Comparative genetic diversity and genetic structure of three chinese silkworm species Bombyx mori L. (Lepidoptera: Bombycidae), Antheraea pernyi Guérin-Meneville and Samia cynthia ricini donovan (Lepidoptera: Saturniidae)

Abstract

-The genetic diversity and genetic structure of three Chinese silkworm species Bombyx mori L., Antheraea pernyi Guérin-Meneville and Samia cynthia ricini Donovan were comparatively assessed based on RAPD markers. At the species level, A. pernyi and B. mori showed high levels of genetic diversity, whereas S. cynthia ricini showed low level of genetic diversity. However, at the strain level, A. pernyi had relatively highest genetic diversity and B. mori had lowest genetic diversity. Analysis of molecular variance (AMOVA) suggested that 60% and 72% of genetic variation resided within strains in A. pernyi and S. cynthia ricini, respectively, whereas only 16% of genetic variation occurred within strains in B. mori. In UPGMA dendrogram, individuals of A. pernyi and B. mori formed the strain-specifi c genetic clades, whereas those of S. cynthia ricini were distributed in a mixed way. The implications of these results for the conservation and utilization in breeding programs of three silkworm species are discussed.

Analysis of the genomic sequence of Philosamia cynthia nucleopolyhedrin virus and comparison with Antheraea pernyinucleopolyhedrin virus

“…Many baculoviruses have an approximate GC content of 41%, whereas PhcyNPV and several other baculoviruses have significantly higher values (50.1% for CfMNPV, 50.9% for CuniNPV, 53.5% for AnpeNPV-L2, 53.5% for AnpeNPV-Z, 53.5% for LyxyNPV, 55.1% for OpMNPV and 57.5% for LdMNPV). However, a detailed analysis of DNA content did not show a clear pattern of GC content that could be associated with each genus [7]. …”

“…The most common breeds are the domesticated silkworm ( Bombyx mori L.) and the wild silkworms, including Chinese oak silkworm ( Antheraea pernyi Guérin-Meneville), the castor silkworm ( Philosamia cynthia ricini ), the Indian tropical tasar silkworm ( A. mylitta Drury) and the Japanese oak silkworm ( A. ayamamai Guérin-Meneville) [7]. Silk production by these moths, especially B .…”

“…The domesticated silkworm ( B . mori ) has been used for silk production by Chinese farmers for approximately 5000 years [7]. It has since spread to Korea, Japan, India, Brazil and the rest of the world.…”

“…It is commercially cultivated for silk production, primarily in China, India and Korea [8]. This silkworm species and the castor silkworm ( P. Cynthia ricini ) were introduced into China for silk production in the 1950s [7]. …”

Análisis de la diversidad genética de 21 aislamientos del hongo Moniliophthora roreri basado en marcadores RAPD

“…La estructura genética es afectada por diferentes factores como el modo de reproducción, flujo genético, formas de dispersión y la selección natural (28). En este estudio se ha mostrado que a pesar de existir distancias considerables entre los puntos de colecta de los aislamientos que varían de 134 a 176 km la diferenciación de 12% como indica el AMOVA realizado entre estas poblaciones no es muy considerable.…”