ISHS Acta Horticulturae 522: XXV International Horticultural Congress, Part 12: Application of Biotechnology and Molecular Biology and Breeding - General Breeding, Breeding and Evaluation of Temperate Zone Fruits for the Tropics and the Subtropics.
PLOIDY OF PROGENIES IN CROSSES BETWEEN DIPLOID, TRIPLOID AND TETRAPLOID IN TULIP. |
| Authors: | K. Okazaki, M. Nishimura |
| Keywords: | Ploidy, Chromosome, Tulip |
| Abstract:
Interploidy crosses between diploid (2x=24), triploid (3x=36) and tetraploid (2x=48) tulip varieties (T. gesneriana, T. fosteriana, and their hybrids) were conducted. Diploids and aneuploids were obtained from 2x X 3x and 3x X 2x crosses (T. gesneriana X T. gesneriana). In the 2x X 3x crosses 92.6% were diploids and 7.4% were aneuploids, while in the 3x X 2x crosses 60.0% were diploids and 40.0% were aneuploids, and the ratio of progenies with lower chromosome number (24 – 30) was significantly higher than that of theoretical expectations in the both crosses. In crosses involving Darwin Hybrids (interspecific varieties between T. gesneriana and T. fosteriana), two crosses among 62 cross combinations produced progenies and the resulting seedlings had chromosome number ranging from 24 to 36. These seedlings would be useful in the introgression of genes from T. fosteriana into T. gesneriana. | |
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