บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Is jasmonic acid involved in the endogenous regulation of Dendrobium orchid flower senescence?

Porat, R.; Borochov, A.; Halevy, A. H.;

Acta Horticulturae Year: 1995 Issue: No. 405 Pages: 314-319 Ref: 11 ref.

1995

บทคัดย่อ

Is jasmonic acid involved in the endogenous regulation of Dendrobium orchid flower senescence?

 

Exogenous application of the methyl ester of jasmonic acid (JA-Me) to Dendrobium cv. Jaquelyn Thomas flowers accelerated their senescence and induced an increase in ethylene production and in 1-aminocyclopropane-1-carboxylic acid (ACC) content. The effects of JA-Me on Dendrobium flower senescence were similar to those of pollination. To study the possible involvement of JA in the endogenous regulation of Dendrobium flower senescence, the effects were examined of JA biosynthesis inhibitors, lipoxygenase (LOX) activity and the accumulation of jasmonates following pollination of Dendrobium flowers. It was found that treating flowers with the LOX inhibitors salicylhydroxamic acid and n-propyl gallate had no effect on the pollination-induced senescence of the flowers. Furthermore, during the 50-h period from pollination to the completion of wilting, there was no increase in LOX activity. During the 10-h period from pollination to the initiation of ethylene production there was no change in jasmonate

content. These results indicate that although exogenous application of JA-Me enhances ethylene production and Dendrobium flower senescence, LOX activity and jasmonates are probably not involved in the endogenous regulation of this process.