Experimental and Applied Acarology (2014) 62, 57-65

Jan Hubert, Marta Nesvorna and Tomas Erban (2014)
Growth-suppressive effect of the α-amylase inhibitor of Triticum aestivum on stored-product mites varies by the species and type of diet
Experimental and Applied Acarology 62 (1), 57-65
Abstract: A naturally occurring α-amylase inhibitor (α-AI) of Triticum aestivum protects wheat grain from gramnivorous arthropod pests. The α-AI (Type-I) was incorporated into carbohydrate and protein diets to test its inhibitory activity on the stored-product mites Acarus siro, Lepidoglyphus destructor and Tyrophagus putrescentiae (Acari: Astigmata). Growth tests of mites fed the various diets were used to compare the suppressive effects. The final population size of mites attained from an initial population of 50 specimens maintained under controlled conditions (85 % relative humidity and 25 °C) was compared after 21 days of cultivation. The results showed that α-AI in the concentration in the range of 0.01-1 mg g^-1 did not suppress the growth of the tested stored-product mites. α-AI at a concentration of 10 mg g^-1 exerted a growth-suppressive effect that depended on the diet and species of the mites. The growth rate of A. siro was affected by the type of diet and was higher on carbohydrate diet than on the protein diet, the suppressive effect of α-AI was on the both diets. The growth-suppressive effect of α-AI on L. destructor and T. putrescentiae was significant when they were fed the protein diet but not when they were fed the carbohydrate diet. The higher resistance of tested mites to α-AI (proteinaceous) compared to non-proteinaceous acarbose corresponds to a powerful proteotolytic system in the mite gut. The results are discussed in terms of the adaptability of mites to utilize the starch from food sources.
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Link to article at publishers website
Database assignments for author(s): Jan Hubert, Tomas Erban

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tyrophagus putrescentiae	Wheat (Triticum)
	Tyrophagus putrescentiae	Stored grain
	Acarus siro	Wheat (Triticum)
	Acarus siro	Stored grain
	Lepidoglyphus destructor	Wheat (Triticum)
	Lepidoglyphus destructor	Stored grain