Fig. 3. Pink disease color reaction in pineapple juice that promoted the growth of wild-type P. citrea (third tube from left) and mutant strains defective in their ability to convert glucose into 2,5-diketogluconate (tubes 4, 5, and 6 from left). Tubes 1 and 2 are plain juice and juice containing heat-killed P. citrea as the inoculum.

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