Conflicting Auxin-Phosphate Signals Impact on RSL2 Expression and ROS Homeostasis Linked to Root Hair Growth in Arabidopsis

    January 2018 in “ bioRxiv (Cold Spring Harbor Laboratory) ”
    Silvina Mangano, Silvina Paola Denita-Juárez, Eliana Marzol, Cecilia Borassi, José M. Estevez
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    TLDR Auxin helps root hairs grow in high phosphate by affecting ROS and involving RSL2 and RSL4.
    The study examined how root hairs in Arabidopsis managed conflicting signals from high phosphate (Pi) levels, which inhibited growth, and high auxin levels, which promoted growth. It was discovered that auxin could counteract the repressive effects of high Pi on root hair growth through a mechanism involving reactive oxygen species (ROS). The transcription factors RSL2 and RSL4 were essential, with RSL2 being particularly important in mediating the auxin response under high Pi conditions. The research suggested a positive feedback loop between RSL2 and RSL4, affecting ROS homeostasis and root hair growth, highlighting the complexity of hormonal and environmental signal integration in plant cell growth regulation.
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