Groundnut Improvement Programme, ICRISAT, P.O. 502 324, Patancheru, India.
Theor Appl Genet. 1984 Jul;68(4):355-64. doi: 10.1007/BF00267889.
Cross-compatibility of species in section Arachis Krap. et Greg. nom. nud., and chromosome pairing and pollen fertility in their interspecific F1 hybrids were studied to further understand the phylogenetic relationships among these species. Except those with A. batizocoi Krap. et Greg. nom. nud., hybrids between diploid species have near normal bivalent frequency (9.1-9.8) and moderate to high pollen fertility (60-91%). Hybrids between A. batizocoi and other species have low bivalent frequency (5.2-6.9) and very low pollen fertility (3-7%). These results confirm the earlier separation of these species into two groups based on karyomorphology and Mahalanobis D(2) calculated on arm ratios. These studies also provide a picture of relative affinities between A. batizocoi, the lone member of one cluster, and the other species, and among the rest of the species. They also indicate that the basic chromosome complement in the two groups of species is the same. Chromosome pairing in triploid hybrids, (A. hypogaea L. X diploid wild species), suggests that A. batizocoi is the closest diploid relative of A. hypogaea. It is closer to A. hypogaea subspecies fastigiata Waldron than to A. hypogaea subspecies hypogaea Krap. et. Rig. Other diploid species of the section Arachis are equidistant from A. hypogaea, and have the same genome which has strong homology to one of the genomes of A. hypogaea. Based on the present results, the two tetraploid species, A. monticola Krap. et Rig. and A. hypogaea can be recognised as two forms of the same species. Breeding implications have been discussed in the light of chromosome behaviour observed in hybrids of A. hypogaea X diploid species, and on the presumptions that A. hypogaea has an AABB genomic constitution, and that among the diploid species, the 'B' genome is present in A. batizocoi while the 'A' genome is common to the other diploid species of section Arachis.
对 Arachis Krap. 和 Greg. 裸名中的物种进行交叉兼容性研究，以及它们种间 F1 杂种的染色体配对和花粉活力，以进一步了解这些物种的系统发育关系。除了那些与 A. batizocoi Krap. 和 Greg. 裸名的物种外，二倍体物种之间的杂种具有接近正常的二价体频率（9.1-9.8）和中等至高的花粉活力（60-91%）。A. batizocoi 与其他物种之间的杂种具有低的二价体频率（5.2-6.9）和极低的花粉活力（3-7%）。这些结果证实了早期基于染色体形态学和基于臂比计算的 Mahalanobis D(2) 将这些物种分为两组的分离。这些研究还提供了 A. batizocoi 作为一个聚类的唯一成员与其他物种以及其余物种之间相对亲缘关系的图片。它们还表明，两组物种的基本染色体组成是相同的。三倍体杂种（A. hypogaea L. X 二倍体野生种）中的染色体配对表明，A. batizocoi 是 A. hypogaea 的最接近的二倍体亲缘关系。它与 A. hypogaea 亚种 fastigiata Waldron 比与 A. hypogaea 亚种 hypogaea Krap. 和 Rig. 更接近。该节 Arachis 的其他二倍体物种与 A. hypogaea 等距，并且具有与 A. hypogaea 之一基因组具有强同源性的相同基因组。基于目前的结果，两种四倍体物种，A. monticola Krap. 和 Rig. 和 A. hypogaea 可以被识别为同一物种的两种形式。根据在 A. hypogaea X 二倍体物种杂种中观察到的染色体行为以及假设 A. hypogaea 具有 AABB 基因组组成，并且在二倍体物种中，'B'基因组存在于 A. batizocoi 中，而' A'基因组在该节 Arachis 的其他二倍体物种中共同存在，讨论了育种意义。
