Effect of light and nitrogen supply on internal C:N balance and control of root-to-shoot biomass allocation in grapevine |
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| Institution: | 1. Universidad de Navarra, Grupo de Fisiología del Estrés en Plantas (Dpto. Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Irunlarrea, 1, 31008, Pamplona, Spain;2. Estación Experimental de Aula Dei (EEAD), CSIC, Dpto. Nutrición Vegetal, Apdo. 13034, 50080 Zaragoza, Spain;3. INRA, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave d’Ornon, France;4. University of Bordeaux, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave d’Ornon, France;1. The University of Adelaide, School of Agriculture, Food and Wine, Waite Research Institute, PMB 1 Glen Osmond, 5064 South Australia, Australia;3. CSIRO Agriculture, Waite Campus Laboratory, Private Bag 2, Glen Osmond, SA 5064, Australia;4. Institute of Future Farming, School of Health, Medical and Applied Sciences, Central Queensland University, Rockhampton, Queensland, Australia;1. Institut Français de la Vigne et du Vin Pôle Rhône-Méditerranée, Domaine de Donadille, 30230 Rodilhan, France;2. Montpellier SupAgro, UMR System, 2 place Pierre Viala, 34060 Montpellier Cedex 2, France;3. INRA, UMR System, 2 place Pierre Viala, 34060 Montpellier Cedex 2, France;1. School of Science and Technology, University of New England, Armidale, NSW, 2351, Australia;2. GEA – Environmental Soil Science Group, Department of Agrochemistry and Environment, University Miguel Hernández, Avda de la Universidad s/n., 03202, Elche, Alicante, Spain;1. Department of General and Organic Viticulture, Hochschule Geisenheim University, Von-Lade-Strasse 1, D-65366 Geisenheim, Germany;2. Institute of Agronomy and Plant Breeding I, Justus Liebig University, Schubertstrasse 81, D-35392 Giessen, Germany |
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| Abstract: | Theoretical plant growth models postulate that the relative rates of shoot and root growth are largely modulated by signals related to carbon and nitrogen status of the plant. To test this experimentally, 6-week-old vegetative cuttings of grapevine (Vitis vinifera L. cv Merlot) were grown aeroponically in different controlled conditions of irradiance (13.8, 8.4 and 5.3 mol PAR m?2 day?1) and/or nitrogen nutrition (0.15, 1.20 and 7.11 mM N). Total non-structural carbohydrates (TNC) and amino acids (FAA) in leaves and roots were analysed 0, 6 and 28 days after treatment initiation. Both whole-plant biomass accumulation as well as C and N contents were highly responsive to light and N availability. At day 28, plant dry weight was significantly reduced in shaded vines (?35% of that of the control plants) and stimulated under the high irradiance environment (+30%). Deprivation of N enhanced root growth (+51%) at the expense of above-ground growth, whereas leaf dry weight was significantly greater in the high-N treatment than in the control. Vines grown under low-N and high irradiance conditions had the highest root-to-shoot ratios and those grown under low light and high N the lowest. Finally, redistribution of biomass among vegetative vine parts was significantly related to different indicators of the vine C:N status measured either at the whole-plant (N concentration) or at the organ level (TNC:FAA ratio), suggesting that root-to-shoot biomass partitioning was controlled by some aspect of plant C:N balance. Such relationships will be useful to improve allocation rules in a process-based growth model of grapevine. |
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