Response and Tolerance of to Excess Zinc Based on Transcriptome and Proteome Patterns.

is a dominant plant of mine tailings and a zinc (Zn) accumulator with high Zn tolerance. In this study, seedlings cultured in Hoagland solution were treated with 200 μmol·L of Zn for 1 day or 7 days, and then, their leaves were taken for a comparative analysis of the transcriptomes and proteomes between the leaves of the control and Zn treatments. Differentially expressed genes included those that were iron (Fe)-deficiency-induced, such as vacuolar iron transporter , ABC transporter and ferric reduction oxidase Those genes were significantly upregulated by Zn and could be responsible for Zn transport in the leaves of . Differentially expressed proteins, such as chlorophyll a/b-binding proteins, ATP-dependent protease, and vacuolar-type ATPase located on the tonoplast, were significantly upregulated by Zn and, thus, could be important in chlorophyll biosynthesis and cytoplasm pH stabilization. Moreover, the changes in Zn accumulation, the production of hydrogen peroxide, and the numbers of mesophyll cells in the leaves of were consistent with the expression of the genes and proteins. Thus, the proteins involved in the homeostasis of Zn and Fe are hypothesized to be the keys to the tolerance and accumulation of Zn in . Such mechanisms in can suggest novel approaches to genetically engineering and biofortifying crops.