迄今为止,作物突变品种大多数是由突变体直接育成的,少部分是来自于突变品种同其它品种或其它突变体杂交育成的。将突变体作亲本成功地用于杂交育种计划的报道近年甚多,育成品种数逐年增多。我们从1972年起,把 IR_8辐射得到的一个早熟突变体72-9(科辐早)同当地品种或其它突变品种进行了广泛杂交,至1977年育成二个新品种,现将其中一个品种——双科1号的选育及其推广应用简报如下。 To date, the majority of crop mutant varieties have been bred directly from mutants, and the small part has been derived from crossing mutant varieties with other cultivars or other mutants. In recent years, many reports on the successful use of mutants as crossbreeding programs have been reported. The number of breeding products has been increasing year by year. Since 1972, we have extensively crossed a precocious mutant 72-9 (Kefuzao) obtained from IR_8 radiation with a local variety or other mutant varieties and bred two new varieties by 1977. Now, one of the varieties - - Double Branch No. 1 selection and promotion of its application briefings are as follows.