Greater advance in the* improvement of the fiber qualities has been achieved by the traditional breeding methods,which include crossing, backcrossing and intercrossing, etc.

• 传统的育种方法通过杂交、回交和互交在打破产量与纤维品质性状的负相关方面取得了较大进展，但育种周期长，成本高，选择效率低。