O-Glycosylated Cell Wall Proteins Are Essential in Root Hair Growth

    June 2011 in “ Science ”
    Silvia M. Velasquez, Martiniano M. Ricardi, Javier Gloazzo Dorosz, Paula Virginia Fernández, Alejandro D. Nadra, Laércio Pol-Fachin, Jack Egelund, Sascha Gille, Jesper Harholt, Marina Ciancia, Hugo Verli, Markus Pauly, Antony Bacic, Carl Erik Olsen, Peter Ulvskov, Bent Larsen Petersen, Chris Somerville, Norberto D. Iusem, José M. Estevez
    Studysummary In Arabidopsis thaliana, this study found that proper O-glycosylation of extensins is crucial for root hair elongation and self-assembly of the cell wall. Our plain-language summary of this paper — not a Tressless recommendation.
    The study concluded that O-glycosylated cell wall proteins, specifically hydroxyproline-rich glycoproteins (HRGPs) like extensins (EXTs), were essential for root hair growth in Arabidopsis thaliana. Disruption of prolyl 4-hydroxylases (P4Hs) or arabinosyltransferases blocked polarized growth in root hairs and reduced arabinosylation of EXTs, indicating that proper O-glycosylation was crucial for cell-wall self-assembly and root hair elongation. The research involved various techniques, including confocal microscopy and molecular modeling, and highlighted the importance of these glycoproteins in nutrient absorption and plant health.
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