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| Breeding of A New Silkworm Variety Yuecan No.11 Resistant to BmNPV |
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| DOI：10.16768/j.issn.1004-874X.2020.08.016 |
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| Abstract: |
| 【Objective】The selection of new BmNPV resistant silkworm varieties suitable for breeding in Guangdong sericultural areas will provide excellent varieties for stable production in rearing season subjected to BmNPV.【Method】The resistant silkworm germplasms were created by successive generation of pathogen stress and space mutagenesis, and then Chinese varieties and Japanese varieties were bred by means of hybridization and systematic breeding. On this basis, the combination of the quaternary hybrid of Chinese strain·Chinese strain× Japanese strain·Japanese strain was carried out. Taking the current silkworm variety Liangguangerhao in Guangdong Province as the control, the laboratory comparison, the resistance test to BmNPV, the laboratory joint identification for two consecutive years and the rural production identification were carried out.【Result】Chinese varieties Fukang and Chun 5N as well as the Japanese varieties Hang 7 and 7532N were bred, and the quaternary hybrid combination Fukang·Chun 5N × Hang 7·7532N was formed, named Yuecan No. 11. The resistance of this variety to BmNPV was significantly higher than that of the control. In the laboratory joint identification test, the comprehensive performance was as follows: Yuecan No. 11 had the same duration as Liangguangerhao, with strong vitality, larva-pupa rate of 97.58%, cocoon weight of 1.712 g, cocoon shell weight of 0.369 g, cocoon shell rate of 21.55%,cocoon weight per 10 000 larvae of 16.874 kg, cocoon shell weight per 10 000 larvae of 3.636 kg, single cocoon filament length of 942 m, reelability of 80.15%, filament size of 2.568 dtex and neatness of 93.5 points.【Conclusion】The silkworms of Yuecan No. 11 grow and develop uniformly with strong resistance to BmNPV, with high cocoon yield and excellent silk quality. The new silkworm variety is easy to reproduce and bred with good comprehensive characters. It passed the identification of new varieties of crops in Guangdong Province in October 2019, and is suitable for breeding in sericultural areas of Guangdong Province all year round. |
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