (60 y 40 por ciento ), moderados para el IC y el no. total de ramas (45 y 30 por ciento , resp.) y bajos (menores que 30 y 15 por ciento ) para el tamano del tallo, la extension de la cobertura foliar y la altura de la planta en el momento de la cosecha. Las caracteristicas heredables estimadas al igual que las ganancias geneticas esperadas tambien variaron considerablemente. En prom., el rendimiento y no. de raices mostraron una heritabilidad (50 por ciento ) moderadamente alta y una alta respuesta esperada a la seleccion (88 y 64 por ciento , resp.). Se obtuvieron valores de heritabilidad relativamente altos para el IC (49 por ciento ) y el contenido de MS (52 por ciento ), pero solo estuvieron asociados con ganancias geneticas esperadas en un 50 y 29 por ciento , resp. Las caracteristicas agronomicas tales como tamano del tallo, extension de la cobertura foliar y altura de la planta en el momento de la cosecha mostraron valores de heritabilidad entre moderados y bajos (32-42 por ciento ), asociados con bajos valores esperados de mejoramiento genetico (15-18 por ciento ). (RA-CIAT) spa
Six diverse cassava populations grown during 1979-80 and 1980- 81 were studied at the International Institute of Tropical Agriculture, Ibadan, Nigeria, to estimate genetic parameters for 22 traits of cassava. The data, when analyzed, revealed that: considerable variation existed both within and between the populations for most of the characters; the C.V. for phenotype and genotype were largest for root yield (85 and 62 percent, resp.), quite large for the roots/plant and root size (60 and 40 percent), moderate for HI and total no. of branches (45 and 30 percent, resp.), and low (less than 30 and 15 percent) for stem girth, canopy width, and plant height at harvest. Heritability estimates as well as expected genetic gain also varied considerably. On av., root yield and no. of roots showed moderately high heritability (50 percent) and high expected response to selection (88 and 64 percent, resp.). Relatively high heritability values were obtained for HI (49 percent) and DM content (52 percent), but they were associated with expected genetic gains of only 50 and 29 percent, resp. Agronomic traits such as stem girth, canopy width, and plantheight at harvest showed moderate-to-low heritability values (32-42 percent) associated with low expected genetic advance (15-18 percent). (AS) eng