Cell wall polysaccharides are involved in P-deficiency-induced Cd exclusion in Arabidopsis thaliana

Xiao Fang Zhu, Gui Jie Lei, Tao Jiang, Yu Liu, Gui Xin Li, Shao Jian Zheng

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

The physiological and molecular mechanisms leading to the competitive interactions between phosphorus (P) and metal elements are a matter of debate. In this study, we found that P deficiency can alleviate cadmium (Cd) toxicity in Arabidopsis thaliana (Col-0). Under P deficiency (-P), less Cd was accumulated in the plants and the root cell walls, indicating the operation of a P-deficiency-induced Cd exclusion mechanism. However, organic acid efflux was similar under -P+Cd and +Cd treatments, suggesting that organic acid efflux is not responsible for the Cd exclusion. Interestingly, P deficiency significantly decreased cell wall polysaccharides (pectin and hemicellulose) contents and pectin methylesterase activity, and decreased the Cd retained by the extracted root cell wall. Therefore, we conclude that the modification of cell wall composition is responsible for the Cd exclusion of the root under P deficiency.

Original languageEnglish
Pages (from-to)989-997
Number of pages9
JournalPlanta
Volume236
Issue number4
DOIs
Publication statusPublished - Apr 24 2012
Externally publishedYes

Keywords

  • Cd
  • Hemicellulose
  • Pectin
  • Pectin methylesterase

ASJC Scopus subject areas

  • Genetics
  • Plant Science

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