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ELONGATED HYPOCOTYL 5 (HY5) and POPEYE (PYE) Regulate Intercellular Iron Transport in Plants .
  • +1
  • Samriti Mankotia,
  • Abhishek Dubey,
  • Pooja Jakhar,
  • Santosh Satbhai
Samriti Mankotia
Indian Institute of Science Education and Research Mohali
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Abhishek Dubey
Indian Institute of Science Education and Research Mohali
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Pooja Jakhar
Indian Institute of Science Education and Research Mohali
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Santosh Satbhai
Indian Institute of Science Education and Research Mohali

Corresponding Author:[email protected]

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Abstract

Plants maintain iron (Fe) homeostasis under varying environmental conditions by balancing processes such as Fe uptake, transport, and storage. In Arabidopsis, POPEYE (PYE), a basic helix-loop-helix (bHLH) transcription factor (TF), has been shown to play a crucial role in regulating this balance. In recent years, the mechanisms regulating Fe uptake have been well established but the upstream transcriptional regulators of Fe transport and storage are still poorly understood. In this study, we report that ELONGATED HYPOCOTYL5 (HY5), a basic leucine zipper (bZIP) TF which has recently been shown to play a crucial role in Fe homeostasis, interacts with PYE. Molecular, genetic and biochemical approaches revealed that PYE and HY5 have overlapping as well as some distinct roles in regulation of Fe deficiency response. We found that HY5 and PYE both act as a repressor of Fe transport genes such as YSL3, FRD3 NPF5.9, YSL2, NAS4, and OPT3. HY5 was found to directly bind on the promoter of these genes and regulate intercellular Fe transport. Further analysis revealed that HY5 and PYE directly interact at the same region on PYE and NAS4 promoter. Overall, this study revealed that HY5 regulates Fe homeostasis by physically interacting with PYE as well as independently.
Submitted to Plant, Cell & Environment
23 Jul 20241st Revision Received
27 Jul 2024Submission Checks Completed
27 Jul 2024Assigned to Editor
29 Jul 2024Review(s) Completed, Editorial Evaluation Pending
29 Jul 2024Reviewer(s) Assigned
01 Aug 2024Editorial Decision: Accept