School of Continuing Studies, The University of Birmingham, B15 2TT, Edgbaston, Birmingham, UK.
Theor Appl Genet. 1992 Jun;84(1-2):180-5. doi: 10.1007/BF00223998.
The Endosperm Balance Number (EBN) hypothesis can explain to a considerable degree the crossability between tuber-bearing Solanum species. It has been shown to be genetically controlled and is dosage dependent. There is a good correlation between EBN and the postulated evolution and present taxonomy of potatoes. The primitive white stellate-flowered species from Mexico are 1EBN, and this condition is also found in species from South America with flowers of the same colour and shape. The evolution of a rotate corolla seems to be correlated with 2EBN. It is postulated that the 2EBN state arose as a reproductive isolating mechanism in South America. The taxonomic and evolutionary implications of the EBN hypothesis are discussed.
胚乳平衡数（EBN）假说可以在相当程度上解释产块茎的茄属物种之间的可杂交性。它已被证明是由遗传控制的，并且与剂量有关。EBN 与假定的土豆进化和现代分类学之间存在很好的相关性。来自墨西哥的原始白色星状花的物种是 1EBN，这种情况也存在于具有相同颜色和形状花朵的南美洲物种中。旋转的花冠的进化似乎与 2EBN 有关。有人假设，2EBN 状态是在南美洲作为一种生殖隔离机制而产生的。讨论了 EBN 假说的分类学和进化意义。
