Interaction of the Vacuolar H+-Pyrophosphatase AVP1 with the Secondary Transporters AtNHX1 and SOS1 in Arabidopsis Thaliana: Implications in Salt Tolerance and Mineral Nutrition

    January 2006 in “ OpenCommons at University of Connecticut (University of Connecticut) ”
    Soledad Undurraga
    TLDR Overexpressing AVP1 and AtNHX1 in plants improves salt tolerance and root hair development.
    The study explored the interaction between the vacuolar H+-pyrophosphatase AVP1 and secondary transporters AtNHX1 and SOS1 in Arabidopsis thaliana, focusing on salt tolerance and mineral nutrition. Transgenic plants overexpressing AVP1 and AtNHX1 showed enhanced salt tolerance, with AVP1OX/AtNHX1OX double transgenic lines exhibiting even greater tolerance and novel phenotypes like improved root hair development. However, Arabidopsis loss-of-function mutants sos1-1, sos2-2, and sos3-1 remained salt-sensitive despite AVP1 overexpression, indicating an epistatic effect of sos mutations. The sos1-1 mutants also showed reduced shoot biomass and root hair growth under low potassium or iron conditions, suggesting a role in nutrient uptake regulation through PM H+-ATPase activity.
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