Abstract
A simple defined solid medium containing citrate and succinate, three amino acids (L-glutamine, L-asparagine, and L-cysteine), hemin chloride, potato starch, gellan gum (GelRite), and mineral salts supported the growth of grape strains of Xylella fastidiosa, the bacterial pathogen that causes Pierce's disease of grape. Isolation efficiency from infected grape plant samples, determined by the number of colony forming units recovered, on the defined medium was slightly less ( approximately 10-fold) or indistinguishable from two standard rich media used for culturing X. fastidiosa, PWG and PD3, respectively. The bacterium also grew on media with citrate and L-glutamine as the only carbon and nitrogen sources. Potato starch was not essential for bacterial growth, but no growth was observed on media without hemin chloride. Agar inhibited bacterial growth when used as the gelling agent.
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