Aluminium alleviates manganese toxicity to rice by decreasing root symplastic Mn uptake and reducing availability to shoots of Mn stored in roots

Wei Wang, Xue Qiang Zhao, Zhen Min Hu, Ji Feng Shao, Jing Che, Rong Fu Chen, Xiao Ying Dong, Ren Fang Shen

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Background and Aims Manganese (Mn) and aluminium (Al) phytotoxicities occur mainly in acid soils. In some plant species, Al alleviates Mn toxicity, but the mechanisms underlying this effect are obscure. Methods Rice (Oryza sativa) seedlings (11∈d old) were grown in nutrient solution containing different concentrations of Mn2+ and Al3+ in short-term (24∈h) and long-term (3 weeks) treatments. Measurements were taken of root symplastic sap, root Mn plaques, cell membrane electrical surface potential and Mn activity, root morphology and plant growth. Key Results In the 3-week treatment, addition of Al resulted in increased root and shoot dry weight for plants under toxic levels of Mn. This was associated with decreased Mn concentration in the shoots and increased Mn concentration in the roots. In the 24-h treatment, addition of Al resulted in decreased Mn accumulation in the root symplasts and in the shoots. This was attributed to higher cell membrane surface electrical potential and lower Mn2+ activity at the cell membrane surface. The increased Mn accumulation in roots from the 3-week treatment was attributed to the formation of Mn plaques, which were probably related to the Al-induced increase in root aerenchyma. Conclusions The results show that Al alleviated Mn toxicity in rice, and this could be attributed to decreased shoot Mn accumulation resulting from an Al-induced decrease in root symplastic Mn uptake. The decrease in root symplastic Mn uptake resulted from an Al-induced change in cell membrane potential. In addition, Al increased Mn plaques in the roots and changed the binding properties of the cell wall, resulting in accumulation of non-available Mn in roots.

Original languageEnglish
Pages (from-to)237-246
Number of pages10
JournalAnnals of Botany
Volume116
Issue number2
DOIs
Publication statusPublished - Aug 1 2015

Keywords

  • Aluminium
  • Gouy-Chapman-Stern model
  • Oryza sativa
  • acid soils
  • manganese plaques
  • manganese toxicity
  • plasma membrane surface electrical potential
  • rice
  • root aerenchyma
  • root symplast

ASJC Scopus subject areas

  • Plant Science

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