title: RNA interference identifies a calcium-dependent protein kinase involved in Medicago truncatula root development.
abstract: Changes in cellular or subcellular Ca2+ concentrations play essential roles in plant development and in the responses of plants to their environment. However, the mechanisms through which Ca2+ acts, the downstream signaling components, as well as the relationships among the various Ca2+-dependent processes remain largely unknown. Using an RNA interference-based screen for gene function in Medicago truncatula, we identified a gene that is involved in root development. Silencing Ca2+-dependent protein kinase1 (CDPK1), which is predicted to encode a Ca2+-dependent protein kinase, resulted in significantly reduced root hair and root cell lengths. Inactivation of CDPK1 is also associated with significant diminution of both rhizobial and mycorrhizal symbiotic colonization. Additionally, microarray analysis revealed that silencing CDPK1 alters cell wall and defense-related gene expression. We propose that M. truncatula CDPK1 is a key component of one or more signaling pathways that directly or indirectly modulates cell expansion or cell wall synthesis, possibly altering defense gene expression and symbiotic interactions.
authors.affiliation: Department of Plant Biology, University of Minesota, St. Paul, Minesota 55108, USA.
authors.forename: Sergey
authors.initials: S
authors.lastname: Ivashuta
authors.forename: Jinyuan
authors.initials: J
authors.lastname: Liu
authors.forename: Junqi
authors.initials: J
authors.lastname: Liu
authors.forename: Dasharath P
authors.initials: DP
authors.lastname: Lohar
authors.forename: Sajeet
authors.initials: S
authors.lastname: Haridas
authors.forename: Bruna
authors.initials: B
authors.lastname: Bucciarelli
authors.forename: Kathryn A
authors.initials: KA
authors.lastname: VandenBosch
authors.forename: Carroll P
authors.initials: CP
authors.lastname: Vance
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Harrison
authors.forename: J Stephen
authors.initials: JS
authors.lastname: Gantt
mesh_terms: D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D002118:Calcium / Q000378:metabolism; D020013:Calcium Signaling / Q000502:physiology; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D002473:Cell Wall / Q000201:enzymology / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic / Q000502:physiology; D018506:Gene Expression Regulation, Plant / Q000235:genetics; D020868:Gene Silencing / Q000502:physiology; D007113:Immunity, Innate / Q000235:genetics; D046913:Medicago truncatula / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development*; D010935:Plant Diseases / Q000235:genetics; D018517:Plant Roots / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development*; D011494:Protein Kinases / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D034622:RNA Interference / Q000502:physiology; D015398:Signal Transduction / Q000235:genetics; D013559:Symbiosis / Q000235:genetics; D017871:Calcium-Calmodulin-Dependent Protein Kinases
chemical_list: D029681:Arabidopsis Proteins; D002118:Calcium; D002135:Calcium-Binding Proteins; D011494:Protein Kinases; C490306:ATCDPK1 protein, Arabidopsis; D017871:Calcium-Calmodulin-Dependent Protein Kinases