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AbstractPhenylpropanoid pathway enzymes are involved in plant defence pathwaysleading to lignification, synthesis of secondary metabolites, such assalicylic acid and phytoalexins, wound healing and the oxidative burst.Endophytic non-pathogenic Fusarium oxysporum isolate V5w2 has been reportedto show antagonistic effects against Radopholus similis in the screenhouse.An experiment was designed to study root biochemical changes (PAL, POX andPPO activities) and R. similis numbers in susceptible and tolerant bananasfollowing inoculation with isolate V5w2. Constitutive expression of PAL andPPO were similar between the susceptible and tolerant cultivars, whileconstitutive POX activity was higher in the tolerant cultivar. PAL activitywas suppressed in both cultivars 7 days after endophyte inoculation (7 dai),but was significantly up-regulated in the susceptible cv. Nabusa at 30 dayspost nematode challenge (dpnc) in endophyte-inoculated plants. In thetolerant cultivar, PAL activity was up-regulated in R. similis-challengedplants at 7 and 30 dpnc, irrespective of endophyte inoculation. POX and PPOwere transiently up-regulated in cv. Nabusa 7 dai, exceeding levels observedin non-inoculated plants of the same cultivar. POX activity was up-regulatedat 7 dpnc in endophyte-inoculated cv. Nabusa plants challenged with R.similis. In the tolerant cultivar, POX and PPO activities were similarlyup-regulated in R. similis-challenged plants at 7 dpnc, irrespective ofendophyte inoculation. The findings of this study implicate PAL, POX and PPOin banana defence against the root-burrowing nematode R. similis. Ourfindings further demonstrate the ability of endophytic F. oxysporum isolateV5w2 directly to induce POX and prime PAL in the susceptible cv. Nabusa forgreater up-regulation following R. similis challenge.
Nematology – Brill
Published: Jan 1, 2010
Keywords: RESISTANCE; PLANT DEFENCE; PLANT-PARASITIC NEMATODE; ROOT-BURROWING NEMATODE; POX; PPO; PAL
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