Correlation of saponin content and Fusarium resistance in hybrids from different ploidy levels of Lilium Oriental
2011
Liu, Wulin | Wu, Li-Fang | Wu, Hong-Zhi | Zheng, Si-Xiang | Wang, Ji-Hua | Liu, Fei-Hu
Lilium Oriental is of great commercial value, but large losses in production can result from its susceptibility to diseases caused by Fusarium ssp. Here we report a mutant of Lilium Oriental resistant to Fusarium, Cai-74, which was generated from crossing tetraploid (from ‘Star fighter’) and diploid (‘Cor. Amore’בAcapulco’) plants. Hybrid progeny were screened via inoculating Fusarium oxysporum into tissue cultured plantlets in a greenhouse. Although Cai-74 had a saponin content of 3.81mgg⁻¹, which is much higher than its parents, the highly Fusarium-resistant wild species Lilium dauricum had the highest content of 4.11mgg⁻¹ among the tested genotypes. Cai-74 had a 3A karyotype rather than 3B found in normal plants of Lilium Oriental. Taken together, our results suggest that Cai-74 bears a chromosomal variation in its structure, and that the saponin content in the lily scales correlate with the Fusarium resistance of Lilium Oriental. Cai-74 could be used as a gene resource for breeding Fusarium-resistant cultivars of Lilium Oriental.
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