A protective role for the polyamine spermine against drought stress in Arabidopsis

Koji Yamaguchi, Yoshihiro Takahashi, Thomas Berberich, Akihiko Imai, Taku Takahashi, Anthony J. Michael, Tomonobu Kusano

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194 Citations (Scopus)

Abstract

Cellular polyamine content often changes in response to abiotic stresses. However, its physiological relevance is unknown. We found that an Arabidopsis mutant plant (acl5/spms), which cannot produce spermine, is hypersensitive to high salt. Examination of drought sensitivity of the mutant and comparison with wild type plants indicated hypersensitivity to drought. This phenotype was cured by spermine pretreatment but not by the other polyamines putrescine and spermidine, suggesting that drought-hypersensitivity exhibited by the mutant is due to spermine deficiency. The water loss rate of wild type and mutant plants were similar until 20 min after onset of dehydration stress, but after a longer exposure the rate in mutant plants was higher than in wild type plants. Consistent with this result, the stomata of the mutant leaves remained open while in wild type leaves they closed. Based on the collected data, we discuss a role for spermine in response to drought stress.

Original languageEnglish
Pages (from-to)486-490
Number of pages5
JournalBiochemical and Biophysical Research Communications
Volume352
Issue number2
DOIs
Publication statusPublished - Jan 12 2007

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Keywords

  • Arabidopsis thaliana
  • Calcium homeostasis
  • Drought-stress
  • Polyamine
  • Spermine
  • Stomata

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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