家蚕和中国野桑蚕远缘杂交育种的初步研究

对三个远缘杂交后代的选育结果表明，野桑蚕可用于培育细丝品种和龄期短品种等。由于野桑蚕茧丝表现较差，对家蚕亲本的茧丝质应有较高的要求，同时可回交家蚕亲本以改良远缘杂交后代的茧丝质。远缘杂交后代宜尽早根据形质性状的分离建立品系，实行蛾区育，但对茧丝性状（除纤度外）的选择宜延迟到Ｆ４代以后进行；另外利用性状间相关和选择隐性性状可克服远交后代分离复杂、分离时间长的缺点，以加快育种进程。

New Variety Breeding from Outcrosses between Domestic Wild Silkworms

The results of three out-combinations indicated that the wild silkworm could be utilized to attain breeds with short larval instar period and fine filament size as bridge materials in domestic silkworm breeding and to enrich gene pool of the domestic silkworm. The domestic parent should be of superior cocoon and filament quality in outbreeding.The selection was even more efficient when started from F 4 thereafter.The line should be set up as early as possible according to the segregation of qualitative characters and backcrossed with domestic silkworms while making use of relationships between characters and paying attentions to recessive characters to speed up breeding procedure.