caa a22 4500 606219234 CHVBK 20210128101117.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s11104-015-2413-9 doi (NATIONALLICENCE)springer-10.1007/s11104-015-2413-9 Dynamic root responses to drought and rewatering in two wheat ( Triticum aestivum ) genotypes [Elektronische Daten] [Sebastian Steinemann, Zhanghui Zeng, Alan McKay, Sigrid Heuer, Peter Langridge, Chun Huang] Background and aims: In Mediterranean-type environments, effective capture of intermittent rainfall is important for crop drought tolerance. Two wheat genotypes RAC875 and Kukri differing in drought tolerance vary in several shoot traits and grain yield. Little is known about root traits contributing to drought tolerance. This study examined dynamic root responses to cyclic drought in these two contrasting genotypes. Methods: A pot experiment was conducted by exposing plants to moderate drought before heading, and then rewatering. Root responses were determined for coarse and fine root length density (RLD), root DNA concentration (RDC), nodal root properties, and metaxylem and protoxylem features of both primary and nodal roots in proximal and distal regions. Results: Moderate drought reduced fine RLD and inhibited new nodal root growth. Rewatering promoted new nodal root growth. Drought-tolerant RAC875 showed higher relative growth of newly emerged nodal roots than drought-intolerant Kukri after rewatering. RAC875 also had smaller diameter and total area of metaxylem vessels in nodal roots than Kukri, but higher number of metaxylem vessels and RDC independent of water regime. Conclusions: Multiple root traits identified could confer RAC875 advantage in drought tolerance under Mediterranean-type environments through conservative use of water and reduced risk of embolism, rapid responses to rainfall and root survival. Springer International Publishing Switzerland, 2015 Drought nationallicence Metaxylem nationallicence Nodal roots nationallicence Primary roots nationallicence Protoxylem nationallicence Rewatering nationallicence Steinemann Sebastian Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut Zeng Zhanghui Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut McKay Alan Plant and Soil Health, South Australian Research and Development Institute, GPO Box 397, 5001, Adelaide, SA, Australia aut Heuer Sigrid Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut Langridge Peter Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut Huang Chun Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut Plant and Soil Springer International Publishing 391/1-2(2015-06-01), 139-152 0032-079X 391:1-2<139 2015 391 11104 https://doi.org/10.1007/s11104-015-2413-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2413-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Steinemann Sebastian Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut NATIONALLICENCE 700 1- Zeng Zhanghui Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut NATIONALLICENCE 700 1- McKay Alan Plant and Soil Health, South Australian Research and Development Institute, GPO Box 397, 5001, Adelaide, SA, Australia aut NATIONALLICENCE 700 1- Heuer Sigrid Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut NATIONALLICENCE 700 1- Langridge Peter Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut NATIONALLICENCE 700 1- Huang Chun Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, the University of Adelaide, Waite Campus, PMB1, 5064, Glen Osmond, SA, Australia aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 391/1-2(2015-06-01), 139-152 0032-079X 391:1-2<139 2015 391 11104