Use of different strains of P. aeruginosa significantly(p<0.05) reduced infection of root-infecting fungi andenhanced plant growth. Mansoor et al., (2007) and severalother researchers have also observed the suppression ofroot fungi by P. aeruginosa. Root colonizing bacteria thathave a beneficial effect on plants have been reported toimprove plant growth either through direct stimulation ofthe plant, by producing growth regulators (Naveed et al.,2008), or suppressing the pathogens (Raaijmakers et al.,2002). Of the various rhizospheric bacteria, thosebelonging to the fluorescent Pseudomonas spp., whichcolonize roots of a wide range of crops are reported to beantagonistic to soil borne pathogens (Siddiqui et al.,2000). The production of certain antibiotics andsiderophores by P. aeruginosa has been regarded as oneof the mechanisms involved in this antagonism (Levy etal., 1992). Raaijmakers & Weller (1998) described therole of 2, 4-diacetylphloreglucinol, an antifungalmetabolite from species of fluorescent Pseudomonas inroot disease suppression. Van Peer et al., (1991) observedinduced resistance in carnation against Fusarium wilt by astrain of Pseudomonas sp.
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