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Genetic variation and genotype X environment interaction for yield and other agronomic traits in cassava in Nigeria

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Title Genetic variation and genotype X environment interaction for yield and other agronomic traits in cassava in Nigeria
 
Creator Egesi, Chiedozie N.
Ilona, Paul
Ogbe, F.O.
Akoroda, M.O.
Dixon, A.
 
Subject cassava
genotypes
african cassava mosaic virus
cassava green mite
fresh root yield
multiple trait
genetic variation
agro-ecologies
 
Description The identification of superior genotypes and mega-environments on the basis of multiple traits is a key objective of multi-environment trials in cassava (Manihot esculenta Crantz). The objective of this study was to examine the genetic variation and genotype 3 environment interaction (GEI) effects for fresh root yield, six other agronomic traits, and severity ratings for cassava mosaic disease (CMD) and cassava green mite (CGM) in 40 genotypes of cassava. Experiments were conducted using a randomized complete-block design with four replications for 2 yr in three representative agro-ecological zones in Nigeria. Site regression (SREG) analysis revealed that GEI was a major source of fresh root yield variation and the different testing sites discriminated among the genotypes. Genotypes TMS 980581, TMS 974763, TMS 980002, TMS 993073, and M980068 were highest yielding at Otobi and Umudike, whereas TMS 980510, TMS 974779, and TMS 92B00068 yielded the most at Ishiagu. TMS 982226, TMS 920325, and M980028 had the poorest performance across all locations. Genotypes with the highest yield showed the lowest CMD scores, whereas very tall (well above 2 m) plants had low harvest index on the basis of multiple trait analysis. We identified optimally adapted genotypes for commercial cassava production in different areas in Nigeria.
 
Date 2007-07
2018-04-24T08:40:10Z
2018-04-24T08:40:10Z
 
Type Journal Article
 
Identifier Egesi, C.N., Ilona, P., Ogbe, F.O., Akoroda, M. & Dixon, A. (2007). Genetic variation and genotype× environment interaction for yield and other agronomic traits in cassava in Nigeria. Agronomy Journal, 99, 1137-1142.
0002-1962
https://hdl.handle.net/10568/92178
https://doi.org/10.2134/agronj2006.0291
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Format p. 1137-1142
 
Publisher Wiley