Rapid Alkalinization Factor 22 Is a Key Modulator of the Root Hair Growth Responses to Fungal Ethylene Emissions in Arabidopsis

September 2024 in “ PLANT PHYSIOLOGY ”

Rafael J. L. Morcillo, Jesús Leal‐López, Alberto Férez-Gómez, Lidia López‐Serrano, Edurne Baroja‐Fernández, Samuel Gámez‐Arcas, Germán Tortosa, Leonel E. Lopez, José M. Estevez, Verónica G. Doblas, Laura Frías-España, María D. García‐Pedrajas, Jorge Luis Sarmiento-Villamil, Javier Pozueta‐Romero

TLDR RALF22 is essential for root hair growth in response to fungal emissions in Arabidopsis.

The study investigates the role of RAPID ALKALINIZATION FACTOR 22 (RALF22) in the root hair (RH) growth response of Arabidopsis to volatile compounds (VCs) emitted by the fungus Penicillium aurantiogriseum. It was found that RALF22 is crucial for RH proliferation and elongation, as plants with impaired RALF22 or its receptor FERONIA showed weak responses to fungal VCs. The study highlights that RALF22 is involved in ethylene, auxin, and photosynthesis signaling pathways, which are essential for RH growth. Additionally, plants with defects in ethylene synthesis or photosynthetic responsiveness exhibited reduced RALF22 expression and RH growth, underscoring the importance of RALF22 in modulating RH responses to fungal ethylene emissions.

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