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- W4319661819 abstract "Abstract Lead (Pb) is one of the most toxic heavy metal pollutants, which can penetrate to plant cells via root absorption and thus cause irreversible damages to the human body through the food chain. To identify the hub gene responsible for Pb tolerance in maize, we performed a trait-associated co-expression network analysis at a genome-wide level, using two maize lines with contrasting Pb tolerances. Finally, ZmNRAMP6 that encodes a metal transporter was identified as the hub gene among the Pb tolerance-associated co-expression module. Heterologous expression of ZmNRAMP6 in yeast verified its role in Pb transport. Combined Arabidopsis overexpression and maize mutant analysis suggested that ZmNRAMP6 conferred plant sensitivity to Pb stress by transporting Pb ion from the roots to shoots. Knockout of ZmNRAMP6 caused Pb retention in the roots and activation of the antioxidant enzyme system, resulting in an increased Pb tolerance in maize. An integration of yeast one-hybrid and dual-luciferase reporter assay uncovered that ZmNRAMP6 was negatively regulated by a known Pb tolerance-related transcript factor ZmbZIP54. Different from the other known NRAMP genes, ZmNRAMP6 acted as a Pb transporter from the roots to shoots and environment. Collectively, knockout of ZmNRAMP6 will aid in the bioremediation of contaminated soil and food safety guarantee of forage and grain corn." @default.
- W4319661819 created "2023-02-10" @default.
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- W4319661819 date "2023-02-09" @default.
- W4319661819 modified "2023-10-18" @default.
- W4319661819 title "A genome-wide co-expression network analysis revealed ZmNRAMP6-mediated regulatory pathway involved in maize tolerance to lead stress" @default.
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- W4319661819 doi "https://doi.org/10.21203/rs.3.rs-2500013/v1" @default.
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