已有多种方法被用于提高地方良种的性能，包括杂交育种，以及通过与良种的回交和品系内选育进行的品种改良。

Various approaches have been used to improve the performance of adapted indigenous stock, including cross-breeding and upgrading through back-crossing with improved breeds, and within-line selection.

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在中期，通过分子生物学技术辅助的常规杂交育种(分子标记辅助育种)就足以满足要求了。

In the medium term, conventional crossbreeding helped by molecular biology techniques (a technique called "marker assisted breeding") may suffice.

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人们通过常规杂交育种、辐射育种、组织培养育种、多倍体育种、航天育种等手段培育了大量的花卉新品种。

Breeders have bred a great deal of new flower varieties by taking routine cross breeding, radiation breeding, tissue culture breeding, polyploidy breeding, and spaceflight breeding etc.

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