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。
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。
The research on tissues culture lays the groundwork for further mutation and polyploidy breeding in Astragalus membranaceus(Fish. ) Bge. var. mongholicus(Bge. ) Hsiao.
针对蒙古黄芪组织培养体系的研究，是诱变育种和多倍体蒙古黄芪育种的基础技术准备。
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