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Elongation growth in leaf blades of Chloris gayana under saline conditions

Abstract
In Chloris gayana, salinity-associated yield decreases are due mainly to leaf area reductions. To understand the physiological basis for such reduction, the effects of salinity were studied on the spatial and temporal distribution of extension in the intercalary meristem at the leaf base, and on hydraulic conductance in that zone. C. gayana plants were grown on sand irrigated with Hoagland solution with the addition of 0 or 200 mmol/L NaCl, and all [ver mas...]
In Chloris gayana, salinity-associated yield decreases are due mainly to leaf area reductions. To understand the physiological basis for such reduction, the effects of salinity were studied on the spatial and temporal distribution of extension in the intercalary meristem at the leaf base, and on hydraulic conductance in that zone. C. gayana plants were grown on sand irrigated with Hoagland solution with the addition of 0 or 200 mmol/L NaCl, and all measurements were performed on tiller leaf four. In salinised plants, that leaf was 20 percnt; shorter than in controls. Extension in the blade expansion zone was studied by pricking through the leaf sheaths and analysing the displacement of the pricks. In salt-treated plants, maximum growth rates were depressed by 53 percnt; and the growth zone was shorter by approximately 10 mm, nevertheless, extension proceeded for a longer period than in control plants. The analysis of specific leaf areas in the expansion zone suggests the rate of dry matter deposition was lowered by salinity and estimations of tissue displacement time within that zone suggest cell wall maturity was delayed. Hydraulic conductance was reduced by salinity and this may be the main cause for reduced growth under salinity in Chloris gayana. [Cerrar]
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Author
Ortega, Leandro Ismael;   Taleisnik, Edith;  
Fuente
Journal of Plant Physiology 160 (5) : 517-522 (2003)
Date
2003
Editorial
Elsevier
ISSN
0176-1617
URI
http://hdl.handle.net/20.500.12123/7463
https://www.sciencedirect.com/science/article/pii/S0176161704704320
DOI
https://doi.org/10.1078/0176-1617-00827
Formato
pdf
Tipo de documento
artículo
Palabras Claves
Chloris gayana; Estrés Osmótico; Osmotic Stress; Desarrollo Foliar; Leaf Development; Rendimiento; Yields; Salinidad; Salinity; Grama Rhodes; Rhodes Grass; Estrés Salino;
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Excepto donde se diga explicitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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