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Jasmonic acid alleviates cadmium toxicity in Arabidopsis via suppression of cadmium uptake and translocation 被引量:15

Jasmonic acid alleviates cadmium toxicity in Arabidopsis via suppression of cadmium uptake and translocation
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摘要 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,At AOS,greatly enhances the expression of AtIRT1,AtHMA2 and AtHMA4,increases Cd concentration in both roots and shoots,and confers increased sensitivity to Cd.Exogenous Me JA recovers the enhanced Cd-sensitivity of the ataos mutant,but not of atcoi1,a JA receptor mutant.In addition,exogenous Me JA 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. 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, At AOS, greatly enhances the expression of AtIRT1, AtHMA2 and AtHMA4,increases Cd concentration in both roots and shoots, and confers increased sensitivity to Cd. Exogenous Me JA recovers the enhanced Cd-sensitivity of the ataos mutant,but not of atcoi1, a JA receptor mutant. In addition,exogenous Me JA 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.
出处 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2020年第2期218-227,共10页 植物学报(英文版)
基金 supported by National Key R&D Program of China(2016YFD0100704) 111 project(B14027) fundamental research fund for central Universities.
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