Abstract
ABSTRACT Casuarinas have been used for paper and pulp, and many Casuarina clonal plantations were made in India. Two actinobacteria, Frankia and Micromonospora, colonize in root nodules of Casuarinas and improve the growth of their host plants as a symbiotic nitrogen fixer and a biocontrol agent against Ralstonia solanacerum, a wilt desease bacteria damaging young clonal plantations, respectively. In the present study, antimicrobial activity of Micromonospora against Ralstonia solanacearum was examined. Then, effects of Frankia and Micromonospora on the growth and nitrogen content in Casuarina hybrid clones were examined in the greenhouse. The biocontrol activity of Micromonospora against a bacterial wilt was also evaluated in Casuarina plantations. The results showed that Micromonospora suppressed the growth of R. solanacearum under laboratory conditions and that the growth of Casuarina clones was improved by the addition of cultured Frankia and/or Micromonospora. The bacterial wilt in Casuarina clonal plantations might be suppressed due to the biocontrol activity of Micromonospora.
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