Interaction of nitrogen and phosphorus nutrition in determining growth |
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Authors: | de Groot Corine C Marcelis Leo F M van den Boogaard Riki Kaiser Werner M Lambers Hans |
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Institution: | (1) Plant Research International, PO Box 16, 6700 AA Wageningen, The Netherlands;(2) Agrotechnological Research Institute (ATO), Wageningen, The Netherlands;(3) Plant Ecophysiology, Utrecht University, Utrecht, The Netherlands;(4) Julius-von-Sachs-Institut of Biosciences, University of Wuerzburg, Wuerzburg, Germany;(5) School of Plant Biology, The University of Western Australia, Crawley, WA, 6009, Australia;(6) Plant Ecophysiology, Utrecht University, Utrecht, The Netherlands |
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Abstract: | In this paper we discuss the differences and similarities in the growth response of tomato plants to N and P limitation, and to their interaction. Two detailed growth experiments, with varied N or P supply, were conducted in order to unravel the effects of N and P limitation on growth of young tomato plants (Lycopersicon esculentum Mill.). Relative growth rate (RGR) initially increased sharply with increasing plant P concentration but leveled off at higher plant P concentrations. In contrast, RGR increased gradually with increasing plant N concentration before it leveled off at higher plant N concentrations. The relationship of RGR with organic leaf N and P showed the same shape as with total N and P concentrations, respectively. The difference in response is most likely due to the different roles of N and P in the machinery of the plant's energy metabolism (e.g., photosynthesis, respiration). Plant N concentration decreased with increasing P limitation. We show that this decrease cannot be explained by a shift in dry-mass partitioning. Our results suggest that the decrease in N concentration with increasing P limitation may be mediated by a decrease in leaf cytokinin levels and is less likely due to decreased energy availability at low P conditions. Dry-mass partitioning to the roots was closely linearly related to the leaf reduced-N concentration. However, treatments that were severely P limited deviated from this relationship. |
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Keywords: | cytokinins dry-mass partitioning Lycopersicon esculentum nitrogen– phosphorus interaction relative growth rate tomato |
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