บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

High temperature stress and exogenous application of methly jasmonate on peach.

Budde C., Polenta G., Pagni A., Fussi M., Murray R.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.79

2004

บทคัดย่อ

High temperature stress and exogenous application of methly jasmonate on peach. High temperature shocks has been useful in some peach cultivars to prevent chilling injury, although in occasions have caused undesirable side effects.Jasmonates are hormones that play a role in signal transduction cascades, o­n the defense mechanism that plants have developed against biotic and abiotic stresses.Jasmonic acid (JA) and Methyl Jasmonate (MJ) show similar physiological responses.MJ may be an essential link in the signal transduction chain between the external stimulus and the internal response to stress.In this way, it would be expected that exogenous application of jasmonates may elicit a response similar to stress, to defend against stress, but without the undesirable effects or damage to fruits that stress may cause.

The aim of this experiment was to compare thermal stress (40 °C for 46h) against different exogenous applications of MJ.Fruits of ‘Dixiland’ were immersed into solutions of 0, 10, 100 and 1000 mM for 30s.‘Dixiland’ has responded to heat shock treatments in previous experiments, diminishing chilling injury symptoms.In this experiment ethylene production was analyzed after the treatment every day up to ten days, and activities of polygalacturonase and pectinmethylesterase were evaluated o­n the first two days.Heat treatment fruits and those treated with the highest concentration of MJ had a similar pattern in ethylene evolution, while o­n the other hand control fruits and those treated with 10 and 100 mM showed lower production of ethylene.This results may be an indication that, at least, some effects produced by heat treatments may be similarly induced by the external application of MJ.