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 language | English |
|---|---|
| Pages (from-to) | 283-289 |
| Number of pages | 7 |
| Journal | International Journal of Botany |
| Volume | 4 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2008 |
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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 journal › Article
}
TY - JOUR
T1 - Drought adaptation confers short-term but not long-term salt tolerance in cocksfoot, Dactylis glomerata
AU - Zadeh, Ahmad Abdol
AU - Shima, Kazuto
AU - Veneklaas, Erik J.
AU - Chiba, Kyozo
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
KW - Dactylis glomerata
KW - Ion accumulation
KW - Salinity
KW - Water relation
KW - Xylem sap
UR - http://www.scopus.com/inward/record.url?scp=53949111603&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=53949111603&partnerID=8YFLogxK
U2 - 10.3923/ijb.2008.283.289
DO - 10.3923/ijb.2008.283.289
M3 - Article
AN - SCOPUS:53949111603
VL - 4
SP - 283
EP - 289
JO - International Journal of Botany
JF - International Journal of Botany
SN - 1811-9700
IS - 3
ER -