Transcriptional regulation of ZIP genes is independent of local zinc status in Brachypodium shoots upon zinc deficiency and resupply

• DOI: 10.1111/pce.14151
• Publication Date: 2021-07-15T12:16:28Z
• Authors: Sahand Amini; Borjana Arsova; Sylvie Gobert; Monique Carnol; Bernard Bosman; Patrick Motte; Michelle Watt; Marc Hanikenne
• Keywords: Brachypodium distachyon; Brachypodium

Abstract The biological processes underlying zinc homeostasis are targets for genetic improvement of crops to counter human malnutrition. Detailed phenotyping, ionomic, RNA‐Seq analyses and flux measurements with 67 Zn isotope revealed whole‐plant molecular events upon varying supply during resupply starved Brachypodium distachyon (Brachypodium) plants. Although both deficiency excess hindered growth, accumulation biomass micronutrients into roots shoots differed depending on supply. dynamics involved 1,893 zinc‐responsive genes. Multiple zinc‐regulated transporter iron‐regulated (IRT)‐like protein (ZIP) genes dozens other were rapidly transiently down‐regulated in early stages resupply, suggesting a transient shock, sensed locally roots. Notably, identical regulation observed without accumulation, pointing root‐to‐shoot signals mediating responses resupply. Molecular uncovered the grass model useful staple monocots.