חיפוש מתקדם
Planta
Bernstein, N., Department of Land Air and Water Resources, University of California, Davis, 95616, CA, United States
Silk, W.K., Department of Land Air and Water Resources, University of California, Davis, 95616, CA, United States
Läuchli, A., Department of Land Air and Water Resources, University of California, Davis, 95616, CA, United States
Elevated concentrations of NaCl in plant growth media cause a reduction in leaf growth. In grasses, where the leaf growth zone is a small part of the entire leaf, it is important to locate the expanding region and spatially quantify the extent of growth reduction under stress. This will allow comparisons and correlations with possible physiologically important factors. We studied the spatial distribution of growth within the intercalary growth zone of sorghum (Sorghum bicolor [L.] Moench, cv. NK 265) leaves. Salinity (100 mM NaCl) shortened the length of the growth zone from 30 mm in the controls to about 24 mm, and reduced the maximal relative elemental growth rate (REG rate). The extent of growth inhibition varied with spatial location along the elongation region. The growth in the basal 3-9 mm of salinized plants was not affected. Young leaves, while still enclosed in the protected whorl of older sheaths and elongating rapidly, were affected more severely by the stress than emerged leaves. The distribution of growth along the leaf growth zone was not steady throughout the elongation period. The length of the elongation region of young nonemerged leaves increased with leaf age and reached a maximum of about 30 mm at leaf emergence. Toward the end of the elongation period, the growth zone shortened for both the control and salinized leaves, and was confined to more basal regions. The maximal REG rate increased after leaf emergence, the increase being larger in control than salinized leaves. Toward the end of the elongation period, when growth was no longer linear with respect to time, the maximum REG rate decreased and its position shifted closer to the leaf base. Growth profiles of leaves 8, 9 and 10 were similar in both control and salinized plants. This suggests that within that time frame of plant development, successive leaves are similarly affected by the stress, and that the length of time the plant was exposed to a steady level of salinity plays no role in specific leaf inhibition. © 1993 Springer-Verlag.
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תנאי שימוש
Growth and development of sorghum leaves under conditions of NaCl stress - Spatial and temporal aspects of leaf growth inhibition
191
Bernstein, N., Department of Land Air and Water Resources, University of California, Davis, 95616, CA, United States
Silk, W.K., Department of Land Air and Water Resources, University of California, Davis, 95616, CA, United States
Läuchli, A., Department of Land Air and Water Resources, University of California, Davis, 95616, CA, United States
Growth and development of sorghum leaves under conditions of NaCl stress - Spatial and temporal aspects of leaf growth inhibition
Elevated concentrations of NaCl in plant growth media cause a reduction in leaf growth. In grasses, where the leaf growth zone is a small part of the entire leaf, it is important to locate the expanding region and spatially quantify the extent of growth reduction under stress. This will allow comparisons and correlations with possible physiologically important factors. We studied the spatial distribution of growth within the intercalary growth zone of sorghum (Sorghum bicolor [L.] Moench, cv. NK 265) leaves. Salinity (100 mM NaCl) shortened the length of the growth zone from 30 mm in the controls to about 24 mm, and reduced the maximal relative elemental growth rate (REG rate). The extent of growth inhibition varied with spatial location along the elongation region. The growth in the basal 3-9 mm of salinized plants was not affected. Young leaves, while still enclosed in the protected whorl of older sheaths and elongating rapidly, were affected more severely by the stress than emerged leaves. The distribution of growth along the leaf growth zone was not steady throughout the elongation period. The length of the elongation region of young nonemerged leaves increased with leaf age and reached a maximum of about 30 mm at leaf emergence. Toward the end of the elongation period, the growth zone shortened for both the control and salinized leaves, and was confined to more basal regions. The maximal REG rate increased after leaf emergence, the increase being larger in control than salinized leaves. Toward the end of the elongation period, when growth was no longer linear with respect to time, the maximum REG rate decreased and its position shifted closer to the leaf base. Growth profiles of leaves 8, 9 and 10 were similar in both control and salinized plants. This suggests that within that time frame of plant development, successive leaves are similarly affected by the stress, and that the length of time the plant was exposed to a steady level of salinity plays no role in specific leaf inhibition. © 1993 Springer-Verlag.
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