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ISHS Acta Horticulturae 515: XXV International Horticultural Congress, Part 5: Culture Techniques with Special Emphasis on Environmental Implications Chemical, Physical and Biological Means of Regulating Crop Growth in Ornamentals and Other Crops

GUM INDUCTION BY METHYL JASMONATE IN TULIP STEM: RELEVANCE TO ITS CHEMICAL COMPOSITION

Authors:   M. Saniewski, J. Ueda, K. Miyamoto, M. Horbowicz
Keywords:   ethylene, gum, methyl jasmonate, tulip, Tulipa gesneriana
Abstract:
It has been found that gum formation by methyl jasmonate (JA-Me) in leaves and stem of intact tulips is greatly stimulated by 1-aminocyclopropane-1-carboxylic acid (ACC) as a source of ethylene. Analysis of cationic composition of ash from gums formed by JA-Me in tulip stem showed high content of calcium and potassium, and in smaller amounts of magnesium and sodium. Tulip gums formed in leaves and stem induced by JA-Me + ACC treatment contained ca 16% of uronic acid (not identified), and remaining neutral sugar consisted of arabinose (ca 40%) and xylose (ca 60%). These results suggest that tulip gums consist of glucuronoarabinoxylan (GlcN:Ara:Xyl =1:2:3) in the presence of much amount of calcium and potassium.
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