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Kasa M, Jolapuram S, Lima A, Didugu BGL, Poosapati JR, Mamillapalli A. Bivoltine cocoon color sex-limited breeds of Bombyx mori (Lepidoptera: Bombycidae) show enhanced economic performance and fecundity following spermidine supplementation. JOURNAL OF ECONOMIC ENTOMOLOGY 2023; 116:1679-1688. [PMID: 37467486 DOI: 10.1093/jee/toad126] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 06/09/2023] [Accepted: 06/23/2023] [Indexed: 07/21/2023]
Abstract
Sericulture has immense economic significance. Separating male and female silkworm pupae for egg production in grainage is a laborious task; hence, sex-limited breeds for cocoon color are advantageous for this process. The major constraint in sex-limited breeds is their low fecundity. Sex-limited female moths lay a lower number of eggs than nonsex-limited breeds. Polyamine, spermidine was shown to improve fecundity in several organisms, including the silkworm, Bombyx mori L. In the present study, cocoon color sex-limited breeds, HTO2SL, APS27SL, and SLFC27, were selected and fed with spermidine to improve fecundity and nutritional efficiency. The fifth-instar silkworm larvae of the selected breeds were subjected to standard rearing conditions with and without spermidine supplementation up to spinning. The spermidine-supplemented sex-limited breeds exhibited a significant increase in fecundity, nutritional indices, and economic parameters compared with the control sex-limited breeds. Among the 3 sex-limited breeds tested, the performance of APS27SL improved significantly.
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Affiliation(s)
- Madhavi Kasa
- Bivoltine Silkworm Breeding Laboratory, Andhra Pradesh State Sericulture Research and Development Institute, Kirikera-515 211, Hindupur, AP, India
- Department of Biotechnology, School of Science, GITAM (Deemed to be University), Visakhapatnam 530 045, AP, India
| | - Seetharamulu Jolapuram
- Bivoltine Silkworm Breeding Laboratory, Andhra Pradesh State Sericulture Research and Development Institute, Kirikera-515 211, Hindupur, AP, India
| | - Anugata Lima
- Department of Biotechnology, School of Science, GITAM (Deemed to be University), Visakhapatnam 530 045, AP, India
| | - Brinda Goda Lakshmi Didugu
- Department of Biotechnology, School of Science, GITAM (Deemed to be University), Visakhapatnam 530 045, AP, India
| | - Jagannatha Raju Poosapati
- Bivoltine Silkworm Breeding Laboratory, Andhra Pradesh State Sericulture Research and Development Institute, Kirikera-515 211, Hindupur, AP, India
| | - Anitha Mamillapalli
- Department of Biotechnology, School of Science, GITAM (Deemed to be University), Visakhapatnam 530 045, AP, India
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Urbán-Duarte D, Tomita S, Sakai H, Sezutsu H, De La Torre-Sánchez JF, Kainoh Y, Furukawa S, Uchino K. An Effective Chemical Permeabilization of Silkworm Embryos. Bioengineering (Basel) 2023; 10:bioengineering10050563. [PMID: 37237633 DOI: 10.3390/bioengineering10050563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/24/2023] [Accepted: 05/03/2023] [Indexed: 05/28/2023] Open
Abstract
The lipid layer surrounding the vitelline membrane of insect eggs has a critical role in the waterproofing and desiccation resistance of embryos. However, this lipid layer also prevents the flux of chemicals into the embryos, such as cryoprotectants, which are required for successful cryopreservation. The permeabilization studies of silkworm embryos remain insufficient. Therefore, in this study, we developed a permeabilization method to remove the lipid layer in the silkworm, Bombyx mori, and examined factors affecting the viability of dechorionated embryos, including the types and exposure times of chemicals and embryonic stages. Among the chemicals used, hexane and heptane were effective for permeabilization, whereas Triton X-100 and Tween-80 were less effective. Regarding the embryonic stages, there were significant differences between 160 and 166 h after egg laying (AEL) at 25 °C. Consequently, we found that the treatment of 160 AEL embryos with hexane for 30 s was the best condition for the permeability and viability of embryos, in which over 62% of the permeabilized embryos grew up to the second larval instar and their moths could lay fertilized eggs. Our method can be used for various purposes, including permeability investigations using other chemicals and embryonic cryopreservation.
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Affiliation(s)
- David Urbán-Duarte
- Centro Nacional de Recursos Genéticos, Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Tepatitlán de Morelos 47600, Jalisco, Mexico
| | - Shuichiro Tomita
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, 1-2 Owashi, Tsukuba 305-8634, Ibaraki, Japan
| | - Hiroki Sakai
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, 1-2 Owashi, Tsukuba 305-8634, Ibaraki, Japan
| | - Hideki Sezutsu
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, 1-2 Owashi, Tsukuba 305-8634, Ibaraki, Japan
| | - José Fernando De La Torre-Sánchez
- Centro Nacional de Investigación Disciplinaria en Agricultura Familiar, Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Ojuelos 47540, Jalisco, Mexico
| | - Yooichi Kainoh
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8572, Ibaraki, Japan
| | - Seiichi Furukawa
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8572, Ibaraki, Japan
| | - Keiro Uchino
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, 1-2 Owashi, Tsukuba 305-8634, Ibaraki, Japan
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