Oxidative enzymes in coconut cultivars in response to Raoiella indica feeding

Description: The increase in oxidative enzyme activities is related to dlminished mite Infestation. Some biol?gica! aspects of Raoiella indica Hirst reared on the coconut cultivars ('Jamaican Tall' (JT), 'Malayan Yellow Dwarf (MYD), Nlu Leka (NL) and a hybrid JT x MYD) were studied under laboratory conditions. Aditlonally, changes in oxidative enzyme activities (peroxidase and polyphenol oxidase) as response to R. indica feeding were studied in the cultivars where red palm mites showed h?ghest and lowest biol?gica! parameters val?es. Longer time spans and lower oviposition rates observed on the JT suggest this cultivar to be more resistant to R. indica feeding. Cultivar JT showed the highest valu? in PPO/POX ratio, being about twice the valu? shown by MYD in the infested piante. The observed enzyme act?vity ratios in both genotypes showed a silght increase 24 h after mite infestation, suggesting these enzymes could be related to plant resistance to R. indica. However, th?s relationship is stiii unciear. The biologicai parameters of R. indica together with higher enzyme activity, particularly on JT suggest this cultivar could be considered as a more resistant cultivar as compared to MYD. More detailed studies are required to determine the effect of these enzymes on coconut resistance to red palm mites.
http://www.academicjournals.org/journal/AJB/article-full-text-pdf/B1466AA60114

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