2,4-D and IAA Amino Acid Conjugates Show Distinct Metabolism in Arabidopsis

Sammanfattning

The herbicide 2,4-D exhibits an auxinic activity and therefore can be used as a synthetic and traceable analog to study auxin-related responses. Here we identified that not only exogenous 2,4-D but also its amide-linked metabolite 2,4-D-Glu displayed an inhibitory effect on plant growth via the TIR1/AFB auxin-mediated signaling pathway. To further investigate 2,4-D metabolite conversion, identity and activity, we have developed a novel purification procedure based on the combination of ion exchange and immuno-specific sorbents combined with a sensitive liquid chromatography-mass spectrometry method. In 2,4-D treated samples, 2,4-D-Glu and 2,4-D-Asp were detected at 100-fold lower concentrations compared to 2,4-D levels, showing that 2,4-D can be metabolized in the plant. Moreover, 2,4-D-Asp and 2,4-D-Glu were identified as reversible forms of 2,4-D homeostasis that can be converted to free 2,4-D. This work paves the way to new studies of auxin action in plant development.

Publicerad i

PLoS ONE
2016, volym: 11, nummer: 7
Utgivare: PUBLIC LIBRARY SCIENCE

SLU författare

• Robert, Stephanie

  • Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet
    

• Novak, Ondrej

  • Akademie věd České republiky

UKÄ forskningsämne

Biokemi och molekylärbiologi
Biokemi
Molekylärbiologi

Publikationens identifierare

• DOI: https://doi.org/10.1371/journal.pone.0159269

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/79533