Vita.Trials were conducted in Texas, and in Kenya between 1990 and 1993 to evaluate performance a... more Vita.Trials were conducted in Texas, and in Kenya between 1990 and 1993 to evaluate performance and stability of single, three-way, and double crosses of grain sorghum, estimate genetic effects, and evaluate grain yield prediction methods for three-way hybrids. Grain yield heterosis was estimated for single and three-way crosses. Preliminary evaluations were at College Station in 1990, and selected entries evaluated in four environments over two years in Texas. A complete set, excluding reciprocals, of parents, single, and three-way crosses, was evaluated in five environments in Kenya. Genetic effects were estimated from experiments in Kenya. In Texas, single and three-way crosses differed infrequently for characters studied, while these hybrid-types outperformed double crosses most times. Double crosses were most stable followed by three-way crosses, single crosses, and parental lines, respectively, for grain yield and other agronomic characters. In Kenya, three-way hybrids outyiel...
In this emerging era of global, fast-paced knowledge-based economy, universities, as major centre... more In this emerging era of global, fast-paced knowledge-based economy, universities, as major centres of learning and research, are becoming increasingly important as sources of ideas, knowledge, skills, innovation and technological advances. These ideas can be turned into new products, processes and systems needed to drive their respective national economies, and thus placing universities at the centre of the national innovation systems. Consequently, commercialization of research outputs from universities to industry has become an area of strong policy interest in African countries. To assess initiatives to commercialize research outputs by Kenyan universities, a cross-sectional study was carried out in seventeen well established universities (15 public and 2 private), all accredited by the Commission for University Education, Kenya. Deans, Registrars, Directors or Deputy (Directors/Vice Chancellors) responsible for research and development were interviewed. All the surveyed universi...
Low soil pH is a major constraint to maize (Zea mays L.) production on tropical soils due to toxi... more Low soil pH is a major constraint to maize (Zea mays L.) production on tropical soils due to toxic levels of aluminium (Al) and the concomitant phosphorus (P) deficiency that hinders plant root growth. A preliminary laboratory screening was conducted to test 75 Kenyan landrace maize accessions and 12 commercial varieties for response to low soil pH and Al toxicity
Inheritance of resistance to cowpea aphid, Aphis craccivora Koch, in three resistant cultivars of... more Inheritance of resistance to cowpea aphid, Aphis craccivora Koch, in three resistant cultivars of cowpea, Vigna unguiculata (L.) Walp, was studied. The parents, F1 and F2 population were grown in an insect-proof screenhouse. Each 3-day-old seedling was infested with 10 apterous adult aphids. Seedling reaction was recorded when the susceptible check was killed. The segregation data revealed that the resistance of ICV11 and TVU310 is governed by single dominant genes. All the F2 seedlings of the cross ICV10xTVU310 were resistant, indicating that they have the same gene for resistance. However, the F2 populations from the crosses ICV10xICV11 and ICV11xTVU310 segregated in a ratio of 15∶1, indicating that the dominant genes in ICV11 and TVU310 are non-allelic and independent of each other. The resistance gene of ICV10 and TVU310 is designated as Ac1 and that of ICV11 as Ac2.
Vita.Trials were conducted in Texas, and in Kenya between 1990 and 1993 to evaluate performance a... more Vita.Trials were conducted in Texas, and in Kenya between 1990 and 1993 to evaluate performance and stability of single, three-way, and double crosses of grain sorghum, estimate genetic effects, and evaluate grain yield prediction methods for three-way hybrids. Grain yield heterosis was estimated for single and three-way crosses. Preliminary evaluations were at College Station in 1990, and selected entries evaluated in four environments over two years in Texas. A complete set, excluding reciprocals, of parents, single, and three-way crosses, was evaluated in five environments in Kenya. Genetic effects were estimated from experiments in Kenya. In Texas, single and three-way crosses differed infrequently for characters studied, while these hybrid-types outperformed double crosses most times. Double crosses were most stable followed by three-way crosses, single crosses, and parental lines, respectively, for grain yield and other agronomic characters. In Kenya, three-way hybrids outyiel...
In this emerging era of global, fast-paced knowledge-based economy, universities, as major centre... more In this emerging era of global, fast-paced knowledge-based economy, universities, as major centres of learning and research, are becoming increasingly important as sources of ideas, knowledge, skills, innovation and technological advances. These ideas can be turned into new products, processes and systems needed to drive their respective national economies, and thus placing universities at the centre of the national innovation systems. Consequently, commercialization of research outputs from universities to industry has become an area of strong policy interest in African countries. To assess initiatives to commercialize research outputs by Kenyan universities, a cross-sectional study was carried out in seventeen well established universities (15 public and 2 private), all accredited by the Commission for University Education, Kenya. Deans, Registrars, Directors or Deputy (Directors/Vice Chancellors) responsible for research and development were interviewed. All the surveyed universi...
Low soil pH is a major constraint to maize (Zea mays L.) production on tropical soils due to toxi... more Low soil pH is a major constraint to maize (Zea mays L.) production on tropical soils due to toxic levels of aluminium (Al) and the concomitant phosphorus (P) deficiency that hinders plant root growth. A preliminary laboratory screening was conducted to test 75 Kenyan landrace maize accessions and 12 commercial varieties for response to low soil pH and Al toxicity
Inheritance of resistance to cowpea aphid, Aphis craccivora Koch, in three resistant cultivars of... more Inheritance of resistance to cowpea aphid, Aphis craccivora Koch, in three resistant cultivars of cowpea, Vigna unguiculata (L.) Walp, was studied. The parents, F1 and F2 population were grown in an insect-proof screenhouse. Each 3-day-old seedling was infested with 10 apterous adult aphids. Seedling reaction was recorded when the susceptible check was killed. The segregation data revealed that the resistance of ICV11 and TVU310 is governed by single dominant genes. All the F2 seedlings of the cross ICV10xTVU310 were resistant, indicating that they have the same gene for resistance. However, the F2 populations from the crosses ICV10xICV11 and ICV11xTVU310 segregated in a ratio of 15∶1, indicating that the dominant genes in ICV11 and TVU310 are non-allelic and independent of each other. The resistance gene of ICV10 and TVU310 is designated as Ac1 and that of ICV11 as Ac2.
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Papers by George Ombakho