Research Papers/Topics in Plant Breeding

Genetic diversity of arabusta coffee (coffea arabica l. X coffea canephora pierre) and their parental genotypes

ABSTRACT Coffee ranks second after petroleum in international trade. In Kenya, it supports over 600,000 households, contributes up to12% of export revenue and employs 30% of the total workforce in Agriculture. Arabica (Coffea arabica L.) and Robusta (Coffea canephora Pierre) are the two species under commercial cultivation. Arabica coffee has low genetic diversity and susceptible to Coffee Berry Disease (CBD) and Coffee Leaf Rust (CLR) while Robusta Coffee has considerable diversity an...

Path And Stability Analyses Of Yield And Yield Components Of Soybean (Glycine Max. L Merr.) Varieties Intercropped With Maize

ABSTRACTSoybean production in Kenya is estimated at 9,061MT. This is low compared to the annual demand of 100,000MT. This large deficit is met through importation which puts a strain to the economy’s foreign exchange. Soybean has the highest protein content (40-42%) among the food crops with oil content of18-22% comprised of 85% unsaturated fatty acids. These attributes make it an inexpensive source of proteins and desirable human diet. Released soybean varieties in Kenya have been evaluate...

Evaluation Of Chickpea (Cicer Arietinum L.) Genotypes For Host Plant Resistance To Ascochyta Blight (Ascochyta Rabiei) In Elgeyo-Marakwet, Uasin-Gishu And Baringo Counties Of Kenya

ABSTRACTIn Kenya, the counties of Elgeyo-Marakwet, Uasin-Gishu and Baringo, where maize, wheat and barley are normally grown, can be used to produce a second crop during the off-season (October-February) before the next cropping season or as a rotation crop during the main season (April-August). Introduction of drought tolerant leguminous crops such as chickpea in these counties is ideal in order to provide an alternative source of income to farmers. However Ascochyta blight (AB) disease whic...

Construction Of Genetic Linkage Map Of Cassava From Nachinyaya × Ar37-80 Mapping Population Using Dna Markers

ABSTRACT Cassava brown streak disease (CBSD) is the major constraint in Cassava (Manihot esculenta) production in Eastern Africa including Tanzania. Genetic linkage map is a prerequisite for QTL analysis; marker assisted breeding and map-based gene cloning. It is also a prerequisite for the study of inheritance of qualitative and quantitative traits and the molecular information can be applied in marker-assisted selection (MAS).Objectives of this study were to (I) determine heterozygosit...

Morphological And Genetic Characterization Of Bambara Groundnut (Vigna Subterranea (L.) Verdc.) Landraces In Kenya

ABSTRACT The existence of genetic diversity in germplasm collections is crucial for cultivar development. The objectives of this study were to determine genetic diversity of bambara groundnut (Vigna subterranea (L) Verdc.) landraces from Kenya using genetic markers and characterize bambara groundnut landraces from Kenya using morphological markers. Genetic and morphological relationships among bambara groundnuts accessions, were evaluated using morphological and microsatellite markers. ...

Combining Abilities And Heterosis For Ethanol Related Traits In Sweet Sorghum (Sorghum Bicolor L.)

ABSTRACT Sweet sorghum [Sorghum bicolor (L). Moench] is important for production of fodder and ethanol worldwide. Objectives of this study were to determine: (i) the most suitable harvesting stage for sweet sorghum for which ethanol production is a maximum, (ii) the combining abilities for ethanol related traits and (iii) the best sweet sorghum hybrids for production of industrial alcohol. Experiments were conducted in Nakuru (0° 23′S, 35° 35′E), Homa Bay (0.35o 13′07′′S, 3...

Assessment Of Diversity Of Blackberry (Rubus L. Subgenus Rubus Watson) Accessions In Kenya Using Morphological And Ssr Markers

ABSTRACT Morphological and genetic diversity are important components for cultivar development and are a pre-requisite to cultivar improvement. The probability of producing unique genotypes increases in proportion to the number of genes for which parents differ (genetic distance). The objectives of this study were to determine the morphological and genetic diversity among native blackberry (Rubus L. subgenus Rubus Watson) accessions in selected counties in Kenya and their relationship w...

