Abstract
UPD-glucose transferases are found in the cytosolic and microsomal fractions of the grain aphidSitobion avenae F. Gel filtration and SDSPAGE revealed that the microsomal fraction contained several forms of the enzyme. The molecular weights of the three most active fractions might be 68,000, 66,000, and 36,500. There was a negative correlation between the enzymes' activity in extracts of aphids and the concentration of DIMBOAaglucone in the winter wheat variety fed on by the aphid. A strong inhibition of the activity of the UPD-glucose transferases was observedin vitro at a concentration of DIMBOA as low as 0.01 mM. There was a greater activity of the enzymes in aphids fed on seedlings of susceptible than on moderately resistant wheat cultivars. Prolonged feeding on resistant cultivars resulted in a further reduction in the activity of the aphid's enzymes. The significance for cereal aphids of the role of their UDP-glucose tranferases in the detoxification of plant allelochemicals and adaptation to resistant varieties of cereals is discussed.
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Leszczynski, B., Matok, H. & Dixon, A.F.G. Resistance of cereals to aphids: The interaction between hydroxamic acids and UDP-glucose transferases in the aphidSitobion avenue (Homoptera: Aphididae). J Chem Ecol 18, 1189–1200 (1992). https://doi.org/10.1007/BF00980073
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DOI: https://doi.org/10.1007/BF00980073