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利用人工去雄、多次授粉法获得(苏丹草×拟高梁)F_1种间杂种。苏丹草(2n=20)与拟高梁(2n=20)杂交结实率及杂种发芽率均较低,正反交存在较大的差异.F_1杂种形态和饲草品质介于双亲之间,雌雄配子均具有一定的孕性。杂种对叶斑病表现较强的抗性。F_1花粉母细胞减数分裂染色体配对较为正常,98.8%的细胞均形成10个二价体,无多价体出现,具单价体的细胞频率仅为1.2%,表明双亲在细胞学上具有较高的同源性。F_2和 BC_1代植株形态、结实率和抗病性等差异较大,分离出饲草品质较好、落粒性弱、种子产量高和抗病性较强的中间型植株,这些后代可能对苏丹草抗病育种或拟高粱品质育种有重要的利用价值。
The artificial interspecies pollination method was used to obtain F_1 interspecific hybrids (Sudan grass × sorghum). The seed setting rate and hybrid germination rate of sudangrass (2n = 20) and quasi-sorghum (2n = 20) were low, there was a big difference between the reciprocal cross and the reciprocal cross.F1 hybrid morphology and forage quality were between parents, male and female gametes Have a certain pregnancy. Hybrids show strong resistance to leaf spot disease. F_1 pollen mother cell meiosis chromosome pairing is normal, 98.8% of the cells are formed 10 bivalents, no multivalent body appear monovalent cells with a frequency of only 1.2%, indicating that the parents in cytology have higher Homology. F_2 and BC_1 plants had larger differences in morphology, seed setting rate and disease resistance, and isolated intermediate plants with better forage quality, weaker fodder, higher seed yield and stronger disease resistance. These offspring may be susceptible to Sudan Grass disease resistance breeding or sorghum quality breeding have important value.