Phytochemistry p. 791 - 794 (1984)
Update date:2022-08-31
Topics:
Mitchell, Robin E.
Chlorosis-inducing compounds in liquid cultures of the phytopathogenic bacterium Pseudomonas syringae pv. atropurpurea have been investigated.In addition to coronatine as previously reported, a new compound was discovered.This give a mass-spectral fragmentation pattern which indicated that it was, like coronatine, an amide of coronafacic acid.Acid-hydrolysis of the new toxin liberated the amino acid valine.This observation, together with mass spectral and MNR data, established the structure of the new toxin as N-coronafacoylvaline.Some implications to biosynthesis are discussed.Along with the two chlorosis-inducing compounds, the biologically inactive coronafacic acid was also isolated from the growth medium.Key Word Index - Pseudomonas syringae pv. atropurpurea; toxin; leaf chlorosis; coronatine; N-coronafacoylvaline; coronafacic acid.
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