Studies on the origin of silkworm.Bombyx mori.and an evaluation of its genetic differentiation

对家蚕、野桑蚕和野桑蚕进行了调查和遗传鉴定，走访了泰国和印度的几个机构、大学、公司和农舍，证实了多个热带品系具有耐高温和抗微粒子病的特性。这些菌株的许多变种在任何其他国家都不被承认。这些菌株应该被认为是养蚕科学中有价值的财产。在中国，家蚕的许多品系和许多小种都被日本的养蚕机构和大学以类似的方式保存下来。在乌兹别克斯坦，一年只有一个季节在严酷的天气条件下进行老年农业生产。家蚕的保存品系只有一次世代。乌兹别克斯坦没有保存突变等经济价值不高的家蚕品系。在巴西，蚕茧生产技术是从意大利引进的，始于1927年。然而，意大利品系的家蚕无法检测到。在养蚕已经结束的韩国，还保存着一化性和三化性的蚕种。

Survey and genetical examinations on the domestic silkworm, Bombyx mori, and the wild silkworm, Bombyx mandarina, were carried out in some countries put in plactice moriculture, sericulture and silk industry.We visited several institutions, universities, companies and farmhouses in Thailand and India, and we confirmed many tropical strains of polyvoltine silkworm, which had properties of resistances to high temperature and to pebrine disease. Many varieties of these strains were not recognized in any other countries. These strains should be thought valuable property in sericultural science. In China, many strains and many races of the domestic silkworm had been preservated at sericultural institutions and universities in like manner of Japan. In Uzbekistan, senicultural production were held only one season a year under strict weather conditions. The keeping strains of silkworm were only univoltine. The silkworm strains of economic valueless such as mutants were not preserved in Uzbekistan. In Brasil, the technique of cocoon production was imported from Italy and it started in 1927. However, the silkworm of Italian strain could not detect. In Korea where sericulture has been over, the silkworms of univoltine and trimolter were preserved yet.