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KMID : 0368419790220030071
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Journal of Plant Biology
1979 Volume.22 No. 3 p.71 ~ p.80
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Utilization of Tuber-bearing Solanum triploids in Studies of Species Differentiation
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Lee Heiyoung-Kim
H. T. Erickson
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Abstract
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Triploids of inter-and intra-specific hybrid of tuber-bearing Solanum, involving 4x S. tuberosum, S. stoloniferum, S. fendleri and S. chacoense and other diploid species were used to study the affinity between the species.
The number of multivalent formations in triploids depended on the cross combination. However, multivalent formation from triploids produced by 4x×2x crosses within S. chacoense did not differ from triploids from S. tuberosum (4x)×S. chacoense (2x). Many of the triploid hybrids had 13 or more bivalents plus trivalents and quadrivalents indicating slight autosyndesis. As the basic chromosome number in potato is assumed to be 12, the slight excess pairing might be due to structural differences of chromosomes and eventually to non- or partial-homologous pairing.
Male fertility of triploid hybrids was very low (less than 7.2% stainable pollen) with exceptions of triploids, involving S. tuberosum × S. chacoense (49.16%) and S. Chacoense (4x) × S. chacoense (2x) (30.25%). Pillen fertility was associated with chromosome affinity at first metaphase rather than with chromosome distribution at second metaphase. The large number of multivalents and high pollen fertility in the triploid hybrid of S. tuberosum × S. chacoense, indicates a very high affinity of these two species.
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