Trichoderma asperellum SKT-1 and
Gibberella fujikuroi, known as causal agents of “Bakanae” disease, were both transformed with genes encoding green fluorescent protein (GFP) and hygromycin B (hygB) by restriction enzyme- mediated integration (REMI). Rice seeds inoculated with GFP-tagged
G. fujikuroi showed “Bakanae” symptoms. GFP-tagged SKT-1 maintained biocontrol activity against the pathogen by soaking seeds in SKT-1 spore suspension. Then, we monitored
in situ interactions between SKT-1 and
G. fujikuroi on rice seeds using GFP-tagged transformations under confocal scanning laser stereomicroscopy.
G. fujikuroi disappeared from the embryo of rice seeds after treatment with SKT-1, whereas SKT-1 was observed on the embryo 24 hr after initiation of germination. In addition, the hyphae of
G. fujikuroi were penetrated by the hyphae of SKT-1, and degradation of the cell walls of
G. fujikuroi was observed under SEM in co-culture. The cell wall of
G. fujikuroi on the embryo of rice seeds was lysed, suggesting that mycoparasitism is the mode of action of
T. asperellum SKT-1.
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