The co-chaperone p23 controls root development through the modulation of auxin distribution in the Arabidopsis root meristem

Stefano d'Alessandro (1) , Serena Golin (1) , Christian Hardtke (2) , Fiorella Lo Schiavo (1) , Michela Zottini (1)

1 Unipd - Università degli Studi di Padova = University of Padua
2 UNIL - Université de Lausanne = University of Lausanne

Homologues of the p23 co-chaperone of HSP90 are present in all eukaryotes, suggesting conserved functions for this protein throughout evolution. Although p23 has been extensively studied in animal systems, little is known about its function in plants. In the present study, the functional characterization of the two isoforms of p23 in Arabidopsis thaliana is reported, suggesting a key role of p23 in the regulation of root development. Arabidopsis p23 mutants, for either form, show a short root length phenotype with a reduced meristem length. In the root meristem a low auxin level associated with a smaller auxin gradient was observed. A decrease in the expression levels of PIN FORMED PROTEIN (PIN)1, PIN3, and PIN7, contextually to an inefficient polar localization of PIN1, was detected. Collectively these results suggest that both Arabidopsis p23 isoforms are required for root growth, in particular in the maintenance of the root meristem, where the proteins are located.

Keywords: Arabidopsis; auxin; p23-chaperone; pin formed protein (PIN); polar auxin transport; root growth

Domains: Life Sciences [q-bio]; Vegetal Biology; Life Sciences [q-bio]; Cellular Biology; Life Sciences [q-bio]; Biochemistry, Molecular Biology; Life Sciences [q-bio]; Biotechnology

Stefano d'Alessandro, Serena Golin, Christian Hardtke, Fiorella Lo Schiavo, Michela Zottini. The co-chaperone p23 controls root development through the modulation of auxin distribution in the Arabidopsis root meristem. Journal of Experimental Botany, 2015, 66 (16), pp.5113-5122. ⟨10.1093/jxb/erv330⟩. ⟨hal-03303939⟩