IJFANS International Journal of Food and Nutritional Sciences

ISSN PRINT 2319 1775 Online 2320-7876

Phytochemical analysis of chilli leaves in response to Chilli mite, Polyphagotarsonemus latus (Banks) infestation

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Monika Jangra, Rachna Gulati, Sonika Khatak, Asha Poonia

Abstract

Chilli (Capsicum annuum L.) (Family: Solanaceae) is one of the important spice crops of India and is being widely cultivated throughout warm temperate, tropical and subtropical countries. The broad mite, Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae), is a serious pest of chilli crop. During study it was observed that, NPK content of chilli leaves showed a significant decline with increase in P. latus infestation. With increase in P. latus population from 8.91 to 22.08 mites/leaf, nitrogen, phosphorus and potassium content in chilli leaves dropped from 6.62 to 1.12% dry weight, 0.48 to 0.14% dry weight and 4.75 to 1.50% dry weight, respectively. Phenolic compounds exhibited a marked increase from 0.35 to 0.54% dry weight with increase in mite infestation. Total phenols were 0.35 % dry weight in least susceptible hybrid (9/CHIhyb-10) as compared to 0.54 % dry weight in highly susceptible hybrid (10/CHIhyb-7). In uninfested leaves, total sugar content was 1.34 mg/g fresh weight which decreased significantly to 0.50 mg/g fresh weight with increase in P. latus infestation (22.08 mites/leaf). The reducing sugar content was found to be significantly increased from 0.24 mg/g fresh weight in uninfested leaf to 0.48 mg/g fresh weight in highly susceptible hybrid (10/CHIhyb-7). Mites use carbohydrates as feeding stimulants and promote ovipositions. These nutrients needed to synthesize body tissue and serve as energy sources. A significant effect of mite incidence depicted a progressive decline in non-reducing sugars in accordance with increase in P. latus infestation as compared to uninfested plant.

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