Histidine-mediated xylem loading of zinc is a species-wide character in Noccaea caerulescens
Related Experiment Video
Updated: May 1, 2026

Author Spotlight: Exploring Cellular Zinc Regulation Through ZnT1 Functionality
Published on: June 2, 2023
Anna D Kozhevnikova1, Ilya V Seregin1, Nadezhda T Erlikh1
1Laboratory of Root Physiology, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya str. 35, 127276, Moscow, Russia.
Abstract:
Histidine plays a crucial role in nickel (Ni) translocation in Ni-hyperaccumulating plants. Here, we investigated its role in zinc (Zn) translocation in four accessions of the Zn hyperaccumulator, Noccaea caerulescens, using the related non-hyperaccumulator, Thlaspi arvense, as a reference. We compared the effects of exogenous histidine supply on Zn xylem loading, and of Zn-histidine complex formation on Zn uptake in energized tonoplast vesicles. The Zn distribution patterns over root tissues were also compared. Exogenous histidine supply enhanced Zn xylem loading in all the N. caerulescens accessions, but decreased it in T. arvense. Zn distribution patterns over root tissues were similar, apart from the accumulation in cortical and endodermal cells, which was much lower in N. caerulescens than in T. arvense. Zn uptake in energized tonoplast vesicles was inhibited significantly in N. caerulescens, but not affected significantly in T. arvense, when Zn was supplied in combination with histidine in a 1:2 molar ratio. Histidine-mediated Zn xylem loading seems to be a species-wide character in N. caerulescens. It may well have evolved as a component trait of the hyperaccumulation machinery for Zn, rather than for Ni.
More Related Videos
09:13Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements
Published on: July 13, 2016
04:54Assessing Mineral Availability in Fish Feeds using Complementary Methods Demonstrated with the Example of Zinc in Atlantic Salmon
Published on: October 29, 2021
Related Concept Videos
Xylem and Transpiration-driven Transport of Resources
Short-distance Transport of Resources
Responses to Salt Stress
Water and Mineral Acquisition
Adaptations that Reduce Water Loss
Tonicity in Plants
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...