Abstract
Based on previous publications, allotriploid (LLO) lily ‘Triumphator’ is seemingly exceptional to the hypothesis – five same genomes is essential for its endosperm development in interploid hybridizations of Lilium, because it could be hybridized with TTTT, OTOT, or even AA;however, no LLO × LL is used as control in these reports, and its abnormal meiosis is unknown. In order to confirm the speciality, the present research investigated ‘Triumphator’ (LLO, 2n = 3x = 36) for its microsporogenesis, female fertility and its progenies’ genome composition. The results of its microsporogenesis showed that the homologous chromosomes of two L-genomes formed bivalents; the chromosomes of O-genome formed univalents, suggesting that intergenomic recombination between L-genome and O-genome hardly occur. This was the reason for that no intergenomic recombinant chromosome was found in its progenies. Interploid hybridizaitons showed that the LLO × LL was much more successful than LLO × TT/OO, strongly suggesting that ‘Triumphator’ is not exceptional to the lily five same genomes of endosperm hypothesis because the endosperm genomes of LLO × LL, LLO × TT and LLO × OO are 5L + 2O, 4L + 2O + T and 4L + 3O, respectively, i.e. only the endosperm of LLO × LL containing 5 same genomes (5 L). The hypothesis is highly valuable to guide lily breeding.
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