Distribution of Pantoea ananatis on melon [Cucumis melo] plants
2010
Adachi, R., Kochi-ken. Agricultural Research Center, Nankoku (Japan) | Yano, K. | Takeuchi, S.
The bacterium Pantoea ananatis sometimes causes fruit rot of melon in commercial fields in Kochi Prefecture. We investigated its distribution and occurrence on fruits of melon plants. Pantoea ananatis was detected not only from rotting fruits but also internal tissues of healthy-looking roots, the basal part of stems, fruit-bearing branches, peduncles and upper stem parts. Pantoea ananatis was detected from both epidermal and internal tissues of melon plants during the flowering period. At harvesting the incidence of fruit rot depended on the P. ananatis detection rate during the flowering period. Pantoea ananatis was detected from internal tissues of the branch or leaf of melon plants bearing rotting fruits, but P. ananatis was also detected from stems of melon plants bearing healthy fruits. Pantoea ananatis was detected from internal tissues of seeds produced in rotting fruits. Pantoea ananatis invaded internal tissues of melon through contaminated sowing bed or infected seeds. Collectively, these findings indicate that P. ananatis might be a resident bacterium on melon without causing fruit rot. A factor such as saccharide content might be a trigger of the fruit rot signal transduction cascade.
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