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Khan MA, Castro-Guerrero NA, McInturf SA, Nguyen NT, Dame AN, Wang J, Bindbeutel RK, Joshi T, Jurisson SS, Nusinow DA, Mendoza-Cozatl DG. Changes in iron availability in Arabidopsis are rapidly sensed in the leaf vasculature and impaired sensing leads to opposite transcriptional programs in leaves and roots. Plant Cell Environ 2018; 41:2263-2276. [PMID: 29520929 DOI: 10.1111/pce.13192] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 03/04/2018] [Accepted: 03/05/2018] [Indexed: 05/18/2023]
Abstract
The OLIGOPEPTIDE TRANSPORTER 3 (OPT3) has recently been identified as a component of the systemic network mediating iron (Fe) deficiency responses in Arabidopsis. Reduced expression of OPT3 induces an over accumulation of Fe in roots and leaves, due in part by an elevated expression of the IRON-REGULATED TRANSPORTER 1. Here we show however, that opt3 leaves display a transcriptional program consistent with an Fe overload, suggesting that Fe excess is properly sensed in opt3 leaves and that the OPT3-mediated shoot-to-root signaling is critical to prevent a systemic Fe overload. We also took advantage of the tissue-specific localization of OPT3, together with other Fe-responsive genes, to determine the timing and location of early transcriptional events during Fe limitation and resupply. Our results show that the leaf vasculature responds more rapidly than roots to both Fe deprivation and resupply, suggesting that the leaf vasculature is within the first tissues that sense and respond to changes in Fe availability. Our data highlight the importance of the leaf vasculature in Fe homeostasis by sensing changes in apoplastic levels of Fe coming through the xylem and relaying this information back to roots via the phloem to regulate Fe uptake at the root level.
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Affiliation(s)
- Mather A Khan
- Division of Plant Sciences, C.S. Bond Life Sciences Center, University of Missouri, Columbia, MO, 65211, USA
| | - Norma A Castro-Guerrero
- Division of Plant Sciences, C.S. Bond Life Sciences Center, University of Missouri, Columbia, MO, 65211, USA
| | - Samuel A McInturf
- Division of Plant Sciences, C.S. Bond Life Sciences Center, University of Missouri, Columbia, MO, 65211, USA
| | - Nga T Nguyen
- Division of Plant Sciences, C.S. Bond Life Sciences Center, University of Missouri, Columbia, MO, 65211, USA
| | - Ashley N Dame
- Department of Chemistry, University of Missouri, Columbia, MO, 65211, USA
| | - Jiaojiao Wang
- Department of Computer Science; C. S. Bond Life Sciences Center, University of Missouri, Columbia, MO, 65211, USA
| | | | - Trupti Joshi
- Department of Computer Science; C. S. Bond Life Sciences Center, University of Missouri, Columbia, MO, 65211, USA
- Department of Molecular Microbiology and Immunology and Office of Research, School of Medicine; Informatics Institute, University of Missouri, Columbia, MO, 65211, USA
| | - Silvia S Jurisson
- Department of Chemistry, University of Missouri, Columbia, MO, 65211, USA
| | | | - David G Mendoza-Cozatl
- Division of Plant Sciences, C.S. Bond Life Sciences Center, University of Missouri, Columbia, MO, 65211, USA
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Huang H, Gehan MA, Huss SE, Alvarez S, Lizarraga C, Gruebbling EL, Gierer J, Naldrett MJ, Bindbeutel RK, Evans BS, Mockler TC, Nusinow DA. Cross-species complementation reveals conserved functions for EARLY FLOWERING 3 between monocots and dicots. Plant Direct 2017; 1:e00018. [PMID: 31245666 PMCID: PMC6508535 DOI: 10.1002/pld3.18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 08/10/2017] [Accepted: 09/13/2017] [Indexed: 05/03/2023]
Abstract
Plant responses to the environment are shaped by external stimuli and internal signaling pathways. In both the model plant Arabidopsis thaliana (Arabidopsis) and crop species, circadian clock factors are critical for growth, flowering, and circadian rhythms. Outside of Arabidopsis, however, little is known about the molecular function of clock gene products. Therefore, we sought to compare the function of Brachypodium distachyon (Brachypodium) and Setaria viridis (Setaria) orthologs of EARLY FLOWERING 3, a key clock gene in Arabidopsis. To identify both cycling genes and putative ELF3 functional orthologs in Setaria, a circadian RNA-seq dataset and online query tool (Diel Explorer) were generated to explore expression profiles of Setaria genes under circadian conditions. The function of ELF3 orthologs from Arabidopsis, Brachypodium, and Setaria was tested for complementation of an elf3 mutation in Arabidopsis. We find that both monocot orthologs were capable of rescuing hypocotyl elongation, flowering time, and arrhythmic clock phenotypes. Using affinity purification and mass spectrometry, our data indicate that BdELF3 and SvELF3 could be integrated into similar complexes in vivo as AtELF3. Thus, we find that, despite 180 million years of separation, BdELF3 and SvELF3 can functionally complement loss of ELF3 at the molecular and physiological level.
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Affiliation(s)
- He Huang
- Donald Danforth Plant Science CenterSt. LouisMOUSA
| | | | | | - Sophie Alvarez
- Donald Danforth Plant Science CenterSt. LouisMOUSA
- Present address:
University of Nebraska‐LincolnLincolnNEUSA
| | | | | | - John Gierer
- Donald Danforth Plant Science CenterSt. LouisMOUSA
| | - Michael J. Naldrett
- Donald Danforth Plant Science CenterSt. LouisMOUSA
- Present address:
University of Nebraska‐LincolnLincolnNEUSA
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