caa a22 4500 397521138 CHVBK 20180308164633.0 cr unu---uuuuu 161202e199505 xx s 000 0 eng 10.1093/jxb/46.5.557 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.5.557 Root growth and nitrate uptake by wheat (Triticum aestivum L.) following wetting of dry surface soil [Elektronische Daten] [D.J. Brady, C.L. Wenzel, I.R.P. Fillery, P.J. Gregory] The nitrate uptake capacity of surface roots of spring wheat (Triticum aestivum L. cv. Kulin) was investigated following wetting of dry surface soil. Plants were grown to stem elongation stage with adequate watering at depth while the surface soil was allowed to dry. Eight weeks after sowing, water or a 15N-nitrate solution was added to the surface soil to simulate rainfall. Root growth and nitrate uptake were measured up to 4 d after wetting on plants with unconfined nodal root growth and on plants with the majority of nodal roots confined within small vials. Prior to wetting, plants from both nodal treatments had seminal roots with collapsed cortices along the upper 10 cm and many short, viable lateral roots. Nodal roots, where present, were only a few cm long and unbranched. Only plants with unconfined nodal roots were able to take up nitrate within the 24 h before any new root growth. By 2 d after wetting there was significant growth of the seminal lateral roots, and rapid growth and branching of nodal roots. From 2 d after wetting, plants with confined nodal roots also took up nitrate, presumably due to the growth of the seminal lateral roots. Hence it appears as though the nodal roots in the unconfined treatment could immediately take up nitrate, but the seminal roots required new lateral root growth to become active in nitrate uptake. The plants with confined nodal roots had a lower nitrate uptake than those with unconfined nodal roots 4 d after wetting, indicating that the seminal root system was not able to compensate for lack of nodal roots. Insufficient nitrate was taken up after 4 d, by plants from either nodal root treatment, to increase the shoot N concentration significantly. © Oxford University Press Research Papers nationallicence Triticum aestivum nationallicence nitrate uptake nationallicence drought nationallicence seminal roots nationallicence nodal roots nationallicence Brady D.J. CSIRO Division of Plant Industry Wembley, WA 6014, Australia aut Wenzel C.L. Co-operative Research Centre for Plant Science GPO Box 475, Canberra, ACT 2601, Australia aut Fillery I.R.P. CSIRO Division of Plant Industry Wembley, WA 6014, Australia aut Gregory P.J. Department of Soil Science, The University of Reading Whiteknights, PO Box 233, Reading RG6 2DW, UK aut Journal of Experimental Botany Oxford University Press 46/5(1995-05), 557-564 0022-0957 46:5<557 1995 46 exbotj https://doi.org/10.1093/jxb/46.5.557 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.5.557 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Brady D.J. CSIRO Division of Plant Industry Wembley, WA 6014, Australia aut NATIONALLICENCE 700 1- Wenzel C.L. Co-operative Research Centre for Plant Science GPO Box 475, Canberra, ACT 2601, Australia aut NATIONALLICENCE 700 1- Fillery I.R.P. CSIRO Division of Plant Industry Wembley, WA 6014, Australia aut NATIONALLICENCE 700 1- Gregory P.J. Department of Soil Science, The University of Reading Whiteknights, PO Box 233, Reading RG6 2DW, UK aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/5(1995-05), 557-564 0022-0957 46:5<557 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford