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Cytogenetic Studies on Diploid and Autotetraploid Common Buckwheat and Their Autotriploid and Trisomics

^a Institute of Plant Genetics and Breeding, School of Biological Technology and Engineering, Guizhou Normal Univ., Guiyang 550001, Guizhou, P.R. China
^b Technical Univ. of Munich, Institute of Plant Breeding, D-85354 Freising-Weihenstephan, Germany

View larger version (111K): [in this window] [in a new window]   Figure 1. Chromosomes and pollen grains of diploid and autotetraploid common buckwheat and progenies of their hybrids. 1. Diploid buckwheat ‘Sobano’: 2x = 16. 2. Autotetraploid buckwheat ‘Emka’: 4x = 32. 3. Autotriploid hybrid of the cross between Emka and ‘Siva’, 3x = 24. 4. Metaphase I (MI) of pollen mother cell (PMC) meiosis of diploid buckwheat Sobano: 2x = 8II. 5. MI of PMC meiosis of Emka-1: 4x = 8IV. 6: MI of PMC meiosis of the autotriploid hybrid between Emka and Siva: 3x = 6III + 2II + 2I. 7. Telophase II (TII) of PMC meiosis of the autotriploid hybrid, with two micronuclei. 8. Pollen grains of the autotriploid hybrid. 9. Chromosome number of trisomic Tr15, 2n + 1 = 17. 10. MI of PMC meiosis of trisomic Tr15: 2n + 1 = 7II +1III (arrow). 11. Anaphase I of PMC meiosis of trisomic Tr15 with segregation model of 8/9. bar = 2 µm, except in No. 8, where bar = 30 µm.