Abstract
Beet necrotic yellow vein virus (BNYVV) is the cause of rhizomania, an important disease of sugar beet around the world. The multipartite genome of the BNYVV contains four or five single-stranded RNA that has been used to characterize the virus. Understanding genome composition of the virus not only determines the degree of pathogenicity but also is required to development of resistant varieties of sugar beet. Resistance to rhizomania has been conferred to sugar beet varieties by conventional breeding methods or modern genome engineering tools. However, over time, viruses undergo genetic alterations and develop new variants to break crop resistance. Here, we report the occurrence of genetic reassortment and emergence of new variants of BNYVV among the isolates of Thrace and Asia Minor (modern-day Turkey). Our findings indicate that the isolates harbor European A-type RNA-2 and RNA-3, nevertheless, RNA-5 is closely related to East Asian J-type. Furthermore, RNA-1 and RNA-4 are either derived from A, B, and P-types or a mixture of them. The RNA-5 factor which enhance the pathogenicity, is rarely found in the isolates studied (20%). The creation of new variants of the virus emphasizes the necessity to develop new generation of resistant crops. We anticipate that these findings will be useful for future genetic characterization and evolutionary studies of BNYVV, as well as for developing sustainable strategies for the control of this destructive disease.
Highlights
Rhizomania is one of the most destructive soil-borne diseases of sugar beet (Beta vulgaris L.) worldwide
Comparative studies revealed that the RNA-1, RNA-4, and RNA-5 contribute to the development of different rhizomania symptoms[7]
To control losses incurred by rhizomania, cultivation of resistant sugar beet cultivars developed through conventional breeding methods and transgenic techniques is considered an effective approach
Summary
Rhizomania is one of the most destructive soil-borne diseases of sugar beet (Beta vulgaris L.) worldwide. Tamada and Baba[2] first identified Beet necrotic yellow vein virus (BNYVV) as the cause of rhizomania when they isolated the virus from infected plants of sugar beet fields in Japan. This disease reduces sugar content by 8%, root yield up to 90%, and sugar yield up to 80%3,4. Studies revealed that the J-type East Asian BNYVV isolates was different from French isolates for the length and the sequence of RNA-57,25. The BNYVV strains isolated from different provinces of Turkey with long history of sugar beet cultivation have been subjected to comprehensive genomic analyses of all the RNA components and further phylogenetic studies were carried out. According to our findings genetic reassortment between the European and East Asian A, B and P types has led to the emergence of new variants of BNYVV in the region of Thrace and Asia Minor (modern-day Turkey)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
