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Updated: Jan 15, 2026

Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements
Published on: July 13, 2016
Zinc translocation from Zn-sufficient to Zn-deficient roots as an adaptation to heterogeneous Zn availability
Magdalena Pypka1, Diana Davydenko1, Katarzyna Sowa2
1Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, Department of Plant Metal Homeostasis, University of Warsaw, Miecznikowa Street 1, Warsaw, 02-096, Poland.
Abstract:
Zinc is essential for plant development and human health. While the effects of soil nutrient heterogeneity on plant growth were studied for macronutrients, adaptive mechanisms for micronutrients like Zn remain largely unexplored. We investigate Zn homeostasis in Nicotiana tabacum plants grown in a transparent soil medium mimicking natural soil conditions with spatially heterogeneous Zn availability. Our findings suggest a previously unrecognized mechanism in which Zn is translocated between lateral roots, moving from Zn-sufficient to Zn-deficient ones, mitigating Zn deficiency responses and reducing Zn uptake. Under heterogeneous Zn conditions, the expression of key Zn homeostasis-related genes (encoding Zn importer - NtZIP4B, Zn exporter - NtHMA4a/b and Zn chelator - NtNAS) was significantly altered. NtHMA4a/b expression was influenced by the vertical positioning of the Zn-sufficient medium, while NtZIP4B and NtNAS showed suppressed expression in roots under heterogeneous conditions compared to homogeneous Zn-sufficient conditions. This suggests a systemic regulatory mechanism coordinating Zn allocation depending on whole root system Zn access. Elemental analysis revealed reduced overall Zn concentrations in plants grown in heterogeneous Zn media, with elevated Zn levels in leaf veins. This study uncovers a novel mechanism of Zn translocation within the root system in response to heterogeneous Zn supply, highlighting the complexity of micronutrient homeostasis and its adaptive regulation.
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