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Mapping and identification of cassava mosaic geminivirus genome sequences for efficient siRNA expression and RNAi based virus resistance by transient agro-infiltration studies.

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Title Mapping and identification of cassava mosaic geminivirus genome sequences for efficient siRNA expression and RNAi based virus resistance by transient agro-infiltration studies.
Not Available
 
Creator Basavaprabhu L. Patil*
B. Bagewadi
J. S. Yadav
C. M. Fauquet
 
Subject Geminivirus
RNAi
Virus Resistance
 
Description Not Available
Geminiviruses are among the most serious pathogens of many economically important crop plants and RNA interference (RNAi) is an important strategy for their control. Although any fragment of a viral genome can be used to generate a double stranded (ds) RNA trigger, the precursor for generation of siRNAs, the exact sequence and size requirements for efficient gene silencing and virus resistance have so far not been investigated. Previous efforts to control geminiviruses by gene silencing mostly targeted AC1, the gene encoding replication-associated protein. In this study we made RNAi constructs for all the genes of both the genomic components (DNA-A and DNA-B) of African cassava mosaic virus (ACMV-CM), one of the most devastating geminiviruses causing cassava mosaic disease (CMD) in Africa. Using transient agro-infiltration studies, RNAi constructs were evaluated for their ability to trigger gene silencing against the invading virus and protection against it. The results show that the selection of the DNA target sequence is an important determinant for the amount of siRNA produced and the extent of resistance. The ACMV genes AC1, AC2, AC4 from DNA-A and BC1 from DNA-B were effective targets for RNAi-mediated resistance and their siRNA expression was higher compared to other RNAi constructs. The RNAi construct targeting AC2, the suppressor of gene silencing of ACMV-CM gave highest level of resistance in the transient studies. This is the first report of targeting DNA-B to confer resistance to a bipartite geminivirus infection.
Not Available
 
Date 2019-03-19T05:46:34Z
2019-03-19T05:46:34Z
2016-01-01
 
Type Research Paper
 
Identifier B. L. Patil*, B. Bagewadi, J. S. Yadav and C. M. Fauquet. (2016) Mapping and identification of cassava mosaic geminivirus genome sequences for efficient siRNA expression and RNAi based virus resistance by transient agro-infiltration studies. Virus Research. 213: 109-115.
http://dx.doi.org/10.1016/j.virusres.2015.11.011
http://krishi.icar.gov.in/jspui/handle/123456789/17450
 
Language English
 
Relation Not Available;
 
Publisher Virus Research