Biological and physiological effects of pyriproxyfen insecticide and amino acid glycine on silkworm, Bombyx mori L
| Autor: | El-Sayed A. El-Sheikh, Walaa M. M. Helaly, Mahmoud S. I. Saad |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Technology animal structures media_common.quotation_subject Glycine Insect Peptide hormone 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Animal science Bombyx mori lcsh:Science Biology 030304 developmental biology General Environmental Science media_common chemistry.chemical_classification 0303 health sciences Larva biology fungi biology.organism_classification Amino acid chemistry Silk filament Pyriproxyfen General Earth and Planetary Sciences Instar lcsh:Q 010606 plant biology & botany |
| Zdroj: | Bulletin of the National Research Centre, Vol 43, Iss 1, Pp 1-7 (2019) |
| ISSN: | 2522-8307 |
| Popis: | Background Natural silk is one of the best yarns that attract large number of users and become a very important industry. Mulberry leaves is a natural food of silkworm, therefore scientists have recently incorporated methods for increasing production of silk. These methods use the insect growth regulators (IGRs) or similar peptide hormones and amino acids to prolong the last larval instar to obtain large cocoon and high quality silk recipes. Results The present investigation was carried during the spring (season 2018) to evaluate the effect of growth regulator pyriproxyfen at concentrations 1, 10, and 100 μg/larva on Bombyx mori L., as well as the effect of amino acid glycine 1% concentration solely or in combination with pyriproxyfen at the fifth day of fifth larval instar. Feeding fifth instar larvae of B. mori on mulberry leaves dipped in glycine 1% resulted in a significant increase in the weight of mature larvae and shorter larval duration, recording 5.12 g and 9.00 days, respectively. Meanwhile, the highest significant pupal weight (1.277 g) was attained when larvae were treated topically with pyriproxyfen at 10 μg/larva in the fifth day in combined with glycine 1%. Regarding technological parameters, larvae which were topically treated with pyriproxyfen at 10 μg/larva at fifth day and fed on mulberry leaves immersed in 1% glycine possessed the highest means of cocoon weight, cocoon shell weight, cocoon shell ratio, silk filament weight, and size over other treatments. The total protein and ALT were attained a higher mean recording 78.433 mg/ml and 51.053 mg/ml for control larvae, successively. Meanwhile, it showed the lowest values for total carbohydrate and AST. Conclusion The study showed that pyriproxyfen prolonged the fifth larval instar, while the use of glycine led to shortening the fifth larvae instar. Exposure to mixture of IGR and glycine, however, enhanced the parameters of silk compared with control. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink