Photoprotection during iron deficiency is mediated by the bHLH transcription factors PYE and ILR3

Akmakjian, Garo Z.; Riaz, Nabila; Guerinot, Mary Lou

doi:10.1073/pnas.2024918118

Title: Photoprotection during iron deficiency is mediated by the bHLH transcription factors PYE and ILR3

Journal Article · 27 September 2021 · Proceedings of the National Academy of Sciences of the United States of America

DOI: https://doi.org/10.1073/pnas.2024918118 · OSTI ID:1982394

^[1]; Riaz, Nabila ^[1];

^[1]

Dartmouth College, Hanover, NH (United States)

Iron deficiency has many adverse effects on photosynthesis, which is not surprising given that 90% of foliar iron is found in the chloroplast. Although many iron-sparing mechanisms have been documented, a mechanistic understanding of how chloroplasts adapt to iron deficiency was lacking. Here, we show that the bHLH transcription factors ILR3 and PYE are required for photoprotection during iron deficiency. Changes in chloroplast morphology under the control of these transcription factors prevents the production of harmful reactive oxygen species and allows for repair of photosystem II. Understanding how plants adapt the photosynthetic machinery during iron deficiency may allow us to optimize plant growth in soils where iron is not bioavailable.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); US Department of Education

Grant/Contract Number:: SC0012704

OSTI ID:: 1982394

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 40 Vol. 118; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
Arabidopsis
chloroplasts
grana ROS
iron deficiency

Title: Photoprotection during iron deficiency is mediated by the bHLH transcription factors PYE and ILR3

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