Abstract
The inhibitory mode of action of jasmonic acid (JA) on the growth of etiolated oat (Avena sativa L. cv. Victory) coleoptile segments was studied in relation to the synthesis of cell wall polysaccharides using [14C]glucose. Exogenously applied JA significantly inhibited indoleacetic acid (IAA)-induced elongation of oat coleoptile segments and prevented the increase of the total amounts of cell wall polysaccharides in both the noncellulosic and cellulosic fractions during coleoptile growth. JA had no effect on neutral sugar compositions of hemicellulosic polysaccharides but substantially inhibited the IAA-stimulated incorporation of [14C]glucose into noncellulosic and cellulosic polysaccharides. JA-induced inhibition of growth was completely prevented by pretreating segments with 30 mm sucrose for 4 h before the addition of IAA. The endogenous levels of UDP-sugars, which are key intermediates for the synthesis of cell wall polysaccharides, were not reduced significantly by JA. Although these observations suggest that the inhibitory mode of action of JA associated with the growth of oat coleoptile segments is relevant to sugar metabolism during cell wall polysaccharide synthesis, the precise site of inhibition remains to be investigated.
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Abbreviations
- JA:
-
jasmonic acid
- ABA:
-
abscisic acid
- IAA:
-
indoleacetic acid
- T 0 :
-
minimum stress relaxation time
- TFA:
-
trifluoroacetic acid
- TCA:
-
trichloroacetic acid
- HPLC:
-
high-performance liquid chromatography
- EtOAc:
-
ethyl acetate
- TLC:
-
thin-layer chromatography
- JA-Me:
-
methyl jasmonate
- GLC-SIM:
-
gas-liquid chromatography-selected ion monitoring
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Ueda, J., Miyamoto, K. & Kamisaka, S. Inhibition of the synthesis of cell wall polysaccharides in oat coleoptile segments by jasmonic acid: Relevance to its growth inhibition. J Plant Growth Regul 14, 69–76 (1995). https://doi.org/10.1007/BF00203116
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DOI: https://doi.org/10.1007/BF00203116