Mechanism of rapid suppression of cell expansion in cucumber hypocotyls after blue-light irradiation

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

Rapid suppression of hypocotyl elongation by blue light in cucumber (Cucumis sativus L.) was studied to examine possible hydraulic and wall changes responsible for diminished growth. Cell-sap osmotic pressure, measured by vaporpressure osmometry, was not decreased by blue light; turgor pressure, measured by the pressureprobe technique, remained constant during the growth inhibition; and stem hydraulic conductance, measured by dynamic and static methods, was likewise unaffected by blue light. Wall yielding properties were assessed by the pressure-block technique for in-vivo stress relaxation. Blue light reduced the initial rate of relaxation by 77%, but had little effect on the final amount of relaxation. The results demonstrate that blue irradiation acts to decrease the wall yielding coefficient, but not the yield threshold. Stress-strain (Instron) analysis showed that irradiation of the seedlings had little effect on the mechanical extensibilities of the isolated wall. The results indicate that blue light can reduce cell-wall loosening without affecting bulk viscoelastic properties, and indicate a chemorheological mechanism of cell-wall expansion.

Original languageEnglish (US)
Pages (from-to)109-116
Number of pages8
JournalPlanta
Volume176
Issue number1
DOIs
StatePublished - Nov 1 1988

All Science Journal Classification (ASJC) codes

  • Genetics
  • Plant Science

Fingerprint Dive into the research topics of 'Mechanism of rapid suppression of cell expansion in cucumber hypocotyls after blue-light irradiation'. Together they form a unique fingerprint.

Cite this