Photomodulation of mesocotyl elongation in maize seedlings: Is there a correlative relationship between phytochrome, auxin and cell wall extensibility?

A. Yahalom, B. L. Epel, Z. Glinka*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Three h white light irradiation of etiolated maize seedlings (Zea mays L. cv. Jubilee) inhibited mesocotyl elongation and caused a sharp decrease in cell wall plastic extensibility as measured by the Instron technique. The plastic extensibility following white light irradiation (3 h) was photomodulated by phytochrome. Although the photomodulation of the plastic extensibility was correlated with growth during 20 h, no such correlation was observed at shorter times. The addition of indole‐3‐acetic acid to light‐inhibited intact seedlings, or seedlings from which the coleoptile and inner leaves were excised, resulted in a stimulation of growth. However, none of the IAA concentrations could reverse light inhibition. The possibility of a correlative relationship between phytochrome, auxin and cell wall extensibility is discussed.

Original languageEnglish
Pages (from-to)428-433
Number of pages6
JournalPhysiologia Plantarum
Volume72
Issue number2
DOIs
StatePublished - Feb 1988

Keywords

  • Instron
  • Zea mays
  • auxin
  • cell wall extensibility
  • coleoptile
  • maize
  • photomodulation
  • phytochrome
  • plastic extensibility

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