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育种工作的主要任务在于不断提供新的优良品种以促进生产的持续发展,其途径一般是通过诱变——稳定——比较的程序进行的。花培育种是由单倍体的花粉植株加倍而成二倍纯合体,属一次性稳定,较之杂交育种需经多代自交才能稳定,可大为节省时间。但因花粉培养愈伤组织再形成绿苗的难度较大,获得的绿苗率一般粳稻为7—8％,籼稻为1％,故人们对花粉绿苗十分珍惜。而一块愈伤组织所分化的绿苗,往往有3—5株,多的可达50株以上。来源于同一愈伤组织的绿苗,其性状是否一致,可否作为同质材料使用,育种实践中是以愈伤组织产生的绿苗丛为单位建立区系,还是以绿苗为单位
The main task of breeding work is to continuously provide new varieties to promote the sustainable development of production, the way through the general mutagenesis - stable - comparative procedures. Breeding flowers are double haploid haploid doubled homozygotes, is a one-time stability, compared with the crossbred needs multiple generations of self-stability, can greatly save time. However, pollen culture of callus and then the formation of green seedlings is more difficult to obtain green seedling rate of 7-8% for japonica rice, indica rice is 1%, so people are very treasure of pollen green seedlings. A piece of callus differentiation of green seedlings, often 3-5, more than 50 or more. Green seedlings from the same callus, its traits are consistent, can be used as homogeneous material, breeding practice is based on the callus to create green seedlings as a unit of flora, or green seedlings as a unit