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Trehalase invertase and amylase activities in the black scale saissetia oleae and their relation to host adaptability


, : Trehalase invertase and amylase activities in the black scale saissetia oleae and their relation to host adaptability. Journal of Insect Physiology 22(7): 1025-1029

In young females of the black scale S. oleae, the optimum conditions for invertase activity involve a reaction mixture of pH 5.5 and 2% sucrose at 37.degree. C for 60 min; for amylase, pH 6.0 and 0.5% starch at 37.degree. C for 45 min; and for trehalase, pH 5.5 and 1.5% trehalose at 37.degree. C for 60 min. At optimal conditions and using standard enzyme activity units, invertase and trehalase activities were much higher (.apprx. 8-fold) than that of amylase, indicating the importance of these enzymes in food digestion and energy supply. The enzyme activities were strongly affected by various host plants. Trehalase activity in scales reared on potato sprouts was .apprx. 3.5 and 4-fold that obtained in scales reared on oleander and citrus plants, respectively. An increase of .apprx. 40% for invertase and 60% for amylase activity was obtained in scales reared on potato sprouts as compared with those reared on oleander or citrus. A good correlation was observed between enzyme activity, especially of trehalase, and scale development. The duration of 1 generation of the black scale reared on potato sprouts was 2.5-3 mo., on oleander 4-5 mo., and on citrus 6 mon. Trehalase and to some extent invertase could probably be used as parameters to assess the adaptability of the black scale to its host plant.

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Accession: 006839067

DOI: 10.1016/0022-1910(76)90087-1

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