Evaluation Of Advanced Wheat (Triticum Aestivum L.) Lines For Stem Rust (Puccinia Graminis F. Sp. Tritici) Resistance And Yield In Kenya

ABSTRACT Stem rust (Puccinia graminis f. sp. tritici) is one of the most important diseases of wheat (Triticum aestivum L.) and is known to cause major wheat yield losses in Kenya as well as other wheat growing countries of Africa and Asia. The present study aimed at; i) determining seedling, adult plant resistance and yield of 64 advanced wheat breeding lines, and ii) estimating the kind of gene action in inheritance of adult plant resistance to stem rust and yield components in a 6 6 ...

Evaluation Of Wheat (Triticum Aestivum L.) Genotypes For Resistance To Leaf Rust (Puccinia Triticina Eriks) In Kenya

ABSTRACT Leaf rust (Puccinia triticina) of wheat (Triticum aestivum L.) is one of the major foliar diseases contributing to yield losses in wheat worldwide. Objectives of this study were: (i) to determine genotypic variation among Kenyan wheat genotypes against leaf rust at adult plant stage (ii) to determine genotypic variation among Kenyan wheat genotypes against leaf rust at seedling stage (iii) to determine leaf rust virulence in Kenya using leaf rust differential sets. Three ex...

Effectiveness Of Adult And Seedling Resistance In Management Of Stem Rust (Puccinia Graminis F.Sp. Tritici) Of Wheat (Triticum Aestivum L.) In Cimmyt Lines

ABSTRACTStem rust of wheat (Triticum aestivum L.) caused by Puccinia graminis f.sp. tritici had been controlled globally through the use of resistant varieties. However, the emergence of a new and more virulent race Ug99 (designated TTKSK) and its variants reversed these gains. The objectives of this study therefore were: to assess the progress in using adult plant resistance (APR) in controlling stem rust in CIMMYT wheat lines and to evaluate CIMMYT wheat lines for seedling and adult plant r...

Stability And Genotype By Environment Analysis For Quality, Yield And Yield Components Of Soybean [Glycine Max (L.)] Lines

ABSTRACTSoybean [Glycine max (L.) Merrill.] Breeders’ prefer genotypes with high grain yield along with high oil and protein content. Soybean in Kenya is important in the manufacture of feed, food and natural resource management. Availability of high yielding and stable varieties is among the constraints that limit adoption and production of soybean in Kenya. The objectives of the study were to determine the performance of fifteen soybean genotypes in five environments, the broad sense heri...

Phenotypic Variation In Morphology, Yield And Seed Quality In Selected Accessions Of Leafy Amaranths

ABSTRACTVegetable amaranths are highly valued for being rich in proteins and micronutrients such as iron, calcium, zinc, vitamin C and vitamin A. In spite of the crop’s exceptional nutritional qualities, very little effort has been put in to improve the foliage yield potential in Kenya. Reports on morphological phenotypic variation analysis in Amaranthus are rare and detailed agronomic recommendations for leaf and seed yields and quality enhancement are scanty. Research on the extent of the...

Genetic Diversity of Legume Nodulating Bacteria and the Effect of Nitrogen Sources on the Yield of Common Bean in Western Kenya

ABSTRACTDeclining soil fertility in general and nitrogen (N) in particular limit crop production on many smallholder farms in western Kenya. Soil N deficiency is usually ameliorated with inorganic N fertilizers but their high costs preclude their use by resource poor smallholder farmers. In addition there are concerns that increased use of inorganic fertilizers could lead to environmental degradation. Organic inputs offer sustainable alternatives to expensive inorganic N fertilizers but the c...

Identification Of Maize (Zea Mays L.) Genotypes Resistant To Striga Hermonthica (Del.) And Determination Of Genetic Basis For Resistance

ABSTRACTThe obligate root hemi-parasite, Striga hermonthica (Del.) Benth., native to sub-Saharan Africa causes serious economic constraint to cereal production. There has been limited study to understand the genetics of Striga tolerance or resistance in maize in Kenya and the information on mechanisms of resistance to Striga in maize in very limited. T he use of maize ( Zea mays L.)genotypes that support reduced Striga hermonthica emergence can form an important basis fordeveloping Striga res...


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