Inhibition of activity of the ethylene-forming enzyme by α(p-chlorophenoxy)isobutyric acid

Tova Trebitsh, Joseph Riov

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


α(p-Chlorophenoxy)isobutyric acid (PCIB) inhibited indole-3-acetic acid (IAA)-induced ethylene production in etiolated mung bean hypocotyl sections. The endogenous level of 1-aminocyclopropane-1-carboxylic acid (ACC) was not significantly affected by PCIB, indicating that PCIB exerted its effect primarily by inhibiting the activity of the ethylene-forming enzyme (EFE). This conclusion was supported by the observations that PCIB inhibited the conversion of exogenously applied ACC to ethylene. The inhibitory effect of PCIB was already evident with 0.05 mM PCIB, and it increased with time after application of the inhibitor. PCIB also significantly inhibited ethylene production in apple fruit tissues, but it only slightly reduced the level of endogenous ACC. Similar to mung bean, EFE activity in apple tissue was significantly inhibited by PCIB. The possibility that PCIB also inhibits auxin-induced ACC synthase activity is discussed.

Original languageEnglish
Pages (from-to)207-215
Number of pages9
JournalJournal of Plant Growth Regulation
Issue number4
StatePublished - 1 Dec 1987
Externally publishedYes

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science


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