Effect of auxin and abscisic acid on cell wall extensibility in maize coleoptiles

Plastic and elastic in-vitro extensibilities of cell walls from growing maize coleoptile segments were measured by stretching frozen-thawed tissue, pre-extended to its in-vivo length, at constant force in a custom-buildt extensiometer, equipped with a linear-displacement transducer

U. Kutschera

2004

Scholarcy highlights

  • Plastic and elastic in-vitro extensibilities of cell walls from growing maize coleoptile segments were measured by stretching frozen-thawed tissue, pre-extended to its in-vivo length, at constant force in a custom-buildt extensiometer, equipped with a linear-displacement transducer
  • Abscisic acid inhibits segment growth induced by auxin, fusicoccin, or exogenous acid, and this effect can be quantitatively attributed to an ABA-mediated reduction of cell wall extensibility as determined by the ΔEplmeasurement
  • indole-3-acetic acid and ABA have no effect on total protein synthesis, RNA synthesis, and amount of osmotic solutes
  • Fusicoccin-induced proton excretion is only slightly inhibited by ABA
  • ΔEelis not affected by either IAA, ABA, or CHI
  • We further draw the conclusion that IAA and ABA control of cell growth can entirely be attributed to a modulation of cell wall extensibility by these hormones in maize coleoptiles

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