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Measurement of a growth‐induced water potential gradient in tall fescue leaves
Author(s) -
MARTRE PIERRE,
BOGEATTRIBOULOT MARIEBEATRICE,
DURAND JEANLOUIS
Publication year - 1999
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.1999.00405.x
Subject(s) - turgor pressure , festuca arundinacea , osmometer , osmotic pressure , elongation , osmoregulation , rubidium , chemistry , botany , growth rate , biophysics , biology , agronomy , poaceae , potassium , chromatography , ecology , salinity , materials science , organic chemistry , ultimate tensile strength , metallurgy , geometry , mathematics
Spatial distribution of cell turgor pressure, cell osmotic pressure and relative elemental growth rate were measured in growing tall fescue leaves ( Festuca arundinacea ). Cell turgor pressure (measured with a pressure probe) was c . 0.55 MPa in expanding cells but increased steeply (+0.3 MPa) in cells where elongation had stopped. However, cell osmotic pressure (measured with a picolitre osmometer) was almost constant at 0.85 MPa throughout the leaf. The water potential difference between the growth zone and the mature zone (0.3 MPa) was interpreted as a growth‐induced water potential gradient. This and further implications for the mechanism of growth control are discussed.