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Journal of Heredity Advance Access published online on July 13, 2005
Journal of Heredity, doi:10.1093/jhered/esi084
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© The American Genetic Association. 2005. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org.
Received November 10, 2004
Accepted April 11, 2005

Brief Communication

Epistasis in the Expression of Relevant Traits in Cassava (Manihot esculenta Crantz) for Subhumid Conditions

N. T. Cach 1, J. C. Perez 2, J. I. Lenis 2, F. Calle 2, N. Morante 2, and H. Ceballos 3*

1 From the Hue University of Agriculture and Forestry, 24 Phuong Hung Street, Hue City, Vietnam
2 International Center for Tropical Agriculture (CIAT), Apartado Aéreo 6713, Cali, Colombia
3 International Center for Tropical Agriculture (CIAT), Apartado Aéreo 6713, Cali, Colombia; Universidad Nacional de Colombia, Carrera 32, Chapinero vía Candelaria, Palmira, Colombia

* To whom correspondence should be addressed.
H. Ceballos, E-mail: h.ceballos{at}cgiar.org


  Abstract

There is limited knowledge on the inheritance of agronomic traits in cassava and the importance of epistasis for most crops. A nine-parent diallel study was conducted in subhumid environments. Thirty clones were obtained from each F1 cross. Each clone was represented by six plants, which were distributed in three replications at two locations. Therefore the same 30 genotypes of each F1 cross were planted in the three replications at the two locations. Analysis of variance suggested significant genetic effects for all variables analyzed (reaction to thrips, fresh root and foliage yields, harvest index, dry matter content, and root dry matter yield). Significant epistatic effects were observed for all variables, except harvest index. Dominance variance was always significant, except for dry matter content and dry matter yield. Additive variance was significant only for reaction to thrips. Results suggested that dominance plays an important role in complex traits such as root yield. The significance of epistasis can help us understand the difficulties of quantitative genetics models and QTLs in satisfactorily explaining phenotypic variation in traits with complex inheritance. Significant epistasis would justify the production of inbred parental lines to fix favorable allele combinations in the production of hybrid cassava cultivars.


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M. C. Rojas, J. C. Perez, H. Ceballos, D. Baena, N. Morante, and F. Calle
Analysis of Inbreeding Depression in Eight S1 Cassava Families
Crop Sci., March 17, 2009; 49(2): 543 - 548.
[Abstract] [Full Text] [PDF]


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