Browsing Faculty of Agriculture & Veterinary Medicine (FAg / FVM) by Author "Ochieng, Joel W."
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African Pastoralism: Genetic Imprints of Origins and Migrations.
Hanotte, Olivier; Bradley, Daniel G; Ochieng, Joel W.; Verjee, Yasmin; Hill, Emmeline W.; Rege, J. Edward O (2002)The genetic history of African cattle pastoralism is controversial and poorly understood. We reveal the genetic signatures of its origins, secondary movements, and differentiation through the study of 15 microsatellite ... -
Analysis of" -Kenyan isolates' of Fusarium "safani f. sp. phaseoli from common bean using colony characteristics, pathogenicity and microsatellite DNA
Mwang'ombe, AW; Kipsumba, Pixley K.; Ochieng, Joel W.; Kiprop, E. K.; Olubayo, F. M. (Department of Plant Science and Crop Protection, 2008)Fusarium solani (Mart) f.sp. phaseoli (Burk) Synd. and Hans., is a plant pathogeniC fungus that causes root rot in garden bean (Phaseo/us vulgaris L.). To evaluate methods used in classifying strains of this pathogen, 52 ... -
Elevated Gene Expression in Chalcone Synthase Enzyme Suggests an Increased Production of Flavonoids in Skin and Synchronized Red Cell Cultures of North American Native Grape Berries
Davis, Gina; Ananga, Anthony; Krastanova, Stoyanka; Sutton, Safira; Ochieng, Joel W.; Leong, Stephen; Violetka Tsolova, Violetka (Mary Ann Liebert, Inc, 2012)Anthocyanins are antioxidants and are among the natural products synthesized via the flavonoid biosynthesis pathway. Anthocyanins have been recommended for dietary intake in the prevention of cardiovascular diseases, cancer, ... -
Genetic Structure of Hartebeest Populations Straddling a Transition Zone between Morphotypes
Ouma, Collins; Roca, Alfred L.; Were, Tom; Raballah, Evans O.; Oguge, NO; Jura, Walter G.Z.O.; Ochieng, Joel W.; Hanotte, Olivier; Georgiadis, Nicholas (TextRoad Publication, 2011)Variation in mitochondrial and microsatellite DNA was used to define the genetic structure of hartebeest populations straddling a transition zone between two morphotypes (Alcelaphus buselaphus cokei and A. b. lelwel) in ... -
Genetic Variation Within Two Sympatric Spotted Gum Eucalypts Exceeds Between Taxa Variation
Ochieng, Joel W.; Shephered, M.; Baverstock, P. R.; Nikles, G.; Lee, D.J.; Henry, R.J. (2007)Population substructure and hybridization, among other factors, have the potential to cause erroneous associations in linkage disequilibrium (LD) mapping. Two closely related spotted gum eucalypts, Corymbia variegata and ... -
Microsatellites retain phylogenetic signals across genera in eucalypts (Myrtaceae)
Ochieng, Joel W.; Steane, Dorothy A.; Ladiges, Pauline Y.; Baverstock, Peter R.; Henry, Robert J.; Shepherd, Mervyn (2007)The utility of microsatellites (SSRs) in reconstructing phylogenies is largely confined to studies below the genus level, due to the potential of homoplasy resulting from allele size range constraints and poor SSR ... -
Nuclear ribosomal DNA diversity of a cotton pest (Rotylenchulus reniformis) in the United States
Tilahun, Yonathan; Soliman, Khairy; Lawrence, Kathy S.; Cseke, Leland J.; Ochieng, Joel W. (2008)The reniform nematode (Rotylenchulus reniformis) has emerged as a major cotton pest in the United States. A recent analysis of over 20 amphimictic populations of this pest from the US and three other countries has shown ... -
Nuclear ribosomal pseudogenes resolve a corroborated monophyly of the eucalypt genus Corymbia despite misleading hypotheses at functional ITS paralogs
Ochieng, Joel W.; Baverstock, Peter R.; Steane, Dorothy A.; Shepherd, Mervyn; Henry, Robert J. (Science Direct, 2007)Divergent paralogs can create both obstacles and opportunities for phylogenetic reconstruction. Phylogenetic relationships among eucalypt genera have been incongruent among datasets in previous studies, where morphological ... -
Phylogenetic relationships within and among Brassica species from RAPD loci associated with blackleg resistance
Cebert, Ernst; Ananga, Anthony O.; Soliman, Khairy; Kantety, Ramesh; Konan, Koffi; Ochieng, Joel W. (2008)The genus Brassica comprises economically important oilseed and vegetable crops. Their susceptibility to fungal diseases such as blackleg causes yield loss. In this study, thirty accessions from USDA germplasm collection ... -
Phylogenetics in plant biotechnology: principles, obstacles and opportunities for the resource poor
Ochieng, Joel W.; Muigai, Anne W. T.; Ude, George N (2007)Phylogenetic inference has become routine for most studies of genetic variation among plant taxa. However, inferring phylogenies can be confounded by both biological and computational or statistical complexities, resulting ...