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פותח על ידי קלירמאש פתרונות בע"מ -
Effects of salinization on nutrient transport to lettuce leaves: Consideration of leaf developmental stage
Year:
1999
Source of publication :
New Phytologist
Authors :
ברנשטיין, נירית
;
.
Volume :
144
Co-Authors:
Lazof, D.B., Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, United States
Bernstein, N., Inst. Soils, Water and Environ. Sci., The Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Facilitators :
From page:
85
To page:
94
(
Total pages:
10
)
Abstract:
Most recent reviews of plant salinity response have included the concept of a nutritional disturbance as one likely mechanism by which shoot growth might be inhibited. None the less, few studies of dicotyledonous plants have presented data on nutrient transport into the most intensively growing shoot tissues. In this paper net nutrient deposition was followed for 3 d in 8 sequential, growing leaves of Lactuca sativa, which were grown either in conditions of moderate salinization, or in a growth-stimulating concentration of NaCl. The nutrient deposition was studied from 0.7 to 3.7 d following completion of stepwise salinization. This deposition was followed in immature leaves, which had attained only 1-2% of ultimate leaf mass by the completion of the study. In such young leaves development is still dominated by cell division. The transport of Ca2+ specifically to the youngest leaves was reduced by more than twice as much as was K+ transport. Transport of the other major divalent cationic nutrient, Mg2+2, was not decreased for these leaves. The factors of increase for Na+ and Cl- after 3.7 d after completion of salinization averaged 152 and 62% over control levels for the three youngest leaves (for Na+ and Cl-, respectively). Though significant, these increases were only 27 and 14% as great as increases in three leaf sets of more developed growing leaves. Decreases in net K+ deposition and leaf K+ concentration were not greater for the youngest than they were for the oldest leaves. Net S deposition was reduced 44% more in younger than older growing leaves, but for most leaves not beyond the level expected due to reduced sink strength. The reduction in net P deposition also seemed more related to reduced sink strength, but was reduced to approx. 50% in both younger and more developed growing leaves. While Fe concentration was not reduced by salinization at any developmental stage, Zn2+ net transport and Zn concentration were both reduced in the two youngest leaves (57 and 70%, respectively). Given the moderate treatment imposed (Na: Ca ratio of 22) the results suggest that Ca2+ transport to the youngest leaves is probably highly sensitive to salinization of the root medium and is perhaps a key physiological response in the inhibition of leaf growth.
Note:
Related Files :
calcium
Lactuca sativa
Lactuca sativa (lettuce)
Leaf development
Leaf growth
Nutrient transport
nutrition
plant development
salinity
עוד תגיות
תוכן קשור
More details
DOI :
10.1046/j.1469-8137.1999.00487.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
24081
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:04
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Scientific Publication
Effects of salinization on nutrient transport to lettuce leaves: Consideration of leaf developmental stage
144
Lazof, D.B., Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, United States
Bernstein, N., Inst. Soils, Water and Environ. Sci., The Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Effects of salinization on nutrient transport to lettuce leaves: Consideration of leaf developmental stage
Most recent reviews of plant salinity response have included the concept of a nutritional disturbance as one likely mechanism by which shoot growth might be inhibited. None the less, few studies of dicotyledonous plants have presented data on nutrient transport into the most intensively growing shoot tissues. In this paper net nutrient deposition was followed for 3 d in 8 sequential, growing leaves of Lactuca sativa, which were grown either in conditions of moderate salinization, or in a growth-stimulating concentration of NaCl. The nutrient deposition was studied from 0.7 to 3.7 d following completion of stepwise salinization. This deposition was followed in immature leaves, which had attained only 1-2% of ultimate leaf mass by the completion of the study. In such young leaves development is still dominated by cell division. The transport of Ca2+ specifically to the youngest leaves was reduced by more than twice as much as was K+ transport. Transport of the other major divalent cationic nutrient, Mg2+2, was not decreased for these leaves. The factors of increase for Na+ and Cl- after 3.7 d after completion of salinization averaged 152 and 62% over control levels for the three youngest leaves (for Na+ and Cl-, respectively). Though significant, these increases were only 27 and 14% as great as increases in three leaf sets of more developed growing leaves. Decreases in net K+ deposition and leaf K+ concentration were not greater for the youngest than they were for the oldest leaves. Net S deposition was reduced 44% more in younger than older growing leaves, but for most leaves not beyond the level expected due to reduced sink strength. The reduction in net P deposition also seemed more related to reduced sink strength, but was reduced to approx. 50% in both younger and more developed growing leaves. While Fe concentration was not reduced by salinization at any developmental stage, Zn2+ net transport and Zn concentration were both reduced in the two youngest leaves (57 and 70%, respectively). Given the moderate treatment imposed (Na: Ca ratio of 22) the results suggest that Ca2+ transport to the youngest leaves is probably highly sensitive to salinization of the root medium and is perhaps a key physiological response in the inhibition of leaf growth.
Scientific Publication
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