Suppression of Botrytis rot in cut rose flowers by postharvest application of methyl jasmonate
Shimon Meir, Samir Droby, Herman Davidson, Shoshana Alsevia, Lea Cohen, Batia Horev and Sonia Philosoph-Hadas
Postharvest Biology and Technology Vol: 13 Issue: 3 Pages: 235-243.
1998
บทคัดย่อ
Grey mould, caused by Botrytis cinerea infection on rose (Rosa
hybrida L.) petals, is a common disease of greenhouse roses, that
significantly reduces the ornamental value of the cut flowers. Methyl jasmonate
(MJ), a natural growth regulator postulated to induce plant defense responses,
was tested for postharvest control of the grey mould disease in various cut
rose cultivars (Mercedes, Europa, Lambada, Frisco, Sacha and Eskimo). Systemic
protection against B. cinerea was evident for all cultivars examined, in
flowers pulsed with 200 
M
MJ following either natural or artificial infection. At this concentration, MJ
also significantly reduced lesion size and appearance, as evaluated by a
detached petal bioassay. However, local protection, following simultaneous
application of B. cinerea spores and MJ directly to flower petals, was
not provided by less than 300 M
MJ. These MJ concentrations neither caused any phytotoxicity on leaves and
petals, nor impaired flower quality and longevity. A direct antifungal effect
of 100¯400 M
MJ on spore germination and germ-tube elongation of B. cinerea was
obtained in vitro, with complete inhibition at 400 M
MJ. These results suggest that MJ pulsing provides systemic protection against
Botrytis rot by inducing resistance mechanisms in the treated cut roses without
impairing flower quality.