Integration of Chitin-Degrading Microbes into Biological Control System for Fusarium Wilt of Strawberry
It has been known that an amendment of chitin to soil leads to an increase in the population of chitinolytic microbes and a decrease in the population of soilborne fungal plant pathogens (Boller, 1986; Mitchell and Alexander, 1962). This phenomenon has been applied with some successes to microbial control disease (Sneh et al., 1971; Sneh, 1981). In combination with a chitin-degrading microorganisms (Streptomyces sp.)and a root-colonizing antagonistic bacterium (Serratia marcescens), we successfully protected tomato plants from Fusarium wilt (Toyoda et al., submitted). In our system, an amendment of chitin to soils was essential for promoting preferential multiplication of chitin-degrading microorganisms and subsequent growth of antagonistic rhizoplane bacteria. These previous studies suggested that the pathogen could be effectively suppressed by the use of chitin-degrading microorganisms with antifungal activities, and that this system sould be practically used for the reduction of inoculum potential of pathogens in infested soils, provided the growth of these antagonists was promoted preferentially.
KeywordsFusarium Oxysporum Alginate Bead Fusarium Wilt Serratia Marcescens Rhizoctonia Solani
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