利用诱变缺陷型及抗药性标志基因菌株作计划性育种程序,是中线育种途径的一种有效方法,已被广泛采用。由于这种方法在产生缺陷型及抗药性的同时,往往会导致决定其它性状的遗传基础也随之有大的改变,从而表现出某些规律性特征。这就有可能将正突变的某些性状与其它性状进行组合,达 The use of mutagenic and drug-resistant marker gene strains for the planned breeding program is an effective method for breeding of midline breeding and has been widely adopted. As this method produces defective and drug resistance, it often leads to a large change in the genetic basis for determining other traits, thereby showing some regularity characteristics. This makes it possible to combine some of the traits being mutated with other traits