KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Effect of Drought Stress on the Concentration of Nitrogen Metabolites in White Clover

  • Kim, Tae-Hwan (Department of Animal Science & Institute of Agriculture Science and Technology, College of Agriculture, Chonnam National University) ;
  • Lee, Bok-Rye (Department of Animal Science & Institute of Agriculture Science and Technology, College of Agriculture, Chonnam National University) ;
  • Jung, Woo-Jin (Department of Animal Science & Institute of Agriculture Science and Technology, College of Agriculture, Chonnam National University) ;
  • Kim, Dae-Hyun (Department of Animal Science & Institute of Agriculture Science and Technology, College of Agriculture, Chonnam National University) ;
  • Kim, Kil-Yong (Department of Biological & Environmental Chemistry, College of Agriculture, Chonnam National University)
  • Published : 2002.06.01
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Abstract

To investigate the changes in the composition and pool size of nitrogen metabolites under drought stress, white clover (Trifolium repens L.) were exposed to -0.04MPa (well-watered, control) or to -0.12MPa (drought-stressed) of soil water potential during 28 days. Dry weight of leaves in drought-stressed plants was remarkably decreased by 45% and 74% within 14 days and 28 days, respectively, compared with control. For nitrate concentration after 28 days of treatment, a significant difference (1.6 times higher in drought-stressed plants) was observed only in stolon. NH$_3$-NH$_4$$^{+}$ concentration in all three organs of drought-stressed plants linearly increased to more than 1.6 times higher level at 28 day when compared to the initial level (day 0), while the increasing rate in control was much less than that of drought-stressed plants. Proline concentrations in drought-stressed plants remarkably increased and reached to 7, 13 and 17 times higher level at 28 day compared to control. Protein concentration in leaves of drought-stressed plants tended to decrease, while it slightly increased during the first 14 days and reached a plateau afterward in control. There was not significant difference in the proteins concentration of stolon and roots throughout experimental period. On SDS-PAGE analysis, two major proteins specifically induced by drought stress (16-kD and 18-kD) were detected in stolon.n.

Keywords

References

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