Cultivation and Genome Sequencing of Bacteria Isolated From the Coffee Berry Borer (), With Emphasis on the Role of Caffeine Degradation
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The coffee berry borer, the most economically important insect pest of coffee worldwide, is the only insect capable of feeding and reproducing solely on the coffee seed, a food source containing the purine alkaloid caffeine. Twenty-one bacterial species associated with coffee berry borers from Hawai'i, Mexico, or a laboratory colony in Maryland ( sp. S40, S54, S55, , , sp. S38, S43, S63, , sp. S45, S46, sp. S61, , , and sp. S30, S31, S32, S37, S44, S60, S75) were found to have at least one of five caffeine N-demethylation genes (, , , , ), with spp. S31, S32, S37, S60 and . having the full complement of these genes. Some of the bacteria carrying the ndm genes were detected in eggs, suggesting possible vertical transmission, while presence of caffeine-degrading bacteria in frass, e.g., () and () could result in horizontal transmission to all insect life stages. Thirty-five bacterial species associated with the insect ( sp. S40, S54, S55, , group, sp. S29, S70, S71, S72, S73, , sp. S38, S43, S59, S63, , , sp. S45, S46, sp. S28, sp. S61, S62, , , sp. S30, S31, S32, S37, S44, S60, S75, sp. S39, S41, S48, S49) might contribute to caffeine breakdown using the C-8 oxidation pathway, based on presence of genes required for this pathway. It is possible that caffeine-degrading bacteria associated with the coffee berry borer originated as epiphytes and endophytes in the coffee plant microbiota.
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