title: Agrobacterium tumefaciens-mediated transformation of the causative agent of Valsa canker of apple tree Valsa mali var. mali.
abstract: Valsa mali var. mali (Vmm), which is the causative agent of Valsa canker of apple tree, causes heavy damage to apple production in eastern Asia. In this article, we report Agrobacterium tumefaciens-mediated transformation (ATMT) of Vmm and expression of gfp (green fluorescent protein) in this fungus. The transformation system was optimized to a transformation efficiency of approximately 150 transformants/10(6) conidia, and a library containing over 4,000 transformants was generated. The tested transformants were mitotically stable. One hundred percent hph (hygromycin B phosphotransferase) integration into Vmm was identified by PCR and five single-copy integration of T-DNA was detected in the eighteen transformants by Southern blot. To our knowledge, this is the first report of ATMT of Vmm. Furthermore, this library has been used to identify genes involved in the virulence of the pathogen, and the transformation system may also be useful to the transformation of other species of the genus Valsa.
authors.affiliation: State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, 712100, People's Republic of China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Hu
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Dai
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Liu
authors.forename: Zhe
authors.initials: Z
authors.lastname: Yang
authors.forename: Na
authors.initials: N
authors.lastname: Song
authors.forename: Xiaoning
authors.initials: X
authors.lastname: Gao
authors.forename: Ralf Thomas
authors.initials: RT
authors.lastname: Voegele
authors.forename: Zhensheng
authors.initials: Z
authors.lastname: Kang
authors.forename: Lili
authors.initials: L
authors.lastname: Huang
mesh_terms: D016960:Agrobacterium tumefaciens / Q000235:genetics*; D001203:Ascomycota / Q000235:genetics*; D015139:Blotting, Southern; D015870:Gene Expression; D017930:Genes, Reporter; D049452:Green Fluorescent Proteins / Q000032:analysis / Q000235:genetics; D027845:Malus / Q000382:microbiology*; D010935:Plant Diseases / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D011995:Recombination, Genetic; D014170:Transformation, Genetic; D014197:Trees / Q000382:microbiology
chemical_list: D049452:Green Fluorescent Proteins