Biochemical study of scent glands of Coridius janus (Heteroptera : Pentatomidae )
Keywords:
Coridius janus, metathoracic scent gland, abdominal scent gland, Glycogen, Glucose, Lactate, Pyruvate, Total protein, Free amino acidsAbstract
Insects of many varieties have developed various modes of chemical and behavioral defensive mechanisms. When disturbed, many hemipterans release a pungent and volatile fluid with an offensive odour. These secretions may be used by the bugs as defensive substances. In the present investigation, chemical composition of the scent secretion of larval abdominal scent glands and metathoracic scent glands of adults, estimations of glycogen, glucose, lactate, pyruvate, total proteins and free amino acids contents of scent glands of larvae and adults, have been studied. The both larvae and adults of C. janus contained eight predominant amino acids identified by paper chromatography, namely glutamic acid, proline, tyrosine, histidine, aspertic acid, alanine, cystine and ornithine. The parameters of substrates showed higher values of glucose, lactate in the metathoracic scent glands of adults bugs, while the glycogen, pyruvate, total proteins, free amino acids are higher in the abdominal scent glands of larvae of C. janus.
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