title: Soybean mosaic virus helper component-protease enhances somatic embryo production and stabilizes transgene expression in soybean.
abstract: Soybean mosaic virus (SMV) helper component protease (HC-Pro), a suppressor of post-transcriptional gene silencing, was evaluated for its ability to enhance production of soybean hygromycin-resistant somatic embryos (HR-SEs), and stabilize transgene expression. Immature soybean cotyledonary explants were co-cultured with Agrobacterium tumefaciens strain KYRT1 harboring either pCAMBIA1302, carrying a hygromycin phosphotransferase gene (hpt) and a gene encoding green fluorescent protein; pCAMBIA1305.1, carrying hpt and beta-glucuronidase (uidA) genes; pG2-HC-Pro, a derivative of pCAMBIA1305.1 containing SMV G2 HC-Pro; or pG5-HC-Pro, a derivative of pCAMBIA1305.1 containing SMV G5 HC-Pro, but lacking uidA. Significantly (rho<0.02) higher numbers of HR-SEs were obtained from explants transformed with Agrobacterium harboring either pG2-HC-Pro or pG5-HC-Pro than with either of the vector controls (pCAMBIA1302 or pCAMBIA1305.1). Beta-glucuronidase (GUS) expression was significantly (rho<0.003) higher in 50-day-old transgenic plants expressing GUS along with SMV-HC-Pro and in SMV-infected GUS transgenic plants than in transgenic plants expressing GUS alone. Together, these data suggest that SMV-HC-Pro enhanced recovery of HR-SEs by suppressing silencing of the hygromycin phosphotransferase gene.
authors.affiliation: Department of Crop Sciences University of Illinois, 1102 Goodwin Avenue, Urbana, IL 61801, USA.
authors.forename: Hyoun-Sub
authors.initials: HS
authors.lastname: Lim
authors.forename: Tae-Seok
authors.initials: TS
authors.lastname: Ko
authors.forename: Kris N
authors.initials: KN
authors.lastname: Lambert
authors.forename: Hong-Gi
authors.initials: HG
authors.lastname: Kim
authors.forename: Schuyler S
authors.initials: SS
authors.lastname: Korban
authors.forename: Glen L
authors.initials: GL
authors.lastname: Hartman
authors.forename: Leslie L
authors.initials: LL
authors.lastname: Domier
mesh_terms: D001483:Base Sequence; D015152:Blotting, Northern; D015139:Blotting, Southern; D017931:DNA Primers; D018744:DNA, Plant / Q000235:genetics; D018506:Gene Expression Regulation, Plant; D009029:Mosaic Viruses / Q000201:enzymology*; D010447:Peptide Hydrolases / Q000378:metabolism*; D010957:Plasmids; D018749:RNA, Plant / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012639:Seeds / Q000254:growth & development*; D013025:Glycine max / Q000196:embryology / Q000235:genetics / Q000821:virology*; D019076:Transgenes
chemical_list: D017931:DNA Primers; D018744:DNA, Plant; D018749:RNA, Plant; D010447:Peptide Hydrolases