Homoeologous Recombination in Interspecific Hybrids of Lilium
2003
Lim, K.B. (RDA, Suwon, Republic of Korea) | Munikote S. Ramanna2 (Wagening University, P.O. Box 386, 6700 Aj, Wageningen, The Netherlands) | jaap M. Van Tuyl3 (P.O. Box 16,6700 AA, Wageningen, The Netherlands)
Two different types of polyloid progenies were analyzed by genomic in situ hybridization (GISH) in order to estimate the extent of homoeologous recombination. One set of these had originated from a diploid F1 hybrid between Lilium longiflorum ¡¿ L. rubellum(LR, 2n=2x=24) followed by somatic chromosome doubling and crossing the triploid (LLRR, 2n=4x=48) to L. longi florum (LL) as well as to the Oriental hybrid(OO). there crosse gave rise to two type of triploids (2n=3x=36) of the genomic composition LLR and OLR, through the functioning of alloploid 2x-gametes, from LLRR. The GISH analysis revealed no homoelogous recombination in the case of LLR-and OLR-triploids. This could be explained by preferential pairing of homologous chromosomes in LLRR hybrids. The second sets of progenies were derived from unreduced (2n) gametes of the diploid F1 hybrid between L. longiflorum ¡¿ Asiatic hybrid (LA, 2n=2x=24).ALA-triploids and AALA-tetraploids showed considerable intergenomic recombination explainable by homoeologous pairing in LA-hybrid during the origin of 2n-gametes.
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