caa a22 4500 606217592 CHVBK 20210128101108.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s11104-015-2454-0 doi (NATIONALLICENCE)springer-10.1007/s11104-015-2454-0 Changes in root morphology and physiology to limited phosphorus and moisture in a locally-selected cultivar and an introduced cultivar of Medicago sativa L. growing in alkaline soil [Elektronische Daten] [Jing-Wei Fan, Yan-Lei Du, Neil Turner, Bing-Ru Wang, Yan Fang, Yue Xi, Xiao-Ran Guo, Feng-Min Li] Background and aims: The productivity of lucerne (Medicago sativa L.) is limited by phosphorus (P) deficiency and drought on alkaline soils in northwest China. The aim of this study was to identify the morphological and physiological responses of roots to P- and moisture-limited conditions in an alkaline soil. Methods: A pot experiment compared the growth and root characteristics of an introduced (Arkaxiya) and a locally-selected (Longzhong) lucerne cultivar grown in alkaline soil, with an initial available soil P of 6.9μg P g−1 dry soil and a pH of 8.3, with four applied-P rates (0, 4.2, 8.4 and 16.8μg P g−1 dry soil) and three soil moisture treatments [maintained at 75-90%, 45-55% and 30-35% of field capacity (FC)]. Results: At high soil P and high soil water content (SWC), high total root length contributed to high P uptake, high P-use efficiency, and greater plant growth in Arkaxiya compared to Longzhong. However at low SWC, Longzhong had a higher specific root length (thinner roots) and higher total root length than Arkaxiya. At low SWC greater biomass was allocated to roots, at low P-supply the specific root length increased, while the combination of low soil P and low SWC induced greater release of rhizosphere carboxylates. Conclusions: The results suggest that the introduced cultivar has traits that will benefit lucerne production in all but the driest and low-phosphate alkaline soils. Springer International Publishing Switzerland, 2015 Alfalfa nationallicence Carboxylates nationallicence Drought nationallicence Lucerne nationallicence Specific root length nationallicence Total root length nationallicence AM : Arbuscilar mycorrhizae nationallicence DAS : Days after sowing nationallicence DW : Dry weight nationallicence FC : Field capacity nationallicence MS : Moderate drought stress nationallicence RMR : Root mass ratio nationallicence SRL : Specific root length nationallicence SS : Severe drought stress nationallicence SWC : Soil water content nationallicence WW : Well-watered nationallicence Fan Jing-Wei State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut Du Yan-Lei State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut Turner Neil State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut Wang Bing-Ru State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut Fang Yan State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut Xi Yue State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut Guo Xiao-Ran Cuiying Honors College, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut Li Feng-Min State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut Plant and Soil Springer International Publishing 392/1-2(2015-07-01), 215-226 0032-079X 392:1-2<215 2015 392 11104 https://doi.org/10.1007/s11104-015-2454-0 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/s11104-015-2454-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fan Jing-Wei State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut NATIONALLICENCE 700 1- Du Yan-Lei State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut NATIONALLICENCE 700 1- Turner Neil State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut NATIONALLICENCE 700 1- Wang Bing-Ru State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut NATIONALLICENCE 700 1- Fang Yan State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut NATIONALLICENCE 700 1- Xi Yue State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut NATIONALLICENCE 700 1- Guo Xiao-Ran Cuiying Honors College, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut NATIONALLICENCE 700 1- Li Feng-Min State Key Laboratory of Grassland Agro-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000, Lanzhou, Gansu Province, China aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 392/1-2(2015-07-01), 215-226 0032-079X 392:1-2<215 2015 392 11104