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.

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。

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Since the first tetraploid was obtained in 1939, polyploidy breeding has always been the focus of watermelon breeding.

从1939年获得第一个四倍体西瓜以来，多倍体育种就一直是西瓜育种的一个热点。

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Since the first tetraploid watermelon was obtained in 1939, polyploidy breeding has always been the focus of watermelon breeding.

从1939年获得第一个四倍体西瓜以来，多倍体育种就一直是西瓜育种的一个热点。

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