title: Expression Analysis of Hairpin RNA CarryingSugarcane mosaic virus(SCMV) Derived Sequences and Transgenic Resistance Development in a Model Rice Plant.
abstract: Developing transgenic resistance in monocotyledonous crops against pathogens remains a challenging area of research.Sugarcane mosaic virus(SCMV) is a serious pathogen of many monocotyledonous crops including sugarcane. The objective of present study was to analyze transgenic expression of hairpin RNA (hpRNA), targeting simultaneouslyCP(Coat Protein) andHc-Pro(helper component-proteinase) genes of SCMV, in a model rice plant. Conserved nucleotide sequences, exclusive for DAG (Aspartic acid-Alanine-Glycine) and KITC (Lycine-Isoleucine-Threonine-Cysteine) motifs, derived from SCMVCPandHc-Progenes, respectively, were fused together and assembled into the hpRNA cassette under maize ubiquitin promoter to form Ubi-hpCP:Hc-Pro construct. The same CP:Hc-Pro sequence was fused with theβ-glucuronidase gene (GUS) at the 3' end under CaMV 35S promoter to develop 35S-GUS:CP:Hc-Pro served as a target reporter gene construct. When delivered into rice callus tissues by particle bombardment, the Ubi-hpCP:Hc-Pro construct induced strong silencing of 35S-GUS:CP:Hc-Pro. Transgenic rice plants, containing Ubi-hpCP:Hc-Pro construct, expressed high level of 21-24 nt small interfering RNAs, which induced specific suppression against GUS:CP:Hc-Pro delivered by particle bombardment and conferred strong resistance to mechanically inoculated SCMV. It is concluded that fusion hpRNA approach is an affordable method for developing resistance against SCMV in model rice plant and it could confer SCMV resistance when transformed into sugarcane.
authors.affiliation: Atta-ur-Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan.
authors.forename: Sehrish
authors.initials: S
authors.lastname: Akbar
authors.affiliation: Atta-ur-Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan.
authors.forename: Muhammad
authors.identifier: 0000-0002-4025-852X
authors.initials: M
authors.lastname: Tahir
authors.affiliation: Commonwealth Scientific Industrial and Research Organization, Agriculture, GPO Box 1600, Canberra, ACT 2601, Australia.
authors.forename: Ming-Bo
authors.initials: MB
authors.lastname: Wang
authors.affiliation: Commonwealth Scientific Industrial and Research Organization, Agriculture, GPO Box 1600, Canberra, ACT 2601, Australia.
authors.forename: Qing
authors.initials: Q
authors.lastname: Liu
mesh_terms: D001483:Base Sequence; D019470:Biolistics; D015139:Blotting, Southern; D003546:Cysteine Endopeptidases / Q000235:genetics; D060467:Disease Resistance / Q000235:genetics*; D015870:Gene Expression; D020868:Gene Silencing; D009690:Nucleic Acid Conformation; D012275:Oryza / Q000276:immunology* / Q000821:virology*; D010935:Plant Diseases / Q000821:virology*; D030821:Plants, Genetically Modified; D017800:Potyvirus / Q000235:genetics*; D034741:RNA, Small Interfering / Q000378:metabolism; D012367:RNA, Viral / Q000737:chemistry / Q000235:genetics*; D019076:Transgenes; D014764:Viral Proteins / Q000235:genetics
chemical_list: D034741:RNA, Small Interfering; D012367:RNA, Viral; D014764:Viral Proteins; D003546:Cysteine Endopeptidases; C072775:HC-Pro protein, potyvirus