Publications by authors named "Joseph Adjebeng-Danquah"
Early Leaf Spot (ELS) caused by the fungus Passalora arachidicola and Late Leaf Spot (LLS) also caused by the fungus Nothopassalora personata, are the two major groundnut ( L.) destructive diseases in Ghana. Accurate phenotyping and genotyping to develop groundnut genotypes resistant to Leaf Spot Diseases (LSD) and to increase groundnut production is critically important in Western Africa.
View Article and Find Full Text PDFDevelopment of maize hybrids that possess tolerant genes to low soil nitrogen is critical for long-term maize production in areas with low soil fertility. In this study, estimates for combining ability effects for grain yield and secondary traits of selected inbred lines, identify potential parents for hybrid development and yield potential of the crosses under sub-optimal and optimal N environments. One hundred hybrids were evaluated under sub-optimal and optimal N environments for two years.
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- The study analyzed the performance of 36 groundnut genotypes in different environmental conditions across Ghana's major agro-ecological zones, focusing on specific phenotypic traits preferred by farmers.
- It utilized three statistical models (AMMI, GGE, and Finlay-Wilkinson regression) to evaluate genotype-by-environment interactions, highlighting that the choice of model impacts how genotypes and locations are ranked.
- The research underscored the significance of location in cultivar placement and suggested the need for thorough testing across environments to determine the best-performing genotypes before nationwide adoption, identifying ICGV-IS 141120 and ICGV-IS 13937 as the top performers.
Information on combining ability and reciprocal effects (REC) facilitates efficient utilization of genetic materials in a breeding program. This study was conducted (at the CSIR-Savanna Agricultural Research Institute, Ghana) to determine general combining ability (GCA) and specific combining ability (SCA), heritability, genetic advance, GCA, and SCA effects as well as the relationship between parents per se performance and progenies for yield components and maturity traits in cowpea. The test populations were derived using a 5 × 5 complete diallel cross of parents with different yield attributes and maturity durations.
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- Genetic diversity is crucial for crop improvement and adapting to changing environmental conditions.
- A study analyzed 89 cassava accessions using 35 microsatellite markers, revealing 167 alleles and significant polymorphism, particularly in local accessions compared to exotic ones.
- The analysis identified two subpopulations and seven distinct subgroupings, indicating a complex genetic structure and high variability, which is promising for future selection in breeding programs.