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Yibo Zhang,Nianwan Yang,JinjunWang,FanghaoWan 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.4
Parasitoid adults often acquire carbohydrates by feeding on floral nectar and honeydew which provides themwith energy and prolongs their life span. The concentration and type of saccharide in nectar and honeydew arevariable by species of plant and insect. To explore the effects of various sugar type and concentrations on parasitoidfitness, we compared 5%, 10% and 20% (w/v) solutions of six different sugar resources (glucose, fructose,sucrose, trehalose, melezitose and honey) on the longevity of Eretmocerus hayati, a larval parasitoid of thewhiteflyBemisia tabaci in China. Male and female longevity was increased by all of the sugar diets, but female waspssurvived longer than the males when the same sugar diet was supplied. Female parasitoids feeding on 10%glucose and 10% honey increased longevity, respectively up to 6.2- and 5.9-fold longer than distil water; 5%honey and 10% fructose had the greatest effects on male longevity, up to 3.5- and 3.3-fold. All six sugar diets,no matter which concentration, significantly changed the survival curves. Glucose, sucrose and honey wereoptimal sugar diets for this wasp, and 10% was the optimal concentration. Our results could provide an insightinto the nutritional requirements of E. hayati under laboratory conditions. Such information can be a basis toimprove the longevity of this biological control agent by sugar feeding during the indoor mass-rearing process.
Wen-Jia Yang,Kang-Kang Xu,Wei Dou,Can Li,JinjunWang 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.3
3-Hydroxy-3-methyl glutaryl coenzyme A reductase (HMGR) is an important rate-limiting enzyme in the mevalonate pathway, which is critical for the synthesis of juvenile hormone and insect development. In this study, a full-length cDNA encoding HMGR (BdHMGR) was cloned from the oriental fruit fly, Bactrocera dorsalis (Hendel). The open reading frame of BdHMGR encoded 928 amino acids and shared a high degree of identity with other known HMGRs. The expression levels of BdHMGR were high during the early and lately pupal stages, and were low at the larval and mid pupal stages. In the adult stages, the highest level of BdHMGR was detected on day-10 of the adult lifecycle, and the expression levels in females were greater than those in males. The highest tissuespecific expression was in the ovary, followed by fat body and other tissues. Injection of double-stranded RNA (dsRNA) of BdHMGR into adult females significantly reduced BdHMGR transcript levels, and inhibited ovarian development and affected the expression of two yolk protein genes. After dissection, we found that one or two of the spheroids of ovaries from the BdHMGR dsRNA-injected flies were amorphous and reduced in size as compared with the controls. The results suggest that BdHMGR is required for ovarian development in B. dorsalis and may be a potential target for pest control.