Research Papers/Topics in Plant Breeding

Pattern of Genetic Variability in Nsukka Yellow Pepper (Capsicum Annuum L.) Genotypes

ABSTRACT  Nsukka yellow pepper genotypes were evaluated in 2009 and 2010 planting seasons to determine the pattern of genetic variability in its population. The initial collection comprising eighteen genotypes were assembled from the local farmers and evaluated in 2009 planting season. Forty nine promising genotypes were selected on individual plant basis and reevaluated in 2010 planting season. The results of the performance of the genotypes in both years showed that there was considerable ...

Improvement of Selected Okra (Abelmoschus Spp.) Varieties for Fruit Yield and Productivity

ABSTRACT Four field experiments were conducted at the Teaching and Research Farm of the Department of Crop Science, University of Nigeria, Nsukka to: (i) improve the photoperiodic response, especially in local (late) maturing varieties of Okra; (ii) estimate heterosis and heritability for improved yield and productivity; (iii) determine combining ability and gene effects of 13 genotypes of okra; (iv) estimate gene effects of quantitative traits; (v) determine inheritance pattern of qualitativ...

Genetic Analysis of Tolerance to Low Soil Nitrogen in Intermediate Maturing Maize (Zea Mays L.) Inbred Lines

ABSTRACT  Low soil nitrogen (N) is one of the most important constraints to maize production in subSaharan Africa (SSA) in general and in particular the Bimodal Humid Forest Zone (BHFZ) of Cameroon. The development and adoption of maize varieties tolerant to low N soils could reduce the need for nitrogen inputs and significantly contribute to sustainable maize production. The objectives of this research were to: i) identify maize production constraints and farmers preferred maize characteris...

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 and tole...

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

ABSTRACT Soybean 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 evaluat...

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

ABSTRACT In 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 whi...

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 heterozygosity of...

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. Twelv...

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 with P...

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 diall...

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 experiments...

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

ABSTRACT Stem 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 ...

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

ABSTRACT Soybean [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 her...

DIVERSITY, SELECTION ANO GENOTYPE X ENVIRONMENT INTERACTION IN COWPEA vigua cmguiculata (L.) \\ 1 ALP

Thirty-one cowpea genotypes from 2000 planting season of derived savanna ecology to determine the genetic diversity, using multivariate analysis. In four location - season environments twenty cultivars were grown to measure genotype x environment interaction and stability. Data were collected on gronomic and yield characters. The first three axes of the Principal Component Analysis (PCA) captureJ 40. 7% or the total variation among the enteries. lleight at flowering and maturity, length ...


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