Genotype X Environment Interaction Studies With Cassava

Otoo, J. A.; Dixon, A. G. O.; Asiedu, Robert; Okeke, J. E.; Maroya, G.N.; Tougnon, K.; Okoli, O. O.; Tetteh, J. P.; Hahn, S. K.

doi:10.17660/actahortic.1994.380.22

Cited by 5 publications

(3 citation statements)

References 1 publication

(1 reference statement)

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“…A highly significant genotype · environment interaction for fresh root yield, cassava bacterial blight and other cassava diseases was also reported from other studies in Africa (Otoo et al, 1994;Dixon and Nukenine, 2000). But, as our data show, an evaluation of genotype performance in 1 year (Fokunang et al, 2000) and without artificial inoculation (Otoo et al, 1994;Dixon and Nukenine, 2000;Fokunang et al, 2000;Restrepo et al, 2000b) is not sufficient to discriminate genotypes.…”

Section: Genotypesupporting

confidence: 78%

Genotype � environment interactions in symptom development and yield of cassava genotypes with artificial and natural cassava bacterial blight infections

et al. 2005

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Thirty-seven cassava genotypes from Benin, including advanced breeding lines, were tested for their reaction to bacterial blight in the forest-savanna transition, wet savanna and dry savanna zones of Benin. Sixteen genotypes were repeated in 12 environments. In year 1998, genotypes RB92164, RB92022, TMS30572, BEN86004, RB92033 and Dangbo2, and in year 2000, genotypes RB92202, RB92151, RB92132 and TMS30572 were resistant in one ecozone. Among the more resistant genotypes, CAP94030, BEN86040, RB89509, RB92132 and TMS30572 showed low interaction across environments and were most stable in disease reaction. Ten genotypes were classified as high yielding across environments. Among the more resistant group of genotypes, only TMS30572 and RB89509 were high yielding, with RB89509 being unstable in yield across environments. Selection of genotypes proved reliable only after artificial inoculation. Comparing environments, artificially inoculated treatments in the wet savanna zone and in the forest-savanna transition zone with stable high symptom severity proved most suitable for screening of genotypes, while the wet savanna zone with low natural infection in year 1998 was suitable for production of propagation material, and the site in the dry savanna zone with natural infection in year 1998 was the best environment for cassava production. The correlation between disease severity and root yield was significant only for the non-inoculated treatment in the dry savanna zone in year 2000 (R ¼ )0.58), but not in any other environment. Among the 37 genotypes tested, several genotypes can be recommended to farmers in specific ecozones, and genotype TMS30572 revealed as relatively stable in disease resistance and in high yield across ecozones.

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Section: Genotypesupporting

confidence: 78%

Genotype � environment interactions in symptom development and yield of cassava genotypes with artificial and natural cassava bacterial blight infections

et al. 2005

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“…AMMI4 explained 97% of the G × E interactions for CMD. Otoo et al (1994) and Dixon and Nukenine (1997) also reported greater G × E interaction effects than those because of genotypes alone in cassava yield trials.…”

Section: Stability Analysesmentioning

confidence: 95%

Reaction of Cassava Genotypes to the Cassava Mosaic Disease in Three Distinct Agroecologies in Nigeria

Ngeve¹,

Nukenine²,

Dixon³

2003

Journal of Phytopathology

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Nine cassava genotypes were grown at six representative sites in Nigeria for 3 years to study their response to cassava mosaic disease (CMD), investigate the influence of genotype × environment (G × E) interactions on their reactions to the disease, and identify genotypes with stability to the disease, using the Additive Main Effects and Multiplicative Interaction statistical model. Environments, genotypes and G × E interactions were highly significant (P < 0.01) for the disease. The G × E interactions accounted for 19.5% of the treatment sums of squares for CMD and influenced the relative ranking of genotypes across environments. The magnitude of the G × E interaction effect for CMD was larger than that of genotypes. Examination of the G × E interaction structure revealed specific areas where screening of cassava genotypes for resistance to CMD could be performed best. The study identified genotypes such as TMS 30001 and 63397 with resistance to CMD and CMD‐stable clone U/41044, which could be distributed to growers, and sites such as Ibadan and Ubiaja with high CMD severity for screening genotypes for reaction to CMD.

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“…West Africa and Brazil and selecting and testing clones at the farm level in different agro-ecologies (Hahn, Howland, and Terry 1980;Otoo et al 1994; Mba and Dixon 1998). The COSCA researchers discovered that the farm-level yield of the TMS varieties in Nigeria was 40 percent higher than that of the local Table 5.2.…”

Section: Mosaic-resistant Varieties With Many Other High-yielding Varmentioning

confidence: 99%

The cassava transformation: Africa's best-kept secret

2002

Choice Reviews Online

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Percentage of Villages Where Women and Men Carried Out Cassava Processing Tasks, Average for Six caSCA'Sludy Counlries ....... 150 11.1 Percentage of Rural Households lhat Prepared and Ale Meals of Major Staples in a One-Week Interval during lhe COSCA Study in lhe ale d'ivoire, Ghana, Nigeria, Tanzania, and Uganda. 159 11.2 Percentage of Rural Households' Food Expenditure on Dried Cassava Roots and Granules in Lowest-and Highest-Income Quartile in the ate d'ivoire,

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Genotype X Environment Interaction Studies With Cassava

Cited by 5 publications

References 1 publication

Genotype � environment interactions in symptom development and yield of cassava genotypes with artificial and natural cassava bacterial blight infections

Genotype � environment interactions in symptom development and yield of cassava genotypes with artificial and natural cassava bacterial blight infections

Reaction of Cassava Genotypes to the Cassava Mosaic Disease in Three Distinct Agroecologies in Nigeria

The cassava transformation: Africa's best-kept secret

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