![]() ![]() Mediante análisis bioinformáticos se identificaron cuatro genes candidatos presentes en los intervalos de los QTL. A través de un análisis no paramétrico de intervalo simple, se detectaron dos QTL que explican el 10,9 y el 12,6 % de la varianza fenotípica de la resistencia en campo a CBB. En la población de mapeo fueron detectados individuos con una segregación transgresiva tanto resistentes como susceptibles. La evaluación fenotípica se llevó a cabo en Puerto López (Meta), Colombia, durante la época de lluvias durante el segundo semestre de 2015. En este estudio se realizó un análisis de loci de rasgos cuantitativos (QTL) para la resistencia a CBB en condiciones naturales de infección, usando una población de mapeo constituida por 99 genotipos de hermanos completos segregantes y un mapa genético altamente denso basado en SNPs. La producción de yuca se ve afectada por diversas enfermedades, una de las más serias es la bacteriosis vascular (CBB) causada por Xanthomonas axonopodis pv. La yuca, Manihot esculenta Crantz, representa la principal fuente de alimento para cerca de 1000 millones de personas. Therefore there is a need for a proper management program to be deployed in managing the disease to enhance cassava production in the region. Kilifi County had a higher severity of 8% as compared to Taita Taveta which had 5% Severity. Kilifi County had the highest incidence of 22% with Taita Taveta having the lowest incidence of 13%. ![]() ![]() The study concluded that there is a widespread of cassava bacterial blight in Kilifi and Taita taveta counties. Out of the 70 samples collected, 40 of them were confirmed positive with X.pv manihotis and X.pv cassavae which cause cassava bacterial blight. During the survey, plant samples were randomly collected in the field. The main varieties found growing in the region were Tajirika, Karembo, Kibandameno, and Shibe which were all confirmed by farmers as susceptible to cassava bacterial blight. Among the 250 farmers interviewed, 61.6 % identified cassava bacterial blight symptoms in their farms. A survey was conducted involving 250 farmers who were randomly selected from two regions of Kilifi and Taita Taveta counties. This study was done to identify the prevalence, distribution, and farmers' knowledge of cassava bacterial blight in the coastal region of Kenya. ![]() Apart from other major viral diseaes Cassava mosaic and Cassava brown streak, Cassava bacterial blight (CBB) caused by Xanthomonas axonopodis pv manihotis and Xanthomonas axonopodis pv cassavae are a major constraint in cassava production in Kenya. Diseases remain one of the major constraints for cassava production. This work represents a contribution to the elucidation of the molecular bases of quantitative cassava resistance to Xam.Cassava (Manihot esculenta Crantz) is one of the staple food crops grown in Kenya. After a bioinformatics exploration four genes were identified in the QTL intervals. Through a non-parametric interval mapping analysis, two QTL were detected, explaining 10.9 and 12.6 % of phenotypic variance of resistance to field CBB. Both resistant and susceptible transgressive segregants were detected in the mapping population. The phenotypic evaluation was carried out in Puerto Lopez, Meta, Colombia, during the rainy season in 2015. A quantitative trait loci (QTL) analysis for CBB resistance was performed under natural infection conditions, using a mapping population of 99 full-sibs genotypes highly segregant and a SNP-based high dense genetic map. Cassava's production is affected by several diseases, one of the most serious is cassava bacterial blight (CBB) caused by Xanthomonas axonopodis pv. Cassava, Manihot esculenta Crantz, represents the main food source for more than one billion people. ![]()
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