A - Papers appearing in refereed journals
Chapman, N., Whalley, W. R., Lindsey, K. and Miller, A. J. 2011. Water supply and not nitrate concentration determines primary root growth in Arabidopsis. Plant, Cell and Environment. 34 (10), pp. 1630-1638.
|Authors||Chapman, N., Whalley, W. R., Lindsey, K. and Miller, A. J.|
Understanding how root system architecture (RSA) adapts to changing nitrogen and water availability is important for improving acquisition. A sand rhizotron system was developed to study RSA in a porous substrate under tightly regulated nutrient supply. The RSA of Arabidopsis seedlings under differing nitrate (NO(3)(-)) and water supplies in agar and sand was described. The hydraulic conductivity of the root environment was manipulated by using altered sand particle size and matric potentials. Ion-selective microelectrodes were used to quantify NO(3)(-) at the surface of growing primary roots in sands of different particle sizes. Differences in RSA were observed between seedlings grown on agar and sand, and the influence of NO(3)(-) (0.1-10.0 mM) and water on RSA was determined. Primary root length (PRL) was a function of water flux and independent of NO(3)(-). The percentage of roots with laterals correlated with water flux, whereas NO(3)(-) supply was important for basal root (BR) growth. In agar and sand, the NO(3)(-) activities at the root surface were higher than those supplied in the nutrient solution. The sand rhizotron system is a useful tool for the study of RSA, providing a porous growth environment that can be used to simulate the effects of hydraulic conductivity on growth.
|Year of Publication||2011|
|Journal||Plant, Cell and Environment|
|Journal citation||34 (10), pp. 1630-1638|
|Digital Object Identifier (DOI)||doi:10.1111/j.1365-3040.2011.02358.x|
|Open access||Published as bronze (free) open access|
|Funder||Biotechnology and Biological Sciences Research Council|
|Funder project or code||SEF|
|Bio-physics of the soil-root interface|
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