Use of methyl jasmonate for suppression of botrytis rot in various cultivars of cut rose flowers
Meir S.; Droby S.; Kochaneck B.; Salim S. and Philosoph-Hadas S.
5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.100
2004
บทคัดย่อ
Use of methyl jasmonate for suppression of botrytis rot in various cultivars of cut rose flowers
Gray mould, caused by
Botrytis cinerea on flower petals, is a common disease of greenhouse roses (
Rosa hybrida L.). The disease develops rapidly after harvest and causes a significant reduction of cut flowers value. Methyl jasmonate (MJ), known to induce plant defense responses, was examined for postharvest control of this disease in various cultivars of cut roses. We have previously demonstrated that under laboratory conditions, pulsing of cut roses with 200
mM MJ for 24 h at 20°C provided six rose cultivars with a systemic protection against
B. cinerea. Spray application of MJ (> 300
mM) to rose petals provided local protection by direct inhibition of
B. cinerea spore germination and germ-tube elongation. Based on these results, a practical application of MJ consisting of simultaneous pulsing and spraying, was developed for growers handling conditions. The treatment included MJ pulsing for 4 h at 20°C and MJ spraying, followed by continuation of the pulsing for additional 20 h at 6°C. The flowers were then packed and incubated for two days at 6°C for air transport simulation, transferred subsequently to water cylinders placed at 20°C, and artificially inoculated with
B. cinerea spore suspension. The optimal treatment under these conditions was pulsing with 350
mM MJ and spraying with 500
mM MJ. This combined MJ treatment neither increased ethylene production in petals, nor it was phytotoxic.
The MJ treatment effectively suppressed gray mould development following both natural and artificial infection in 11 rose cultivars (‘Frisco’, ‘Jazz’, ‘Mercedes’, ‘Red Charm’, ‘Eskimo’, ‘Profita’, ‘Tamara’, ‘Sun Beam’, ‘Pink Tango’, ‘Carmen’, ‘Golden Gate’). In yellow, orange and pink cultivars, the MJ treatment improved petal colour by inhibiting colour fading during vase life. Collectively, our findings suggest a possible commercial application of MJ as a useful and environmentally friendly means for suppressing Botrytis rot in cut roses.