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|Title: ||Oxidative responses of Chayote, Sechium edule (jacq.) and Bitter gourd, Momordica charantia l. as determinants of host plant resistance to infestation by melon fly, Bactrocera cucurbitae (coquillett).|
|Authors: ||Seshadri, Shivashankar|
N K, Krishna Kumar
H R, Ranganath
host plant resistance
|Issue Date: ||2010|
|Citation: ||Seshadri Shivashankar, Manoharan Sumathi, Nallur Kodandaraman Krishna Kumar and Hassan R. Ranganath. 2010. Oxidative responses of Chayote, Sechium edule (jacq.) and Bitter gourd, Momordica charantia l. as determinants of host plant resistance to infestation by melon fly, Bactrocera cucurbitae (coquillett). J. Chemical Ecology|
|Abstract: ||The present study indicated the inability of melon fly (Bactrocera cucurbitae) larvae to complete its development on chayote, Sechium edule (Jacq.), though oviposition was extensive on fruits. This was in contrast to successful larval development observed on all other cucurbits examined. Freshly hatched, first instar larva from chayote when given access to selected cucurbits ( bitter gourd, Momordica charantiaL, cucumber (Cucumis sativa), ridge gourd (Luffa acutangula), bottle gourd(Lagenaria siceraria), chayote (Scechium edule) developed successfully into adults. The mechanism of resistance to larval development in chayote was clearly antibiosis and not antixenosis to oviposition by adults. The potential role of antioxidative enzymes, ROS and secondary metabolites were investigated in bitter gourd (Momordica charantia L), a species highly susceptible to melon fly infestation and compared with the responses of melon fly resistant chayote. The activities of peroxidase, polyphenol oxidase and superoxide dimutase were significantly higher following infestation in chayote as compared to bitter gourd. The levels of antioxidants also followed a similar trend. The changes in ROS showed distinct differences in the pattern of response between bitter gourd and chayote. The analysis of data indicated that the production of a significantly higher level of hydroxyl radical in bitter gourd is the most crucial factor determining its susceptibility to melon fly infestation owing to its highly destructive effects. The melon fly resistant chayote maintained an excellent balance between free radical production and the scavenging reactions. A concerted action of antioxidative enzymes in chayote was the primary factor contributing to resistance to melon fly in chayote. The significance of these findings in the management of melon fly is discussed.|
|Appears in Collections:||Entomology & Nematology|
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