Physical extensibility of maize coleoptile cell walls: apparent plastic extensibility is due to elastic hysteresis

These results show that the creep test estimates the viscoelastic properties rather than the plastic properties of the wall

M. Hohl

2004

Scholarcy highlights

  • Segments of maize coleoptiles demonstrate plastic cell-wall extensibility as operationally defined by the amount of irreversible strain elicited by stretching living or frozen-thawed tissue under constant load in an extensiometer
  • Changes of Epl are correlated with auxin- and abscisic-acid-dependent growth responses and have been causally related to hormone-controlled cell-wall loosening
  • Auxin induces an increase of Epl in the outer epidermal wall of maize coleoptiles which is considered as the growth-limiting wall of the organ
  • Auxin-treatment of segments leads to a deformation of the hysteresis loop, thereby giving rise to an increase of Epl
  • These results show that the creep test estimates the viscoelastic properties rather than the plastic properties of the wall
  • Physical extensibility of maize coleoptile cell walls: apparent plastic extensibility is due to elastic hysteresis

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