![]() ![]() In Colombia, Departments such as Bolívar, Córdoba, Sucre, Magdalena and Meta are those with the largest cassava planted area and production. ![]() Colombia was ranked fifteenth in world cassava production and third in Latin America after Brazil and Paraguay (Aguilera, 2012). Due to the high adaptability to drought and acid and poor soils, cassava has been considered as an excellent alternative for an eventual world food crisis (FAO, 2008 FAO, 2013).īrazil, Thailand, Indonesia, Angola and Ghana are the countries with the largest cassava planted area. Cassava has been considered essential in protecting food security, especially for developing countries in Africa, Asia and Latin America (FAO, 2008). It is the third most important source of calories in the tropics, after rice and maize (FAO, 2008). Cassava is one of the most important crops worldwide. The cassava diploid genome is 2n = 36 and has sexual reproduction but for agro-economical purposes farmers use vegetative propagation (Carvalho and War, 2002 Raji et al., 2009). It is a perennial shrub and its origin is the Amazon Basin (Olsen and Schaal, 1999). Palabras clave: marcador molecular, QTL, resistencia, SNPs, Xanthomonas axonopodis pv manihotis, yuca.Ĭassava, Manihot esculenta Crantz, is a cross-pollinated species and belongs to the Euphorbiaceae family. Este trabajo representa un esfuerzo por dilucidar los mecanismos moleculares implicados en la resistencia de yuca a CBB. 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. Keywords: CassavaCassava,molecular markermolecular marker,QTLQTL,resistanceresistance,SNPsSNPs,Xanthomonas axonopodis pv manihotis.Xanthomonas axonopodis pv manihotis. This work represents a contribution to the elucidation of the molecular bases of quantitative cassava resistance to Xam. 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 López, 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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