Jasmonic acid alleviates cadmium toxicity in Arabidopsis via suppression of cadmium uptake and translocation

Guijie Lei, Li Sun, Ying Sun, Xiao Fang Zhu, Gui Xin Li, Shao Jian Zheng

Research output: Contribution to journalArticle

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Abstract

Jasmonic acid (JA) is thought to be involved in plant responses to cadmium (Cd) stress, but the underlying molecular mechanisms are poorly understood. Here, we show that Cd treatment rapidly induces the expression of genes promoting endogenous JA synthesis, and subsequently increases the JA concentration in Arabidopsis roots. Furthermore, exogenous methyl jasmonate (MeJA) alleviates Cd-generated chlorosis of new leaves by decreasing the Cd concentration in root cell sap and shoot, and decreasing the expression of the AtIRT1, AtHMA2 and AtHMA4 genes promoting Cd uptake and long-distance translocation, respectively. In contrast, mutation of a key JA synthesis gene, AtAOS, greatly enhances the expression of AtIRT1, AtHMA2 and AtHMA4, increases Cd concentration in both roots and shoots, and confers increased sensitivity to Cd. Exogenous MeJA recovers the enhanced Cd-sensitivity of the ataos mutant, but not of atcoi1, a JA receptor mutant. In addition, exogenous MeJA reduces NO levels in Cd-stressed Arabidopsis root tips. Taken together, our results suggest that Cd-induced JA acts via the JA signaling pathway and its effects on NO levels to positively restrict Cd accumulation and alleviates Cd toxicity in Arabidopsis via suppression of the expression of genes promoting Cd uptake and long-distance translocation.

Original languageEnglish
JournalJournal of Integrative Plant Biology
DOIs
Publication statusPublished - Jan 1 2019
Externally publishedYes

Fingerprint

jasmonic acid
Cadmium
Arabidopsis
Toxicity
cadmium
toxicity
uptake mechanisms
methyl jasmonate
Genes
Hypochromic Anemia
Gene Expression
gene expression
mutants
synthesis
shoots
Meristem
chlorosis
root tips
sap
plant response

ASJC Scopus subject areas

  • Biochemistry
  • Biochemistry, Genetics and Molecular Biology(all)
  • Plant Science

Cite this

Jasmonic acid alleviates cadmium toxicity in Arabidopsis via suppression of cadmium uptake and translocation. / Lei, Guijie; Sun, Li; Sun, Ying; Zhu, Xiao Fang; Li, Gui Xin; Zheng, Shao Jian.

In: Journal of Integrative Plant Biology, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Zheng, Shao Jian

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