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Primary Trisomics in Soybean

Origin, Identification, Breeding Behavior, and Use in Linkage Mapping

Dep. of Crop Sciences, Univ. of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801 USA

View larger version (131K): [in a new window]   Fig. 1 Pods and seeds of triplo 1 and its disomic in soybean. a. Pods (left) of disomic (top) and triplo 1 (bottom). b. Seeds of disomic (top) triplo 1 (bottom)

View larger version (30K): [in a new window]   Fig. 2 Photomicrographs of mitotic metaphase chromosomes in soybean. a. A cell with 2n = 40 chromosomes in a disomic plant (arrows indicate two satellite chromosomes). b. A cell with 2n = 41 chromosomes in a primary trisomic (triplo 13) for nucleolus organizer chromosomes (arrows indicate three satellite chromosomes). Bar = 10µm

View larger version (117K): [in a new window]   Fig. 3 Photomicrographs of trivalent configurations at pachytene in primary trisomics of soybean (arrowheads and arrows indicate the centromeres and extra chromosomes, respectively). a. Triplo 1. b. Triplo 2. c. Triplo 3. d. Triplo 4. e. Triplo 5. f. Triplo 6. g. Triplo 7. h. Triplo 8. i. Triplo 9. j. Triplo 10. k. Triplo 11. l. Triplo 12. m. Triplo 13. n. Triplo 14. o. Triplo 15. p. Triplo 16. q. Triplo 17. r. Triplo 18. s. Triplo 19. t. Triplo 20. Bar = 10µm

View larger version (71K): [in a new window]   Fig. 4 Meiotic pairing configurations at metaphase I in primary trisomics. a. A cell with one trivalent (arrow) and 19 bivalents in triplo 20. b. A cell with 20 bivalents and one univalent in triplo 20. Bar = 10 µm

View larger version (43K): [in a new window]   Fig. 5 Meiotic pairing configurations at metaphase I in 42-chromosome F1 hybrids from crosses between primary trisomics. a. A cell with 21 bivalents in F1 hybrid of SRF-70:28 x triplo 5. b. A cell with 20 bivalents and two univalents (arrows) in F1 hybrid of triplo 2 x triplo 5. c. A cell with one V-shaped trivalent (indicated by a large arrow) 19 bivalents and one univalent trivalent (indicated by a small arrow) in F1 hybrid of triplo 2 x triplo 5. d. A cell with one chain trivalent (indicated by arrow) and one V-shaped trivalent (indicated by arrow) and 18 bivalents in F1 hybrid of triplo 2 x triplo 5. Bar = 10 µm