Nicotianamine facilitates zinc translocation from roots to shoots in the nickel hyperaccumulator Odontarrhena chalcidica

文献类型： 外文期刊

第一作者： Deng, Teng-Hao-Bo

作者： Deng, Teng-Hao-Bo;Li, Lei;Wen, Dian;Huang, Yong-Dong;Sun, Sheng-Sheng;Wang, Xu;Du, Rui-Ying;Wang, Ya-Zhou;Tang, Ye-Tao;Mo, Bing-Lan;Liu, Ting;Qiu, Rong-Liang;Morel, Jean-Louis

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关键词： Nicotianamine; Zinc; Hyperaccumulation; Nickel

期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）

ISSN： 0032-079X

年卷期： 2025 年

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收录情况： SCI

摘要： Background and aimsNickel (Ni) hyperaccumulator Odontarrhena chalcidica can absorb high levels of zinc (Zn) in its roots but fails to hyperaccumulate Zn in its shoots. The reasons behind the absence of this Zn hyperaccumulation trait in O. chalcidica, in contrast to known Zn hyperaccumulators, remain elusive. Nicotianamine (NA) is an organic ligand which can increase the mobility of metals in vivo by forming stable metals-NA complex. Thus, this study evaluated the influence of NA on root-shoot transport of Zn in O. chalcidica by comparison with the Zn hyperaccumulator Noccaea caerulescens.MethodsBoth species were cultivated under + Ni and + Zn treatments in hydroponic solutions. NA concentrations, the expression levels of NA synthesis related genes and Zn distribution in subcellular fractions of roots were evaluated. Additionally, the effect of exogenous NA supply on Zn transport was explored.ResultsNA concentrations in the roots of O. chalcidica declined from 2.30 to 0.600 mg kg-1 under Zn exposure, whereas that of N. caerulescens significantly increased by 40.5% (to 3.09 mg kg-1). Zn treatment suppressed the expression of OcNAS3 and OcSAMS2, which involved in NA biosynthesis, by 97.0% and 89.7%, respectively. Nevertheless, pretreatment with NA enhance soluble Zn fraction in roots, and increased root-shoot transport of Zn in O. chalcidica, raising the shoot-to-root Zn concentration ratio from 0.548 to 0.919.ConclusionsThe inhibition of NA synthesis by Zn is an important reason for the impaired root-shoot transfer for Zn in O. chalcidica. And NA plays a key role on the Zn mobility within plants.

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