Influence of salinity on root hydraulic properties of three olive varieties

B. Rewald, C. Leuschner, Z. Wiesman, J. E. Ephrath

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Three varieties of olive, Barnea, Arbequina and Proline, varying in salt tolerance, were examined to check the sensitivity of their root system hydraulic properties to salinity. Up to three levels of saline water (EC = 1.2, 4.2 and 7.5 dS m-1) were used for long-term irrigation of mature trees. Specific conductivities and embolism rates of roots and branches were estimated by low-pressure conductivity measurement; variability and plasticity of root and branch axial conductivities were calculated. Cross-sections of roots were analysed with respect to xylem anatomy. Barnea, and to a minor degree Arbequina, were found to be more salt-resistant than Proline. Axial root hydraulics under salt stress reacted in a more plastic fashion than branch conductivities. Increased specific conductivities of roots, different plasticities of root hydraulics and modifications in mean conduit diameters can be dismissed as foremost reasons of the observed differences in salt resistance. Instead, a high withinpopulation variability in root conductivity, as found in the salt-tolerant Barnea and Arbequina varieties, coming to full effect in high conductivity roots of Barnea trees, and an increased bimodal distribution of conduit sizes may represent favourable traits to enhance water uptake in soils with heterogeneous salinity.

Original languageEnglish
Pages (from-to)12-22
Number of pages11
JournalPlant Biosystems
Volume145
Issue number1
DOIs
StatePublished - 1 Mar 2011

Keywords

  • Axial conductivity
  • Fine and coarse roots
  • Hydraulic variability
  • Olea europaea
  • Photosynthetic rate
  • Salt stress

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science

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