【摘要】 本实验采用枝条下垂的垂枝桑（M.alba Var.Pendula Dippel）为母本,枝条直立的纳溪桑（M.alba.L）为父本,进行杂交和回交.实验结果是:杂交F₁苗木154株,苗干直立,侧枝斜出或平伸,无下垂枝条;回交苗木14株,其中5株苗木苗干下弯,枝条下垂,另9株苗木苗干直立,枝条直立或斜出,无下垂现象.初步表明垂枝桑枝条下垂性受隐性基因控制,纳溪桑枝条的直立性受显性基因控制.更多还原

【Abstract】 Cross and backcross were made with drooping mulberry (Monus alba var. pendula Dippel), whichhas pendulous branches, as the female pent and Na Xi mulberry (M.alba L.), which is character-ized by erect branches, as the male parent. One hundred and fifty - four F1 seedlings were obtained, allof which had erect trunk and up - slanting or horizontal offshoots, without any drooping branches. In thebackcross, 14 offsprings were obtained, of which 5 had crooked trunk and drooping branches and 8 haderect trunk and erect or up - slanting branches., with no branch drooping. Such results suggest that thedrooping, or pendulous, branch character of M. alba var. pendula Dippel is controlled by a recessivegene while the character of erect branches in Na ki mulberry is conditioned by a dominant gene.更多还原