Screening chickpea for adaptation to water stress: Associations between yield and crop growth rate |
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| Institution: | 1. Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy;2. Agroscope, Research Division Agroecology and Environment, Plant-Soil-Interactions, Reckenholzstrasse 191, 8046 Zürich, Switzerland;3. Department of Agricultural and Forestry Sciences, Tuscia University, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy;4. NIAB, Huntingdon Road, Cambridge CB3 0LE, UK;5. The Organic Research Centre Elm Farm, Hamstead Marshall, Newbury, Berkshire RG20 0HR, UK;6. Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Box 7043, 750 07 Uppsala, Sweden;7. Organic Agricultural Sciences – Ecological Plant Protection Group, University of Kassel, Nordbahnhofstraße 1a, 37213 Witzenhausen, Germany;1. CSIRO Agriculture Flagship, Australia;2. Department of Agriculture, Fisheries and Forestry, Australia;3. The University of Queensland, Queensland Alliance for Agriculture and Food Innovation (QAAFI), Australia;4. AgResearch, New Zealand;5. The New Zealand Institute for Plant & Food Research, New Zealand;6. CSIRO, Australia;7. Crop Production Systems in the Tropics, Georg-August-Universität, Göttingen, Germany;8. Cropfacts Pty Ltd., Australia;9. Birchip Cropping Group, Australia;1. Facultad de Ciencias Agrarias, Universidad Nacional de Rosario, Campo Experimental Villarino S/N, Zavalla (S2125ZAA), Prov. de Santa Fe, Argentina;2. Dacsa Maicerías Españolas, Carretera de Barcelona Nro. 5, Almassera, Valencia, Spain;3. Kellogg Company, 2 Hamblin Avenue East, Battle Creek, MI 49016, United States;1. Department of Agronomy and Horticulture, University of Nebraska–Lincoln, Lincoln, NE 68583-0915, USA;2. Department of Statistics, University of Nebraska–Lincoln, Lincoln, NE 68583-0963, USA;1. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India;2. Crop Science Lab, Graduate School of Agriculture, Hokkaido University, Kita 9 Nishi 9, Kita-Ku, Sapporo 060-8589, Japan;3. Jawaharlal Nehru Technological University (JNTU), Hyderabad, India;1. School of Agriculture and Food Sciences, The University of Queensland, St. Lucia, QLD, Australia;2. CSIRO Land and Water, GPO Box 1666, Canberra, ACT 2601, Australia;3. Queensland Department of Agriculture and Fisheries, PO Box 2282, Toowoomba, Qld 4350, Australia;4. School of Agriculture and Food Sciences, The University of Queensland, Gatton, QLD, Australia;5. Queensland Alliance for Agriculture and Food Innovation, School of Crop and Food Sciences, University of Queensland, Gatton, Qld 4343, Australia |
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| Abstract: | Robust associations between yield and crop growth rate in a species-specific critical developmental window have been demonstrated in many crops. In this study we focus on genotype-driven variation in crop growth rate and its association with chickpea yield under drought. We measured crop growth rate using Normalised Difference Vegetative Index (NDVI) in 20 diverse chickpea lines, after calibration of NDVI against biomass accounting for morphological differences between Kabuli and Desi types. Crops were grown in eight environments resulting from the combination of seasons, sowing dates and water supply, returning a yield range from 152 to 366 g m?2. For both sources of variation – environment and genotype – yield correlated with crop growth rate in the window 300 °Cd before flowering to 200 °Cd after flowering. In the range of crop growth rate from 0.07 to 0.91 g m?2 °Cd?1, the relationship was linear with zero intercept, as with other indeterminate grain legumes. Genotype-driven associations between yield and crop growth rate were stronger under water stress than under favourable conditions. Despite this general trend, lines were identified with high crop growth rate in both favourable and stress conditions. We demonstrate that calibrated NDVI is a rapid, inexpensive screening tool to capture a physiologically meaningful link between yield and crop growth rate in chickpea. |
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| Keywords: | Crop growth rate Chickpea Yield Seed number Spectral reflectance Water stress |
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