Drought adaptation confers short-term but not long-term salt tolerance in cocksfoot, Dactylis glomerata

Ahmad Abdol Zadeh, Kazuto Shima, Erik J. Veneklaas, Kyozo Chiba

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The effects of different levels of NaCl (0, 50, 100 and 150 mM) on growth, water relations, ions accumulation and nitrogen assimilation in two varieties of Dactylis glomerata, i.e., Hispanica from a semi-arid area and Frontier from a temperate climate, were studied in a greenhouse in hydroponic culture. Salinity induced a significant decrease in the growth of both varieties; however, their responses to NaCl stress were different. Based on weight and photosynthesis, Hispanica was found initially to be more resistant to salinity than Frontier. However, over a longer period of salinity treatments, Frontier displayed higher salt tolerance, especially at 50 mM NaCl concentration. The initial resistance to salinity of Hispanica, compared to Frontier, appeared to be related with a greater decrease in transpiration and water potential due to salinity, while there was no change in relative water content, suggesting better osmotic adjustment. In contrast, Frontier demonstrated more exclusion of Na+ and Cl- from the xylem stream and a higher K+/Na + ratio, leading to a less harmful effect of salinity in the shoot, manifesting itself in better growth of this variety over the longer term. The results support the hypothesis that growth response to salinity has two phases. The first phase of growth reduction is mostly due to water (osmotic) stress, with the drought adapted variety, Hispanica, exhibiting higher tolerance. In the second phase, when toxic effects of accumulated Na+ and Cl - in tissues caused growth retardation, Frontier proved to have the higher resistance to salinity.

Original languageEnglish
Pages (from-to)283-289
Number of pages7
JournalInternational Journal of Botany
Volume4
Issue number3
DOIs
Publication statusPublished - 2008

Fingerprint

Dactylis glomerata
salt tolerance
drought
salinity
growth retardation
osmotic stress
temperate zones
hydroponics
water potential
xylem
assimilation (physiology)
transpiration
water
photosynthesis
ions
greenhouses
water content
shoots
nitrogen

Keywords

  • Dactylis glomerata
  • Ion accumulation
  • Salinity
  • Water relation
  • Xylem sap

ASJC Scopus subject areas

  • Plant Science

Cite this

Drought adaptation confers short-term but not long-term salt tolerance in cocksfoot, Dactylis glomerata. / Zadeh, Ahmad Abdol; Shima, Kazuto; Veneklaas, Erik J.; Chiba, Kyozo.

In: International Journal of Botany, Vol. 4, No. 3, 2008, p. 283-289.

Research output: Contribution to journalArticle

Zadeh, Ahmad Abdol ; Shima, Kazuto ; Veneklaas, Erik J. ; Chiba, Kyozo. / Drought adaptation confers short-term but not long-term salt tolerance in cocksfoot, Dactylis glomerata. In: International Journal of Botany. 2008 ; Vol. 4, No. 3. pp. 283-289.
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