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The high-quality regulatory support for the use of plant genome editing technology is an urgent scientific and practical task of modern agriculture. Currently, the status of plants obtained using genomic editing (GE) technologies is not defined in Russian legislation. The article describes the principles and mechanism of CRISPR/Cas9 technology, and discusses the biological safety of the GE-plants. Fundamentally different approaches to genetically modified (GM) and GE-plants in the world are analyzed. We discuss the problems and contradictions of extending the GM-plants legal regulation to GE-plants. In particular, the European Court of Justice decision that extended the European GM-plants legislation for GE-plants. It is proposed to determine the legal status of GE-plants in Russian legislation, taking into account existing international practices, and protect the interests of the government in the field of biological and food security.

VirE2 is a ssDNA binding protein essential for virulence in Agrobacterium tumefaciens. A tetracysteine mutant (VirE2-TC) was prepared for in vitro and in vivo fluorescence imaging based on the ReAsH reagent. VirE2-TC was found to be biochemically active as it binds both ssDNA and the acidic secretion chaperone VirE1. It was also biologically functional in complementing virE2 null strains transforming Arabidopsis thaliana roots and Nicotiana tabacum leaves. In vitro experiments demonstrated a two-color fluorescent complex using VirE2-TC/ReAsH and Alexa Fluor 488 labeled ssDNA. In vivo, fluorescent VirE2-TC/ReAsH was detected in bacteria and in plant cells at time frames relevant to transformation. Importance Cell to cell transfer of proteins and nucleic acids lies at the heart of many biological processes. Detecting such transfer is often problematic or indirect. We show here that the biarsenical fluorescent reagent ReAsH can be used to reveal the presence of the secreted effector VirE2 from Agrobacterium tumefaciens in the cytoplasm of host plant cells. Our studies establish a new method for monitoring translocation of the VirE2 effector from A. tumefaciens to plant target cells during the infection process.

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