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Rhamnolipids as Platform Molecules for Production of Potential Anti-zoospore Agrochemicals

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journal contribution
posted on 08.04.2015, 00:00 by Shida Miao, Soroosh Soltani Dashtbozorg, Nicholas V. Callow, Lu-Kwang Ju
Rhamnolipid biosurfactants have potential applications in the control of zoosporic plant pathogens. However, rhamnolipids have not been closely investigated for the anti-zoospore mechanism or for developing new anti-zoospore chemicals. In this study, RhL-1 and RhL-3 groups of rhamnolipids were used to generate the corresponding RhL-2 and RhL-4 groups and the free diacids. Conversion of RhL-3 to RhL-1 was also accomplished in vitro with cellobiase as the catalyst. The anti-zoospore effects of RhL-1–RhL-4 and the diacids were investigated with zoospores of Phytophthora sojae. For RhL-1–RhL-4, approximately 20, 30, 40, and 40 mg/L, respectively, were found to be the lowest concentrations required to stop movement of all zoospores, which indicates that the anti-zoospore effect remains strong even after RhL-1 and RhL-3 are hydrolyzed into RhL-2 and RhL-4. The free diacids required a significantly higher critical concentration of about 125 mg/L. Rhamnose can be obtained as a co-product.

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