Soil-applied phosphorous is an effective tool to mitigate the toxicity of copper excess on grapevine grown in rhizobox
2018
Baldi, Elena | Miotto, Alcione | Ceretta, Carlos Alberto | Quartieri, Maurizio | Sorrenti, Giovambattista | Brunetto, Gustavo | Toselli, Moreno
The aim of the present study was to evaluate the effectiveness of P soil addition to mitigate the toxic effect of excess of Cu on grapevine on sandy non-calcareous soil.Micro-propagated plants of 1103 Paulsen rootstock were grown according to a factorial experimental design with two factors: Cu addition (0, 100, 200 and 300mgkg−1dw) and P addition (0, 50 and 100mgkg−1 soil dw). The experiment was conducted in the greenhouse and plants were grown on a sandy soil in rhizoboxes. At the end of the trial, plants were destructively harvested, the biomass and the nutrient concentration of organs were determined. Root growth was evaluated during the trial and the concentration of organic acid in root tissue and exudates was determined.Shoot length and plant biomass declined as Cu concentration in soil increased; the application of P enhanced plant growth and nutritional status. Root biomass decreased at Cu>100mgkg−1 and increased in P at 100mgkg−1. Phosphorous stimulated root length, diameter and the number of apexes. Root citric acid increased as a response of Cu at 300mgkg−1, root ascorbic acid decreased with the increase of Cu (200 and 300mgkg−1) and P at 100mgkg−1. The concentration of citric acid from root exudations was higher in Cu at 300mgkg−1 and Cu at 200mgkg−1 (compared to control) and P at 100mgkg−1 soils.The application of P fertilization seems to be a valuable strategy to overcome the toxicity of high concentration of Cu in soil.
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