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KMID : 1041219970390010022
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Journal of Sericultural and Entomological Science
1997 Volume.39 No. 1 p.22 ~ p.29
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Variation and Sex-limited Expression of Fluorescent Color by Ultraviolet Spectrum on the Silkworm Cocoon
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Abstract
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Ultraviolet weavelength (UV) of 366 nm produced clearer fluorescent color than that of 254nm for the inspection of silkworm cocoons. Fluorescent color of silkworm cocoons varied in color, appears no relationship with the natural color under the normal light. Uniformity of fluorescent color was improved by selection of blue or yellow line from wild types. Blue and yellow, located at the opposite poles on the color solid and L*a*b* color system, confirmed as pure standard of fluorescent color in the silkworm races for commercial white cocoons. The cocoons with blue fluorescence orcupied as high as 1.7 to 8.6 times than those with yellow in the Japanese silkworm races. Fluorescence of silkworm cocoon was not affected by forced flow dry at 70°C for 6 hrs. While the Japanese races revealed no sexual difference in fluorescent color, sex-dependence of the color was common in the Chinese races for commercial white cocoon. The fluorescence of cocoon shell of Chinese races showed clear separation of blue female by contrast with yellow male, However, fewer strain segregative with broad borderline of median color. Silkworm strain of Dc20 and Fc24 were sexualy segregated 98.8 ± 1.20%, 99.0±1.00% by cocoon fluoresrenre, as high as that of 99.3±0.44%, by typical larval marking of sex-limited inheritanre.Specific expression of cocoon fluoresrence, applicable to breeding or simple discrimination of sex for Chinese races, inspected thoroughly on the surface and inner layer of cocoon shell.
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KEYWORD
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