Effects of Scleroderma sichuanensis Xiao (Hymenoptera: Bethylidae) venom and parasitism on nutritional content regulation in host Tenebrio molitor L. (Coleoptera: Tenebrionidae)
نویسندگان
چکیده
To explore the mechanisms by which the wasp Scleroderma sichuanensis Xiao regulates the physiology and biochemistry of its host, effects of S. sichuanensis venom and parasitism on host the Tenebrio molitor L. pupae were examined. Significant differences in nutritional content were noted between parasitized and non-parasitized pupae and between venom- and phosphate buffered saline-injected pupae. When pupae were injected with venom, the fat body could not be disintegrated into granules; however, when pupae were parasitized, fat-body disintegration occurred. Electrophoresis showed no differences in hemolymph protein content between parasitized pupae and those injected with venom, indicating that the wasp did not have narrow-spectrum peptides. These findings confirmed that S. sichuanensis was a typical idiobiont ectoparasitoid wasp, and that nutrient regulation was similar between idiobiont and koinobiont wasps. The strong similarities between the two treatments suggest that venom injection is a major factor responsible for changes in host nutrient content. The wasp fed mainly on reducing sugars, free amino acids, and fat-body tissues; larval fat bodies were derived from hemolymph and from host tissue. Our findings suggest that lipid catabolism might be accelerated, and that lipid biosynthesis might be inhibited, when host pupae are parasitized or injected with venom. In addition to venom, physiological and biochemical changes that occur during the parasitic process might be caused by venom, ovarian proteins, saliva, or secretions.
منابع مشابه
نقش حشرات در جیره ی غذایی آبزیان: مطالعه موردی سوسک زرد آرد (میلورم) Tenebrio molitor L. (Coleoptera: Tenebrionidae)
حشرات فراوان ترین موجودات شناخته شده می باشند. 5 درصد آنها آبزی بوده و نقش مهمی را در شبکه های غذایی زیستگاه های آبی بازی می کنند. سوسک زرد آرد یکیازمعدود حشراتی در دسترسی است از ویژگی های کم نظیری مانند پرورش انبوه ارزان، چرخه زندگی کوتاه، سازگار با محیط زیست و همخوانیترکیبات تشکیل دهنده ی با نیاز های ماهی برخوردار است. لارو زنده وخشک آن به ترتیب دارای بیش از 50 و 20 درصد پروتئین می باشند و اس...
متن کاملEffects of Brewer’s spent grain (BSG) on larval growth of mealworms, Tenebrio molitor (Coleoptera: Tenebrionidae)
متن کامل
Transcriptomic Immune Response of Tenebrio molitor Pupae to Parasitization by Scleroderma guani
BACKGROUND Host and parasitoid interaction is one of the most fascinating relationships of insects, which is currently receiving an increasing interest. Understanding the mechanisms evolved by the parasitoids to evade or suppress the host immune system is important for dissecting this interaction, while it was still poorly known. In order to gain insight into the immune response of Tenebrio mol...
متن کاملSelf-selection of two diet components by Tenebrio molitor (Coleoptera: Tenebrionidae) larvae and its impact on fitness.
We studied the ability of Tenebrio molitor L. (Coleoptera: Tenebrionidae) to self-select optimal ratios of two dietary components to approach nutritional balance and maximum fitness. Relative consumption of wheat bran and dry potato flakes was determined among larvae feeding on four different ratios of these components (10, 20, 30, and 40% potato). Groups of early instars were provided with a ...
متن کاملThe response of Gregarina niphandrodes (Apicomplexa: Eugregarinida: Septatina) to host starvation in Tenebrio molitor (Coleoptera: Tenebrionidae) adults.
Numerous studies of host starvation have emphasized pathological effects of parasites on their insect host, but little attention has been focused on the effects of host starvation on the parasites. This study addressed the possibility that parasite life-cycle events could be manipulated by withholding food from the host. The system used was Gregarina niphandrodes (Apicomplexa: Eugregarinida) in...
متن کامل