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    Rhizosphere acidification of faba bean, soybean and maize

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    Abstract
    Interspecific facilitation on phosphorus uptake was observed in faba bean/maize intercropping systems in previous studies. The mechanism behind this, however, remained unknown. Under nitrate supply, the difference in rhizosphere acidification potential was studied by directly measuring pH of the solution and by visualizing and quantifying proton efflux of roots between faba bean (Vicia faba L. cv. Lincan No.5), soybean (Glycine max L. cv. Zhonghuang No. 17) and maize (Zea mays L. cv. Zhongdan No.2) in monoculture and intercrop, supplied without or with 0.2 mmol L? 1 P as KH2PO4. The pH of the nutrient solution grown faba bean was lower than initial pH of 6.0 from day 1 to day 22 under P deficiency, whereas the pH of the solution with maize was declined from day 13 after treatment. Growing soybean increased solution pH irrespective of P supply. Under P deficiency, the proton efflux of faba bean both total (315.25 nmol h? 1 plant? 1) and specific proton efflux (0.47 nmol h? 1 cm? 1) was greater than that those of soybean (21.80 nmol h? 1 plant? 1 and 0.05 nmol h? 1 cm? 1, respectively). Faba bean had much more ability of rhizosphere acidification than soybean and maize. The result can explain partly why faba bean utilizes sparingly soluble P more effectively than soybean and maize do, and has an important implication in understanding the mechanism behind interspecific facilitation on P uptake by intercropped species.
    Article Outline
    1. Introduction
    2. Materials and methods
    2.1. Plant materials and culture conditions
    2.1.1. Experiment 1
    2.1.2. Experiment 2
    2.2. pH of nutrient solution (Experiment 1)
    2.3. Visualization of rhizosphere acidification (Experiment 2)
    2.4. Quantification of roots proton efflux (Experiment 2)
    2.4.1. Root length
    2.5. Harvesting and biomass measurement
    2.5.1. Experiment 1
    2.5.2. Experiment 2
    2.6. Statistical analysis
    3. Results
    3.1. Plant growth and biomass
    3.2. pH in nutrient solution grown different species (Experiment 1)
    3.3. Visualization of rhizosphere acidification (Experiment 2)
    3.4. Proton efflux of whole plant roots (Experiment 2)
    3.5. Specific proton efflux (Experiment 2)
    4. Discussions
    Acknowledgements
    References
     

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    作者:Zhou, L.L.,Cao, J.,Zhang, F.S.,Li, L. 来源:Elsevier 发布时间:2011年07月12日