Estimation of genetic variation and relationship in potato (Solanum Tuberosum L.) cultivars using AFLP markers
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Abstract
Amplified fragment length polymorphism (AFLP) markers were used to distinguish commercial cultivars and to assess the level of polymorphism in potato. AFLP analysis templates were made using Eco RI and Mse I as described in the Gibco BRL AFLP kit protocol. Seven primer combinations with three selective nucleotides on both primers were screened individually with 12 potato cultivars. Multiple polymorphisms could be detected in a single reaction to the extent that all 12 commercial potatoes tested could be distinguished using any one primer combination. Up to 84 polymorphic bands were detected with a single primer combination among 12 accessions. The seven primer combinations generated a total of 466 bands, of which 409 (88%) were clearly polymorphic among the cultivars. The presence or absence of each AFLP markers was scored and then phylogenetic and genetic distance analyses were used to generate dendrograms showing genetic relationships among the cultivars evaluated. The analyses based on amplified DNA fragments did not always reflect the known genetic relationships among the cultivars. These results demonstrate that AFLP DNA markers can be of great value in identification and measurement of variation, but should be treated with caution for purposes of estimating true measures of genetic similarity in potato.
Additional key words
Potato AFLP identification relationships fingerprintingResumen
Marcadores del polimorfismo en la longitud de los fragmentos amplificados (AFLP) fueron empleados para distinguir los cultivares comerciales y para evaluar el nivel de polimorfismo en la papa. Se hicieron los modelos de análisis de AFLP usando Eco RI y Mse I como se describen en el kit de protocolo de AFLP de Gibco BRL. Las siete combinaciones de iniciadores con très nucleótidos selectivos en ambos iniciadores fueron evaluadas en forma individual con 12 cultivares de papa. Se pudieron detectar polimorfismos múltiples en una sola reacción hasta el punto que las 12 papas comerciales analizadas pudieron distinguirse empleando cualquier combinación única de iniciadores. Se detectaron hasta 84 bandas polimórficas con una sola combinación de iniciadores entre las doce entradas. Las siete combinaciones de iniciadores generaron un total de 466 bandas, de las cuales 409 (88%) fueron claramente polimórficas entre los cultivares. Se midió la presencia o ausencia de cada marcador de AFLP y se emplearon los análisis filogeneticos y de distancia genética para generar dendrogramas que mostraran his relaciones genéticas entre los cultivares evaluados. El análisis basado en fragmentos de ADN amplificados no siempre reflejó las relaciones genéticas conocidas entre los cultivares. Estos resultados demuestran que los marcadores de ADN del AFLP pueden tener un gran valor en la identificación y medida de la variatión pero deberían usarse con cautela para estimar las medidas reaies de la similitud genética en la papa.
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