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Isolation, characterization, and expression of a second beta-tubulin-encoding gene from Colletotrichum gloeosporioides f. sp. aeschynomene

Colletotrichum gloeosporioides f. sp. aeschynomene is a fungal plant pathogen of Aeschynomene virginica. A beta-tubulin-encoding gene (TUB2) from this pathogen was cloned and sequenced. The deduced amino acid sequence of TUB2 had a high degree of homology to other fungal beta-tubulins. A portion of TUB2 from a benomyl-resistant C. gloeosporioides f. sp. aeschynomene mutant was also cloned and sequenced. A point mutation resulting in a glutamic acid-to-lysine substitution at amino acid 198 likely confers benomyl resistance. The mutation is relevant for use as a selectable marker in developing a gene transfer system in C. gloeosporioides f. sp. aeschynomene. Northern (RNA) hybridizations with C. gloeosporioides f. sp. aeschynomene TUB2 and another C. gloeosporioides f. sp. aeschynomene beta-tubulin-encoding gene (TUB1) as probes showed differential expression of these genes in different cell types.