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Diploid-like meiotic behavior in synthesized amphiploids of the genus Glycine Willd. subgenus Glycine



Diploid-like meiotic behavior in synthesized amphiploids of the genus Glycine Willd. subgenus Glycine



Canadian Journal of Genetics and Cytology 27(6): 655-660



Six amphiploids consisting of one allotetraploid (2n = 4x = 80), 4 allohexaploids (2n = 6x = 120), and one allooctoploid (2n = 8x = 160) were synthesized by doubling the chromosomes of the following F1 interspecific hybrids: one diploid (Glycine latifolia 2n = 2x = 40 X G. clandestina, short pod (Sp), 2n = 2x = 40); 4 triploids (G. clandestina, Sp, 2n = 2x = 40 X G. tabacina 2n = 4x = 80, G. tabacina 2n = 4x = 80 X G. canescens 2n = 2x = 40, G. tomentella 2n = 4x = 80 X G. canescens 2n = 2x = 40 and its reciprocal); and one tetraploid (G. tomentella 2n = 4x = 80 X G. tabacina 2n = 4x = 80). Chromosomal chimaerism was observed in the C1 generation. Pod set was recorded in all the colchicine-treated hybrids except in the the tetraploid hybrid of G. tomentella X G. tabacina. In C2 generation plants, chromosomal instability was noticed only in the allohexaploid of G. tabacina X G. canescens. All of the amphiploids showed diploid-like meiosis in the majority of the sporocytes and did not exhibit the expected multivalent associations. This is attributed to strong preferential pairing between homologous chromosomes which, it is suggested, may be under genetic control.

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Accession: 001336799

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DOI: 10.1139/g85-099



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