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Protocols for extraction of Brevipalpus phoenicis total RNA and prospecting for RNA interference(RNAi) genes

Grant number: 14/12514-1
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2014
Effective date (End): August 31, 2015
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Valdenice Moreira Novelli
Grantee:Marcelo Campos dos Santos
Home Institution: Instituto Agronômico (IAC). Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil


The citrus industry, of high economic importance to Brazil, is affected by various diseases and pests, especially the citrus leprosis, caused by Citrus leprosis virus C (CiLV-C), and transmitted by B. phoenicis mite (Acari: Tenuipalpidae ). This mite is polyphagous, cosmopolitan, and relevance in agriculture due to its high vectorial capacity, is responsible for the transmission of many other phytovirus in diverse cultures. In citrus orchards, acaricides are expensive and being used extensively in an attempt to control this mite vector. Understanding related to the interaction between plants, virus and B. phoenicis are extremely desirable and still need to be clarified. One possible strategy is to identify the functional genomics (transcriptome) mite, expanding the information about the vector potential generating capacity and information for new methods of management and control. While there have been described several protocols for RNA extraction from mites, specifically for this specie has not yet been established. Previous experience of our group in order to extract genomic DNA to other studies, has shown to be a difficult and laborious work to obtain a standard protocol with quality and concentration of the appropriate sequencing material. Whereas RNA molecules are much more unstable, it is necessary to standardize and optimize the process of obtaining good quality RNA before starting transcriptome studies of this species. Therefore, this proposal aims to test different extraction protocols to B. phoenicis RNA total, in order to get quality and quantity of desirable material for these gene expression studies. A standardized this method of extraction, candidate genes will be explored for application of RNA interference technology, using as reference the genomic databases of Tetranychus urticae, considered the standard for mite genomic studies of B. phoenicis.