Changes in Zucchini defense responses against Meloidogyne javanica (Rhabditida: Meloidogynidae) induced by Pochonia chlamydosporia

Abstract : 

Meloidogyne javanica causes serious damage to many crops and its management is not easily achievable. Pochonia chlamydosporia var. chlamydosporia (Pcc) is a potent biocontrol agent whose ability in stimulating plant defense has been ambiguous. This study was designed to analyze the kinetics of some defense-related enzymes in the roots of zucchini plants after inoculation with either one or both of Pcc and M. javanica. Activity of phenylalanine ammonia-lyase (PAL), peroxidase (POX), polyphenol oxidase (PPO), and catalase (CAT) in root samples were examined in a week with one day interval beginning from the next day following inoculation with M. javanica. When the plants were inoculated with both Pcc and nematode, the activity of PAL, POX and CAT was significantly improved during the experiment compared with other treatments. The PPO activity in such plants was more than PPO activity in nematode-infected plants only on the 5th and 7th day after inoculation. Individual application of Pcc frequently resulted in enhanced activity of PAL, POX and CAT compared with these enzymes activity in control treatment. This is the first report on the ability of Pochonia chlamydosporia var. chlamydosporia for inducing or improving the plant innate defense

Keyword : 

Catalase, nematophagous fungi, peroxidase, phenylalanine ammonia lyase, plant defense induction, polyphenol oxidase, root-knot nematode

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