Plant growth promoting fluorescent pseudomonad strains Pf1, TDK1 and
PY15 were evaluated for their efficacy against leaffolder (Cnaphalocrocis
medinalis) pest in rice plants under field conditions individually and in
combinations. Application of mixtures of Pseudomonas fluorescens strains
Pf1, TDK1 and PY15 significantly reduced the leaffolder damage in rice
plants compared with untreated control. Interestingly, natural enemy
population in plots treated with P. fluorescens was greater than the chemical
and untreated controls. Further, support for these results was gathered
by assaying activities of polyphenol oxidase (PPO) and
lipoxygenase (LOX) under glasshouse conditions. The results showed
the higher activity of PPO and LOX in plants treated with P. fluorescens
mixtures (Pf1 + TDK1 + PY15) than the plants treated with individual
strains, chemical and untreated controls. Further, fluorescent pseudomonad
mixtures increased the rice yield compared with individual strain
and non-bacterized treatments. The present study reveals that in addition
to plant growth promotion, plant growth-promoting rhizobacterial
(PGPR) strains-mediated induction of PPO and LOX in rice plants could
be involved in enhanced natural enemy populations and resistance
mechanisms against leaffolder attack.
Plant growth promoting fluorescent pseudomonad strains Pf1, TDK1 andPY15 were evaluated for their efficacy against leaffolder (Cnaphalocrocismedinalis) pest in rice plants under field conditions individually and incombinations. Application of mixtures of Pseudomonas fluorescens strainsPf1, TDK1 and PY15 significantly reduced the leaffolder damage in riceplants compared with untreated control. Interestingly, natural enemypopulation in plots treated with P. fluorescens was greater than the chemicaland untreated controls. Further, support for these results was gatheredby assaying activities of polyphenol oxidase (PPO) andlipoxygenase (LOX) under glasshouse conditions. The results showedthe higher activity of PPO and LOX in plants treated with P. fluorescensmixtures (Pf1 + TDK1 + PY15) than the plants treated with individualstrains, chemical and untreated controls. Further, fluorescent pseudomonadmixtures increased the rice yield compared with individual strainand non-bacterized treatments. The present study reveals that in additionto plant growth promotion, plant growth-promoting rhizobacterial(PGPR) strains-mediated induction of PPO and LOX in rice plants couldbe involved in enhanced natural enemy populations and resistancemechanisms against leaffolder attack.
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