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A pot study was aimed to investigate the role of tomato
in determining differential response to bacterial wilt causal agent
Ralstonia solanacearum pathogen and arbuscular mycorrhizal fungi (AMF)
Glomus mosseae. Disease severity was measured after 10, 20 and
30 days of plant growth. The pathogen and dual treatment (R. solanacearum
with G. mosseae) were not significantly different at the end of
this experiment. Soil pH was greatly influencing the pathogen and AMF
microbe. Glomus mosseae mycorrhizosphere was more alkaline (pH
5.9) compared to the pathogen mycorrhizosphere (pH 4.9). The concentration
of bacterial cell in the R. solancearum soil was not different
from the dual treatment after 60 days of plant growth. Spore germination
was influenced by the interaction between the soil pathogen and AMF. Spores
number in the dual treatment at 60 days was less than the original number
added. Root colonization percentage in G. mosseae (61%) was significantly
more than the dual treatment (16%). This provide an evidence about the
role of plant host in increasing the spores germination influenced by
many substances produced by the host root (root exudates). The results
demonstrated that the role of plant in determination the relationship
between soil-borne pathogen and antagonistic microbe was critical.
