Modulation of polar auxin transport identifies the molecular determinants of source–sink carbon relationships and sink strength in poplar

Balasubramanian, Vimal K.; Rivas-Ubach, Albert; Winkler, Tanya; Mitchell, Hugh; Moran, James; Ahkami, Amir H.; Adams, ed., Henry

doi:10.1093/treephys/tpad073

Title: Modulation of polar auxin transport identifies the molecular determinants of source–sink carbon relationships and sink strength in poplar

Journal Article · 19 May 2023 · Tree Physiology (Online)

DOI: https://doi.org/10.1093/treephys/tpad073 · OSTI ID:2530669

Balasubramanian, Vimal K.; Rivas-Ubach, Albert; Winkler, Tanya; Mitchell, Hugh; Moran, James;

; Adams, ed., Henry

Abstract Source-to-sink carbon (C) allocation driven by the sink strength, i.e., the ability of a sink organ to import C, plays a central role in tissue growth and biomass productivity. However, molecular drivers of sink strength have not been thoroughly characterized in trees. Auxin, as a major plant phytohormone, regulates the mobilization of photoassimilates in source tissues and elevates the translocation of carbohydrates toward sink organs, including roots. In this study, we used an ‘auxin-stimulated carbon sink’ approach to understand the molecular processes involved in the long-distance source–sink C allocation in poplar. Poplar cuttings were foliar sprayed with polar auxin transport modulators, including auxin enhancers (AE) (i.e., IBA and IAA) and auxin inhibitor (AI) (i.e., NPA), followed by a comprehensive analysis of leaf, stem and root tissues using biomass evaluation, phenotyping, C isotope labeling, metabolomics and transcriptomics approaches. Auxin modulators altered root dry weight and branching pattern, and AE increased photosynthetically fixed C allocation from leaf to root tissues. The transcriptome analysis identified highly expressed genes in root tissue under AE condition including transcripts encoding polygalacturonase and β-amylase that could increase the sink size and activity. Metabolic analyses showed a shift in overall metabolism including an altered relative abundance levels of galactinol, and an opposite trend in citrate levels in root tissue under AE and AI conditions. In conclusion, we postulate a model suggesting that the source–sink C relationships in poplar could be fueled by mobile sugar alcohols, starch metabolism-derived sugars and TCA-cycle intermediates as key molecular drivers of sink strength.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2530669

Report Number(s):: PNNL-SA-179481

Journal Information:: Tree Physiology (Online), Journal Name: Tree Physiology (Online) Journal Issue: 13 Vol. 44; ISSN 1758-4469

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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metabolomics
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root
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Title: Modulation of polar auxin transport identifies the molecular determinants of source–sink carbon relationships and sink strength in poplar

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