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פותח על ידי קלירמאש פתרונות בע"מ -
Salinity-induced inhibition of leaf elongation in maize is not mediated by changes in cell wall acidification capacity
Year:
2001
Authors :
ברנשטיין, נירית
;
.
נבס-פיאסטון, ביאטריס גלית
;
.
Volume :
125
Co-Authors:
Neves-Piestun, B.G., Inst. of Soil, Water,/Envtl. Sci., Volcani Center, P.O. Box 6, Bet-Dagan 50-250, Israel
Bernstein, N., Inst. of Soil, Water,/Envtl. Sci., Volcani Center, P.O. Box 6, Bet-Dagan 50-250, Israel
Facilitators :
From page:
1419
To page:
1428
(
Total pages:
10
)
Abstract:
The physiological mechanisms underlying leaf growth inhibition under salt stress are not fully understood. Apoplastic pH is considered to play an important role in cell wall loosening and tissue growth and was demonstrated to be altered by several growth-limiting environmental conditions. In this study we have evaluated the possibility that inhibition of maize (Zea mays) leaf elongation by salinity is mediated by changes in growing cell wall acidification capacity. The kinetics of extended apoplast pH changes by leaf tissue of known expansion rates and extent of growth reduction under stress was investigated (in vivo) and was found similar for non-stressed and salt-stressed tissues at all examined apoplast salinity levels (0.1, 5, 10, or 25 mM NaCl). A similar rate of spontaneous acidification for the salt and control treatments was demonstrated also in in situ experiments. Unlike growing cells that acidified the external medium, mature nongrowing cells caused medium alkalinization. The kinetics of pH changes by mature tissue was also unchanged by salt stress. Fusicoccin, an enhancer of plasmalemma H+-ATPase activity level, greatly stimulated elongation growth and acidification rate to a similar extent in the control and salt treatments. That the ability of the growing tissue to acidify the apoplast did not change under same salt stress conditions that induced inhibition of tissue elongation rate suggests that salinity does not inhibit cell growth by impairing the acidification process or reducing the inherent capacity for cell wall acidification.
Note:
Related Files :
Acids
Cell elongation
Glycosides
in vivo study
pH
Plant Cell
Plant Leaves
salinity
salt stress
Zea mays
עוד תגיות
תוכן קשור
More details
DOI :
10.1104/pp.125.3.1419
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
21521
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:44
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Scientific Publication
Salinity-induced inhibition of leaf elongation in maize is not mediated by changes in cell wall acidification capacity
125
Neves-Piestun, B.G., Inst. of Soil, Water,/Envtl. Sci., Volcani Center, P.O. Box 6, Bet-Dagan 50-250, Israel
Bernstein, N., Inst. of Soil, Water,/Envtl. Sci., Volcani Center, P.O. Box 6, Bet-Dagan 50-250, Israel
Salinity-induced inhibition of leaf elongation in maize is not mediated by changes in cell wall acidification capacity
The physiological mechanisms underlying leaf growth inhibition under salt stress are not fully understood. Apoplastic pH is considered to play an important role in cell wall loosening and tissue growth and was demonstrated to be altered by several growth-limiting environmental conditions. In this study we have evaluated the possibility that inhibition of maize (Zea mays) leaf elongation by salinity is mediated by changes in growing cell wall acidification capacity. The kinetics of extended apoplast pH changes by leaf tissue of known expansion rates and extent of growth reduction under stress was investigated (in vivo) and was found similar for non-stressed and salt-stressed tissues at all examined apoplast salinity levels (0.1, 5, 10, or 25 mM NaCl). A similar rate of spontaneous acidification for the salt and control treatments was demonstrated also in in situ experiments. Unlike growing cells that acidified the external medium, mature nongrowing cells caused medium alkalinization. The kinetics of pH changes by mature tissue was also unchanged by salt stress. Fusicoccin, an enhancer of plasmalemma H+-ATPase activity level, greatly stimulated elongation growth and acidification rate to a similar extent in the control and salt treatments. That the ability of the growing tissue to acidify the apoplast did not change under same salt stress conditions that induced inhibition of tissue elongation rate suggests that salinity does not inhibit cell growth by impairing the acidification process or reducing the inherent capacity for cell wall acidification.
Scientific Publication
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