Open Access

A new BSMV-based vector with modified β molecule allows simultaneous and stable silencing of two genes

  • Adam Kawalek1,
  • Marta Dmochowska-Boguta1,
  • Anna Nadolska-Orczyk1 and
  • Waclaw Orczyk1Email author
Cellular & Molecular Biology LettersAn International Journal201117:41

DOI: 10.2478/s11658-011-0041-9

Received: 4 July 2011

Accepted: 8 December 2011

Published: 28 December 2011

Abstract

Virus-induced gene silencing is an important tool for functional gene analysis and the vector based on Barley stripe mosaic virus (BSMV) is widely used for the purpose in monocots. Of the tripartite BSMV genome, currently the BSMV:γMCS molecule is used to clone a fragment of a target gene. As an alternative, the BSMV:β molecule was engineered with a unique BamHI site between the open reading frame of βc (ORF βc) and poly(A). The mixture of RNA particles α, βBamHI and γMCS was fully infectious. Barley phytoene desaturase and wheat phospholipase Dα fragments were cloned to βBamHI and γMCS. Delivery of the target gene fragment in γMCS induced stronger silencing, while delivery in βBamHI yielded more stable transcript reduction. A quantitative analysis (qRT-PCR) of the transcripts showed that the silencing induced with a fragment carried in both particles was stronger and more stable than that from a fragment placed in one particle. The modification of β enables simultaneous silencing of two genes. Quantifying the β and γ particles in virus-inoculated plants revealed a 2.5-fold higher level of γ than β, while the stability of the insert was higher in β compared with γ. The possible influence of the relative quantity of β and γ particles in virus-inoculated plants on insert stability and gene silencing efficiency is discussed.

Key words

BSMV Cereals Functional analysis Phospholipase D Phytoene desaturase Silencing Wheat Vector stability VIGS

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