TY - JOUR

T1 - Root development impacts on the distribution of phosphatase activity

T2 - Improvements in quantification using soil zymography

AU - Giles, C.D.

AU - Dupuy, L.

AU - Boitt, G.

AU - Brown, L.K.

AU - Condron, L.M.

AU - Darch, T.

AU - Blackwell, M.S.A.

AU - Menezes-Blackburn, D.

AU - Shand, C.A.

AU - Stutter, M.I.

AU - Lumsdon, D.G.

AU - Wendler, R.

AU - Cooper, P.

AU - Wearing, C.

AU - Zhang, H.

AU - Haygarth, P.M.

AU - George, T.S.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Abstract Zymographic methods for the 2D distribution of phosphatase activity in soils have markedly advanced our understanding of root-soil-microbiota interactions. Robust quantitative approaches for 2D assays, which use 4-methylubelliferyl phosphate (4-MUP), are needed to advance a mechanistic understanding of enzyme behaviour and distribution in soils. We present improvements to the method for phosphatase zymography in rhizobox studies, involving (1) a systematic evaluation of 4-methylumbelliferone (4-MU)-based calibration functions in relation to image exposure time and (2) the development of advanced image analysis tools for lateral and longitudinal distributions of phosphatase activity along barley roots (Hordeum vulgare L., cv Optic). Exposure time (<1–32 s) affected the slope and intercept of 4-MU calibration equations by 4.4- and 5.8-fold, respectively. In lateral root profiles, a linear relationship was found between phosphatase activity and root hair length at 0 cm (7 nKat mm-2), 0.2 cm (48 nKat mm−2), and 2 cm (234 nKat mm−2) distance from the root tips (r = 0.9795, p < 0.0001); an algorithm designed to optimise estimates of phosphatase activity longitudinally confirmed this relationship (r = 0.9462, p < 0.0001). To improve the precision and accuracy of fluorescence-based soil zymography, careful control of calibration and imaging conditions and further development of advanced image analysis techniques are recommended.

AB - Abstract Zymographic methods for the 2D distribution of phosphatase activity in soils have markedly advanced our understanding of root-soil-microbiota interactions. Robust quantitative approaches for 2D assays, which use 4-methylubelliferyl phosphate (4-MUP), are needed to advance a mechanistic understanding of enzyme behaviour and distribution in soils. We present improvements to the method for phosphatase zymography in rhizobox studies, involving (1) a systematic evaluation of 4-methylumbelliferone (4-MU)-based calibration functions in relation to image exposure time and (2) the development of advanced image analysis tools for lateral and longitudinal distributions of phosphatase activity along barley roots (Hordeum vulgare L., cv Optic). Exposure time (<1–32 s) affected the slope and intercept of 4-MU calibration equations by 4.4- and 5.8-fold, respectively. In lateral root profiles, a linear relationship was found between phosphatase activity and root hair length at 0 cm (7 nKat mm-2), 0.2 cm (48 nKat mm−2), and 2 cm (234 nKat mm−2) distance from the root tips (r = 0.9795, p < 0.0001); an algorithm designed to optimise estimates of phosphatase activity longitudinally confirmed this relationship (r = 0.9462, p < 0.0001). To improve the precision and accuracy of fluorescence-based soil zymography, careful control of calibration and imaging conditions and further development of advanced image analysis techniques are recommended.

KW - Barley

KW - Image analysis

KW - 4-Methylumbelliferone

KW - Phosphatase

KW - Rhizosphere

KW - Soil zymography

U2 - 10.1016/j.soilbio.2017.08.011

DO - 10.1016/j.soilbio.2017.08.011

M3 - Journal article

VL - 116

SP - 158

EP - 166

JO - Soil Biology and Biochemistry

JF - Soil Biology and Biochemistry

SN - 0038-0717

ER -