Abstract
Metschnikowia pulcherrima occurs naturally on fruits, buds and floral parts of apple trees. Some strains are effective as biocontrol agents against postharvest decay of apples and other fruits. The usefulness of the amplified fragment length polymorphism (AFLP) technique was evaluated for the genetic analysis of 26 strains of M. pulcherrima, isolated from different sources in different geographical regions. With six AFLP primer pairs, 729 polymorphic bands were scored. The technique showed a high discriminatory power. Genetic relationships between strains were also estimated using AFLP. All the isolates from the carposphere of apple, previously tested as biocontrol agents, were grouped in a single cluster with a high bootstrap value (97), indicating robustness and reproducibility. AFLP patterns could clearly distinguish the different strains and research is in progress to use some putative specific bands for single tag sequence (STS) conversion to develop isolate-specific markers.
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