...的时间，将目标性状整合到待 改良的品种中并培育出新品种，育种者总是首先采用最容易获得的种内变异（intraspecific variation）作为改良基础。然而在育种实践中，种内变异有时并不能提供栽培品种所急需的抗 病或抗逆性，如对黄瓜、甜瓜的根结线虫的抗性等。
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图示了新种的种内变异。
The intraspecific variation within these new species are figured.
采用不同引物进行扩增时种内变异的程度有所不同。
By using different primers, the intraspecies variation of RAPD profiles was different.
种内变异的描述和分类已成为当前最有挑战性的问题和最值得探索的领域之一。
The problems of describing and classifying of infraspecific variation as both are nowadays one of the most challenging, and potentially one of most rewarding areas for further study.
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