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 journalArticle

4 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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