Caccalano, M. N.
Zamuner, C. F. C.
Domingues, D. S.
Total Authors: 5
 Sao Paulo State Univ UNESP, Dept Gen & Appl Biol, 8 Av 24A, 1515 Bela Vista, BR-13506900 Rio Claro, SP - Brazil
 Sao Paulo State Univ UNESP, Dept Biodivers, Rio Claro - Brazil
Total Affiliations: 2
Journal of Applied Microbiology;
Web of Science Citations:
Aims The aim of the study is to evaluate hexanoic acid (HA) as an alternative to manage citrus canker. Methods and Results The minimal growth inhibitory concentration of HA against Xanthomonas citri subsp. citri was determined at 2 center dot 15 mmol l(-1) using a respiratory activity assay. Growth curves at different pH values showed that growth inhibition was not due to media acidification induced by HA. The germination rate and root elongation of Lactuca sativa seeds exposed to different concentrations of HA (varying from 0 center dot 86 to 5 center dot 16 mmol l(-1)) were assessed to screen for phytotoxicity. The acid exhibited low phytotoxicity for L. sativa at 1 center dot 29 and 2 center dot 58 mmol l(-1). To evaluate the ability of HA to protect citrus against X. citri infection, leaves of Citrus sinensis were sprayed with the acid and subsequently challenged with X. citri. HA at 3 center dot 44 mmol l(-1) was able to protect citrus against infection, showing a reduction of three orders of magnitude in the number of citrus canker lesions per cm(2) when compared to the untreated negative control. Conclusion HA is a potential alternative to copper for citrus canker management. Significance and Impact of the Study HA inhibits X. citri growth, exhibits low phytotoxicity and is an alternative to copper for the protection of citrus plants against bacterial infection. (AU)