title: A rapid and efficient method for uniform gene expression using the barley stripe mosaic virus.
abstract: BACKGROUND
  The barley stripe mosaic virus (BSMV) has become a popular vector to study gene function in cereals. However, studies have been limited to gene silencing in leaves of barley or wheat. In addition, the method produces high variability between different leaves and plants. To overcome these limitations, we explored the potential of modifying the inoculation protocol for BSMV gene overexpression. An improved light, oxygen or voltage-sensing (iLOV) domain-based fluorescent protein was used as a reporter of gene expression to monitor the infection and spread of BSMV. Tobacco (Nicotiana benthamiana) leaves were infected via agroinfiltration and the leaves were homogenized to extract the BSMV particles and inoculate wheat tissues using the traditional leaf abrasion method or by incubation during seed imbibition in a Petri dish.
  
  
  RESULTS
  Compared to the leaf abrasion method, the seed imbibition method resulted in a high and uniform detection of iLOV in both roots and leaves of different wheat cultivars and other monocot and dicot species within 7 days after germination. The progression of viral infection via the imbibition method as measured by the expression of iLOV was more stable in different organs and tissues and is transmissible to the next generation.
  
  
  CONCLUSIONS
  Our results show that BSMV can be used as a vector for the expression of small genes such asiLOVin wheat roots and leaves. The inoculation by seed imbibition allows genes to be expressed rapidly and uniformly in wheat and different monocot and dicot species compared to the traditional leaf abrasion method. It also produces high successful transformation as early as 7 days post infection allowing gene function studies during the first generation of infected plants. Furthermore, the method is simple, rapid, and inexpensive compared to the production of transgenic plants.
authors.affiliation: Département des sciences biologiques, Centre TOXEN, Université du Québec à Montréal, Montreal, QC H3C 3P8 Canada.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Cheuk
authors.affiliation: Département des sciences biologiques, Centre TOXEN, Université du Québec à Montréal, Montreal, QC H3C 3P8 Canada.
authors.forename: Mario
authors.identifier: 0000-0003-0099-3404
authors.initials: M
authors.lastname: Houde
keywords: Arabidopsis; Barley; Barley stripe mosaic virus (BSMV); Brachypodium; Gene overexpression; Maize; Nicotiana benthamiana; Wheat