Abstract
AbstractOriental hybrid lily is of great commercial value, but it is susceptible to Fusarium disease that causes a significant loss to the production. A diploid Oriental hybrid resistant to Fusarium, Cai-74, was diploidized from triploid obtained from the offspring of tetraploid (from ‘Star Fighter’) and diploid (‘Con Amore’, ‘Acapulco’) by screening the hybrids of different cross combinations following inoculating Fusarium oxysporum to the tissue cultured plantlets in a greenhouse. By analyzing saponins content in bulbs of a number of lily genotypes with a known Fusarium resistance, it was found that the mutant Cai-74 had a much higher content of saponin than its parents. Highly resistant wild L. dauricum had the highest level (4.59mg/g), followed by the resistant Cai-74 with 4.01mg/g. The resistant OT cultivars ‘Conca d’or’ and ‘Robina’ had a higher saponins content (3.70 mg/g) and 2.83 mg/g, than the susceptible Oriental lily cultivars ‘Sorbonne’, ‘Siberia’ and ‘Tiber’. The hybrid Cai-74 had a different karyotype compared with the normal Lilium Oriental hybrid cultivars. The results suggested that Cai-74 carries a chromosomal variation correlated to Fusarium resistance. Cai-74 might be used as a genetic resource for breeding of Fusarium resistant cultivars of Oriental hybrid lilies.
Highlights
As one of the four cut flowers of most importance, lily is of great commercial value
Fusariumresistant mutants were found among the hybrids of Lilium Oriental of different ploidy and they would be used as gene resource for the Fusarium-resistant breeding of Lilium Oriental
This paper introduced the results of a test done to the hybrids for the Fusarium resistance and the variations in saponin content and in karyotype
Summary
As one of the four cut flowers of most importance, lily is of great commercial value. Among the fungal diseases of lily, the basal decay (bulb root) caused by single infection of Fusarium oxysporum or compound infection of Fusarium oxysporum with other pathogens is the most serious and common one (Löffler et al, 1996; Lawson et al, 1996; Linderman, 1981). How to get the Fusarium-resistant mutants is of great value for breeding of lily and its production, especially for the Lilium Oriental that lacks inherent resistant gene. Saponin content could be an indicator for the degree of Fusarium resistance in Lilium (Curir et al, 2003). Fusariumresistant mutants were found among the hybrids of Lilium Oriental of different ploidy and they would be used as gene resource for the Fusarium-resistant breeding of Lilium Oriental. This paper introduced the results of a test done to the hybrids for the Fusarium resistance and the variations in saponin content and in karyotype
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