Inhibition of brassinosteroid‐induced epinasty in tomato plants by aminooxyacetic acid and Co2+

Carl D. Schlagnhaufer, Richard N. Arteca

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Abstract

The inhibitory effects of aminooxyacetic acid (AOA) and cobalt chloride (CoCl2) on brassinosteroid (BR)‐induced epinasty in tomato plants (Lycopersicon esculentum Mill. cv. Heinz 1350) are evaluated. CoCl2 dramatically decreases petiole bending and ethylene production as the concentration increases from 50 to 200 μM. The content of 1‐aminocyclopropane‐1‐carboxylic acid (ACC) in the petiole, instead of accumulating, is reduced and does not change over the concentration range tested. Inhibition of BR‐induced epinasty by AOA results from inhibition of ACC synthesis. There are dramatic reductions in petiole bending, ethylene and ACC production as the concentration of AOA is increased from 50 to 200 μM. Maximum inhibition occurs when the plants are pretreated with the inhibitors. The degree of inhibition increases as the length of pretreatment increases from 1 to 4 h. The response of BR‐treated plants to AOA and CoCl2 is similar to the effect of auxin, indicating the integral relationship between BR and auxin.

Original languageEnglish (US)
Pages (from-to)151-155
Number of pages5
JournalPhysiologia Plantarum
Volume65
Issue number2
DOIs
StatePublished - Jan 1 1985

All Science Journal Classification (ASJC) codes

  • Physiology
  • Genetics
  • Plant Science
  • Cell Biology

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