Abstract
The faculty to produce fusaric acid in culture which is toxic to plant living cell was investigated to continue to the writer's work reported previously, by using the 79 strains belonging to 8 species of the genus Fusarium, classified by Snyder-Hansen's nomenclature, and, additionally, the 15 strains of Fusarium-neighbouring (Nectria, Epicoccum) and other wilting fungi (Cephalosporium, Verticillium).
It was more verified that all the strains used belonging to the species Oxysporum and Moniliforme had the faculty to produce fusaric acid, without exception. And this biochemical facts was distinctly separate the strains belonging to the both species from those bolonging to the other six species in the genus Fusarium, Fusarium-neighbouring and other wilting fungi, employed in the present experiment.
The experimental results obtained above provided an opportunity for thinking the following two kinds of problems. First, the application of investigating the faculty to produce such specific metabolite as fusaric acid in culture will probably help in the species judgement of Fusaria, as a new attempt of comparative biochemical classification technique for micro-organisms. Second, it may give an interesting problem in the study of pathological wilting in plant that Fusaria belonging to the both species noted above, produce fusaric acid and then cause a systemic fusariose as wilting or damping off of host plant. But, in a comparison of the pathogenicity of a limited number of isolated strains, the most pathogenic was not necessarily the most fusaric acid-productive. Other more complex factors are involved in pathogenicity.