Effect of jasmonic acid to resistance against Fusarium in lily
2011
Lily blight disease caused by the soil-borne pathogen Fusarium oxysporum f. sp. lilii is one of the most serious diseases in lilies. One way of controlling the disease would be the breeding and screening for resistant cultivars. Endogenous jasmonic acid (JA) plays an important role to induce resistance against infection of pathogens. In order to find the relationship between the level of resistance to Fusarium and JA contents in different lily varieties, we evaluated resistance to Fusarium in L. amoenum, Oriental hybrids ‘Siberia’, ‘Tiber’, ‘Egypt’, and L. L. formosanum ×L. longiflorum var. scabrum. JA contents were measured by gas chromatography-mass spectrometry (GC-MS). The results showed L. amoenum, Oriental hybrids ‘Tiber’ and ‘Egpyt’, and hybrids of L. Lilium formosanum × L. longiflorum var. scabrum are susceptible to Fusarium with disease-index values were 51.7, 63.3, 65.6 and 59.3, respectively. Oriental hybrid ‘Siberia’ is resistant to disease with a disease index value of 25.4. Jasmonic acid was determined at 0 and 24 h after Fusarium was inoculated. In Oriental hybrids ‘Tiber’ and ‘Egypt’, content of JA decreased from 5,538 to 2,586 ng and from 3,248 to 2,546 ng individually. It was demonstrated JA content decreased in susceptible Oriental hybrids ‘Tiber’ and ‘Egypt’ after inoculation. In Oriental hybrid ‘Siberia’, content of JA from 1,741 ng increased to 5,420. It was demonstrated Fusarium induced an increase of JA content in resistant Oriental hybrid ‘Siberia’. It was suggested that content of JA and Fusarium resistance level was related to a certain extent, and JA may be used to determine the resistance level of lily to the pathogen Fusarium.
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