Effect of in planta phosphorus on aluminum-induced inhibition of root elongation in wheat

Ji Feng Shao, Jing Che, Rong Fu Chen, Jian Feng Ma, Ren Fang Shen

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    Aims: Both aluminum (Al) toxicity and phosphorus (P) deficiency are limiting factors of crop production on acid soils. Although Al-P interaction has been extensively studied, the results are controversial. The aim of this study is to investigate the effect of in planta P on Al-induced inhibition of root elongation in wheat (Triticum aestivum L.). Methods: Roots of wheat (cv. Atlas 66) with different internal P concentrations were prepared by two methods; split-root and re-rooting in a hydroponic solution using three different P levels (0, 25 and 250 μM) to avoid direct precipitation of Al-P in the solution. Al toxicity was evaluated by root elongation inhibition and callose induction. The Al and P concentrations in the root tips were also compared among different treatments. Results: Both split-root and re-rooting methods generated roots with different P concentrations in the tips when exposed to different P levels. Lower P in the root tips resulted in less Al-induced inhibition of the root elongation, less callose content and less Al accumulation, while higher root P caused a higher Al-induced inhibition of the root elongation, increased callose content and Al accumulation in the root tips. Furthermore, Al in the root cell sap was not altered by different P concentrations, but Al in the root cell wall was increased with increasing in planta P concentrations. Conclusions: Al toxicity in wheat is associated with P in the root cell wall; lower root P enhanced Al tolerance, while higher root P aggravated Al toxicity in wheat.

    Original languageEnglish
    Pages (from-to)307-315
    Number of pages9
    JournalPlant and Soil
    Volume395
    Issue number1-2
    DOIs
    Publication statusPublished - Oct 26 2015

    Keywords

    • Aluminum
    • Cell wall
    • In planta
    • Phosphorus
    • Re-rooting
    • Split-root
    • Wheat root

    ASJC Scopus subject areas

    • Soil Science
    • Plant Science

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