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- W2102966411 abstract "Yield stress threshold (Y) and volumetric extensibility (θ) are the rheological properties that appear to control root growth. In this study they were measured in wheat roots by means of parallel measurement of the growth rate (r) of intact wheat roots and of the turgor pressures (P) of individual cells within the expansion zone. Growth and turgor pressure were manipulated by immersion in graded osmoticum (mannitol) solutions. Turgor was measured with a pressure probe and growth rate by visual observation. The influence of various growth conditions on Y and θ was investigated; (a) At 27 °C.In 0.5 mol m−3 CaCl2r, P, Y and θ were 20.7±4.6 μm min−1, 0.77±0.05 MPa, 0.07±0.03 MPa and 26±1.9 μm min−1 MPa−1 (expressed as increase in length), respectively. Following 24 h growth in 10 mol m−3 KC1 these parameters became 12.3±3.5 μm min−1, 0.72±0.04 MPa, 0.13±0.01 MPa and 21±0.7 μm min−1 MPa−1. After 24 h osmotic adjustment in 150 mol m−3 mannitol/0.5 mol m−3 CaCl2r= 19.6±4.2 μm min−1, P = 0.68±0.05 MPa and Y and θ were 0.07±0.04 MPa and 30±0.2 μm min−1 MPa−01, respectively. After 24 h growth in 350 mol m−3 mannitol/0.5 mol m−3 CaCl2r= 13.3±4.1 μm min−1, P= 0.58±0.07 MPa, Y=0.12±0.01 MPa and ø 32±0.2 tim min−1 MPa−1. During osmotic adjustment in 200 mol m−3 mannitol/0.5 mol m−3 CaCl2, with or without KCl, the recovery of growth rate corresponded to turgor pressure recovery (t1/2 approximately 3 h). (b) At 15 °C. Lowered temperature dramatically influenced the growth parameters which became r= 8.3±2.8 um min−1, P=0.78 MPa, r=<0.2 MPa and θ=15±0.1 μm min−1 MPa−1. Therefore, Y and θ are influenced by 10 mol m−3 K+ ions and low temperature. In each case the effective pressure for growth (P-Y) was large indicating that small fluctuations of soil water potential will not stop root elongation." @default.
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- W2102966411 date "1990-01-01" @default.
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- W2102966411 title "Measurement of Yield Threshold and Cell Wal Extensibility of Intact Wheat Roots under Different Ionic, Osmotic and Temperature Treatments" @default.
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- W2102966411 doi "https://doi.org/10.1093/jxb/41.6.669" @default.
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