Introduction
Pseudomonas fluorescens Migula is an important plant growthpromoting
rhizobacterium (PGPR), which can promote plant
growth, increase yield and inhibit pathogen infection. Kloepper and
Schroth (1978) reported that certain root-colonizing bacteria could
promote growth, reduce soil pathogen infection and increase yield
of radish plants. Raupach et al. (1996) reported that two PGPRs,
which had been previously reported to be able to induce resistance
against fungal and bacterial diseases in cucumber were able to
induce TMV resistance in both cucumber and tomato. A number of
studies on tomato demonstrated that PGPR could trigger ‘induced
systemic resistance’ (ISR) against various viruses, including TMV,
cucumber mosaic virus (CMV) and tobacco leaf curl virus (TLCV)