桑树多倍体育种的研究,日本、苏联开展较早,积累了许多资料。一般认为四倍体桑叶形大、叶肉厚、叶质好、饲料效率高,但发条数少,枝条伸长短。产桑量低,孕性差,未能直接用于生产。杨今后(1984,1989)和作者(1989,1990)的研究结果大致相似,但从处理桑树杂种实生苗诱导获得104份四倍体桑植株中,发现有些长势强的材料,初步选出13份与推广品种塘10×伦109为对照进行比较,经2年试验,选出具有高产、优质的四倍体桑有粤诱4号、粤诱6号、粤诱12号、粤诱26号和粤诱 Mulberry polyploid breeding research, Japan, the Soviet Union carried out earlier, has accumulated a lot of information. Generally considered tetraploid mulberry leaf shape, thick leaves, leaf quality, feed efficiency, but a few hair, short branches. Yield low moss, poor pregnancy, failed to be used directly in the production. Yang later (1984,1989) and the author (1989,1990) the results of similar studies, but from the treatment of mulberry hybrid seedlings induced 104 tetraploid mulberry plants, found some growing strong material, the initial selection of 13 With the promotion of varieties of ponds 10 × Lun 109 for comparison, after two years of trials, selected with high yield, high quality tetraploid Sang Yue Yue 4, Yue lure 6, Yue lure 12, Yue lure 26 and Guangdong lure