ISHS Acta Horticulturae 673: IX International Symposium on Flower Bulbs
GUM FORMATION IN TULIPS AFFECTED BY METHYL JASMONATE REQUIRES CHANGES IN SUGAR METABOLISM |
| Authors: | E. Skrzypek, K. Miyamoto, M. Saniewski, N. Higuchi, J. Ueda |
| Keywords: | ethephon, ethylene, gummosis, jasmonate, methyl jasmonate, soluble sugars, tulip, Tulipa gesneriana |
| Abstract:
The purpose of this study was to investigate the mechanism of jasmonates in the induction of gum formation in tulip shoots (cv. Apeldoorn), especially as related to sugar metabolism. Gum formation in the first internode of tulip shoots was induced by the application of methyl jasmonate (JA-Me, 1% w/w in lanolin) 5 days; this was strongly stimulated by the simultaneous application of ethylene-releasing compound, ethephon (2-chloroethylphosphonic acid, 1% w/w in lanolin). Ethephon alone had little effect. JA-Me stimulated ethylene production of the 1st internodes of tulip shoots, the production increasing more than 5-fold at day 1 and day 3 after application. Conversely, application of ethephon had no effect on endogenous levels of jasmonates in tulip shoots. JA-Me strongly reduced the total amount of soluble sugars in tulip shoots even in 1 day after application, being ca. 50% of initial values 5 days after application, but ethephon did not, although both JA-Me and ethephon stimulated senescence of the shoot shown by the loss of chlorophyll. These results strongly suggest that gum formation induced by the application of jasmonates in tulip shoots is connected with sugar metabolism. The mode of action of jasmonates in gummosis of tulip shoots will be discussed in relation to ethylene production, sugar metabolism and senescence. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
