The Arabidopsis Cop9 signalosome subunit 4 (CNS4) is involved in adventitious root formation

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Pacurar, Daniel Ioan | Pacurar, Monica Lacramioara | Lakehal, Abdellah | Pacurar, Andrea Mariana | Ranjan, Alok | Bellini, Catherine

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Pacurar, D. I. (Auteur de correspondance), Pacurar, M. L., Lakehal, A. (Co-premier auteur), Pacurar, A. M. (Co-premier auteur), Ranjan, A., Bellini, C. (2017). Erratum: The Arabidopsis Cop9 signalosome subunit 4 (CSN4) is involved in adventitious root formation [Scientific Reports 7, 628 (2017)]. Scientific Reports, 7. DOI : 10.1038/s41598-017-04861-9 http://prodinra.inra.fr/record/408694. The COP9 signalosome (CSN) is an evolutionary conserved multiprotein complex that regulates many aspects of plant development by controlling the activity of CULLIN-RING E3 ubiquitin ligases (CRLs). CRLs ubiquitinate and target for proteasomal degradation a vast number of specific substrate proteins involved in many developmental and physiological processes, including light and hormone signaling and cell division. As a consequence of CSN pleiotropic function, complete loss of CSN activity results in seedling lethality. Therefore, a detailed analysis of CSN physiological functions in adult Arabidopsis plants has been hampered by the early seedling lethality of csn null mutants. Here we report the identification and characterization of a viable allele of the Arabidopsis COP9 signalosome subunit 4 (CSN4). The allele, designated csn4-2035, suppresses the adventitious root (AR) phenotype of the Arabidopsis superroot2-1 mutant, potentially by altering its auxin signaling. Furthermore, we show that although the csn4-2035 mutation affects primary and lateral root (LR) formation in the 2035 suppressor mutant, CSN4 and other subunits of the COP9 complex seem to differentially control AR and LR development.

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