Abstract
The diverse feeding habits of Rhynocoris marginatus make the Reduviidae ideal for studies of feeding strategies, including digestive enzyme composition. Wide ranges of digestive enzymes were recorded in the alimentary canal of insects, and their level varies in relation to diet. Digestive enzymes play a major role in insect physiology by converting complex food materials into micromolecules necessary to provide energy and metabolites for growth, development, and other vital functions. These enzymes are produced and distributed in various regions of the gut and salivary gland in different proportions and quantities. It is hypothesized macromolecules in the prey dramatically influence reduviid growth and development mediated through qualitative and quantitative regulation of digestive enzymes. The attempt was made to study the quantitative profile of digestive enzymes in relation to different preys and oligidic diet-reared predator. Rhynocoris marginatus foregut and hindgut contain amylase, protease, invertase, and lipase. Amylase, invertase, and lipase activities of both the foregut and hindgut were high, while R. marginatus was fed with Corcyra cephalonica followed by artificial diet and Spodoptera litura. The hindgut enzyme activities were decreased (++), and similar kinds of observations were recorded for artificial diet and Spodoptera litura. The results show that generally prey type and artificial diet do not have any influence on the enzyme qualitative profile of this reduviid. In salivary gland, all the enzyme activities were moderate (++) except lipase (+) when Corcyra cephalonica and Spodoptera litura provided food. The activity was reduced (+) on Corcyra cephalonica and artificial diet for Rhynocoris marginatus. Results clearly show provision of artificial diet has not changed the enzyme levels in the foregut and midgut of this predator.
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Sahayaraj, K., Balasubramanian, R. (2016). Gut Enzyme Profile. In: Artificial Rearing of Reduviid Predators for Pest Management . Springer, Singapore. https://doi.org/10.1007/978-981-10-2522-8_5
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