The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

The short-term growth response to salt of the developing barley leaf

På svenska

Author

  • W Fricke
  • G Akhiyarova
  • WX Wei
  • Erik Alexandersson
  • A Miller
  • Per Kjellbom
  • A Richardson
  • T Wojciechowski
  • L Schreiber
  • D Veselov
  • G Kudoyarova
  • V Volkov
Show all

Summary, in English

Recent results concerning the short-term growth response to salinity of the developing barley leaf are reviewed. Plants were grown hydroponically and the growth response of leaf 3 was studied between 10 min and 5 d following addition of 100 mM NaCl to the root medium. The aim of the experiments was to relate changes in variables that are likely to affect cell elongation to changes in leaf growth. Changes in hormone content (ABA, cytokinins), water and solute relationships (osmolality, turgor, water potential, solute concentrations), gene expression (water channel), cuticle deposition, membrane potential, and transpiration were followed, while leaf elongation velocity was monitored. Leaf elongation decreased close to zero within seconds following addition of NaCl. Between 20 and 30 min after exposure to salt, elongation velocity recovered rather abruptly, to about 46% of the pre-stress level, and remained at the reduced rate for the following 5 d, when it reached about 70% of the level in non-stressed plants. Biophysical and physiological analyses led to three major conclusions. (i) The immediate reduction and sudden recovery in elongation velocity is due to changes in the water potential gradient between leaf xylem and peripheral elongating cells. Changes in transpiration, ABA and cytokinin content, water channel expression, and plasma membrane potential are involved in this response. (ii) Significant solute accumulation, which aids growth recovery, is detectable from 1 h onwards; growing and non-growing leaf regions and mesophyll and epidermis differ in their solute response. (iii) Cuticular wax density is not affected by short-term exposure to salt; transpirational changes are due to stomatal control.

Publishing year

2006

Language

English

Pages

1079-1095

Publication/Series

Journal of Experimental Botany

Volume

57

Issue

5

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Biological Sciences

Keywords

  • solute and water transport
  • leaf development
  • Hordeum vulgare
  • epidermis
  • cytokinin
  • cuticle
  • cell elongation
  • Abscisic acid
  • aquaporin
  • membrane potential

Status

Published

ISBN/ISSN/Other

  • ISSN: 0022-0957