Health & Environmental Research Online (HERO)


Print Feedback Export to File
1519070 
Journal Article 
Auxin and its transport play a role in plant tolerance to arsenite-induced oxidative stress in Arabidopsis thaliana 
Krishnamurthy, A; Rathinasabapathi, B 
2013 
Plant, Cell and Environment
ISSN: 0140-7791
EISSN: 1365-3040 
36 
10 
1838-1849 
English 
The role of auxin in plant development is well known; however, its possible function in root response to abiotic stress is poorly understood. In this study, we demonstrate a novel role of auxin transport in plant tolerance to oxidative stress caused by arsenite. Plant response to arsenite [As(III)] was evaluated by measuring root growth and markers for stress on seedlings treated with control or As(III)-containing medium. Auxin transporter mutants aux1, pin1 and pin2 were significantly more sensitive to As(III) than the wild type (WT). Auxin transport inhibitors significantly reduced plant tolerance to As(III) in the WT, while exogenous supply of indole-3-acetic acid improved As(III) tolerance of aux1 and not that of WT. Uptake assays using H(3) -IAA showed As(III) affected auxin transport in WT roots. As(III) increased the levels of H2 O2 in WT but not in aux1, suggesting a positive role for auxin transport through AUX1 on plant tolerance to As(III) stress via reactive oxygen species (ROS)-mediated signalling. Compared to the WT, the mutant aux1 was significantly more sensitive to high-temperature stress and salinity, also suggesting auxin transport influences a common element shared by plant tolerance to arsenite, salinity and high-temperature stress. 
arsenite; auxin transport; indole-3-acetic acid; lateral roots; root development 
IRIS
• Arsenic (Inorganic)
     1. Literature
          Lit search updates through Oct 2015
     3. Hazard ID Screening
          Other potentially supporting studies
• Inorganic Arsenic (7440-38-2) [Final 2025]
          PubMed
          Considered New
          PubMed
          Considered New
          PubMed
          WOS
          Considered New
     2. Lit Search Updates through Oct 2015
          PubMed
          WOS
          Considered
     7. Other Studies through Oct 2015
          Ecology