Recently, a hybrid breeding system was developed for diploid potato. We compared performance of diploid hybrids with commercially available tetraploid cultivars. Therefore, seedling tubers were produced from true hybrid seeds in field conditions. In the subsequent year, diploid hybrids grown from seedling tubers showed a yield potential comparable with commercial tetraploid cultivars: the highest yielding diploid hybrids showed a yield comparable with the lower yielding tetraploid cultivars. Yields of hybrids and commercial tetraploid cultivars were broken down into different yield components and the interactions with growing conditions were quantified. The stability of yield and other relevant traits in different growing conditions was similar between hybrids and commercial cultivars. The contribution of the different yield components to total yield over different environments was compared between diploid hybrids and tetraploid cultivars. In diploid hybrids as well as tetraploid cultivars, more tubers per stem resulted in the highest yield gain, while an increase in tuber size resulted in a relatively smaller increase of total yield.

中文翻译：

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二倍体杂交马铃薯产量成分的贡献和稳定性

最近，针对二倍体马铃薯开发了杂交育种系统。我们将二倍体杂种与市售四倍体栽培品种的性能进行了比较。因此，幼苗块茎是在田间条件下由真正的杂交种子产生的。在随后的一年中，从幼苗块茎中培育出的二倍体杂种显示出与商业四倍体品种相当的产量潜力：产量最高的二倍体杂种显示出与产量较低的四倍体品种相当的产量。杂种和商业四倍体栽培品种的产量被分解为不同的产量组成部分，并量化了与生长条件的相互作用。不同生长条件下产量和其他相关性状的稳定性在杂交品种和商业品种之间相似。比较了二倍体杂种和四倍体品种在不同环境下不同产量成分对总产量的贡献。在二倍体杂种和四倍体品种中，每茎的块茎越多，产量增加最高，而块茎大小的增加导致总产量的增加相对较小。