TY - JOUR
T1 - Class III Peroxidases PRX01, PRX44, and PRX73 Control Root Hair Growth in Arabidopsis thaliana
AU - Marzol, Eliana
AU - Borassi, Cecilia
AU - Sardoy, Mariana Carignani
AU - Ranocha, Philippe
AU - Aptekmann, Ariel A.
AU - Bringas, Mauro
AU - Pennington, Janice
AU - Paez-Valencia, Julio
AU - Pacheco, Javier Martínez
AU - Rodríguez-Garcia, Diana R.
AU - Guerrero, Yossmayer Del Carmen Rondón
AU - Peralta, Juan Manuel
AU - Fleming, Margaret
AU - Mishler-Elmore, John W.
AU - Mangano, Silvina
AU - Blanco-Herrera, Francisca
AU - Bedinger, Patricia A.
AU - Dunand, Christophe
AU - Capece, Luciana
AU - Nadra, Alejandro D.
AU - Held, Michael
AU - Otegui, Marisa S.
AU - Estevez, José M.
N1 - Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/5/2
Y1 - 2022/5/2
N2 - Root hair cells are important sensors of soil conditions. They grow towards and absorb water-soluble nutrients. This fast and oscillatory growth is mediated by continuous remodeling of the cell wall. Root hair cell walls contain polysaccharides and hydroxyproline-rich glycoproteins, including extensins (EXTs). Class-III peroxidases (PRXs) are secreted into the apoplastic space and are thought to trigger either cell wall loosening or polymerization of cell wall components, such as Tyr-mediated assembly of EXT networks (EXT-PRXs). The precise role of these EXT-PRXs is unknown. Using genetic, biochemical, and modeling approaches, we identified and characterized three root-hair-specific putative EXT-PRXs, PRX01, PRX44, and PRX73. prx01,44,73 triple mutation and PRX44 and PRX73 overexpression had opposite effects on root hair growth, peroxidase activity, and ROS production, with a clear impact on cell wall thickness. We use an EXT fluorescent reporter with contrasting levels of cell wall insolubilization in prx01,44,73 and PRX44-overexpressing background plants. In this study, we propose that PRX01, PRX44, and PRX73 control EXT-mediated cell wall properties during polar expansion of root hair cells.
AB - Root hair cells are important sensors of soil conditions. They grow towards and absorb water-soluble nutrients. This fast and oscillatory growth is mediated by continuous remodeling of the cell wall. Root hair cell walls contain polysaccharides and hydroxyproline-rich glycoproteins, including extensins (EXTs). Class-III peroxidases (PRXs) are secreted into the apoplastic space and are thought to trigger either cell wall loosening or polymerization of cell wall components, such as Tyr-mediated assembly of EXT networks (EXT-PRXs). The precise role of these EXT-PRXs is unknown. Using genetic, biochemical, and modeling approaches, we identified and characterized three root-hair-specific putative EXT-PRXs, PRX01, PRX44, and PRX73. prx01,44,73 triple mutation and PRX44 and PRX73 overexpression had opposite effects on root hair growth, peroxidase activity, and ROS production, with a clear impact on cell wall thickness. We use an EXT fluorescent reporter with contrasting levels of cell wall insolubilization in prx01,44,73 and PRX44-overexpressing background plants. In this study, we propose that PRX01, PRX44, and PRX73 control EXT-mediated cell wall properties during polar expansion of root hair cells.
KW - Arabidopsis
KW - cell walls
KW - class-III peroxidases
KW - extensins
KW - root hairs
KW - ROS
UR - http://www.scopus.com/inward/record.url?scp=85129738061&partnerID=8YFLogxK
U2 - 10.3390/ijms23105375
DO - 10.3390/ijms23105375
M3 - Article
AN - SCOPUS:85129738061
SN - 1661-6596
VL - 23
JO - International Journal of Molecular Sciences
JF - International Journal of Molecular Sciences
IS - 10
M1 - 5375
ER -