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优树子代测定是良种选育的中心环节,是提高选种效果的重要基础工作。当前对桉树的选优都按表现型选择,优树的表现型是其遗传因素和环境条件相互影响的结果,这种良好的表现型是环境条件的作用,还是由遗传因素所决定?能否传递给后代?究竟有多大遗传强度均不得而知。林木育种的实践表明:光靠表现型选择是没有什么效果的,必须按照一定的验试设计,根据子代的表现对亲本的遗传价值作出评定,才能获得较好的选择效果,这就必须通过子代测定的方法,子代测定因交配方式的不同,有自由授粉测定、白交系测定和多系杂交
The determination of elite offspring is the key aspect of seed selection and breeding, which is an important basic work to improve the effect of seed selection. Eucalyptus is currently the selection of phenotypic phenotypic selection, superior tree phenotype is the result of their genetic factors and environmental conditions, the result of this good phenotype is the role of environmental conditions, or by the genetic factors? Passed to future generations? How much genetic strength are unknown. The practice of tree breeding shows that selection depends on phenotype only and there is no effect. We must evaluate the genetic value of the parents according to the performance of the offspring in order to get a better selection result, which must be approved Progeny determination methods, offspring determination due to the different methods of mating, free pollination determination, determination of white cross and multi-line hybridization