Genomics of Helper Component Proteinase Reveals Effective Strategy for Papaya Ringspot Virus Resistance
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Papaya ringspot virus (PRSV) causes severe economic losses in both cucurbits and papaya throughout the tropics and subtropics. Development of PRSV-resistant transgenic plants faces a major hurdle in achieving resistance against geographically distinct isolates. One of the major reasons of failing to achieve the broad-spectrum PRSV resistance is the involvement of silencing suppressor proteins of viral origin. Here, based on sequence profile of silencing suppressor protein, HcPro, we show that PRSV-HcPro, acts as a suppressor of RNA silencing through micro RNA binding in a dose- dependent manner. In planta expression of PRSV-HcPro affects developmental biology of plants, suggesting the interference of suppressor protein in micro RNA-directed regulatory pathways of plants. Besides facilitating the establishment of PRSV, it showed strong positive synergism with other heterologous viruses as well. This study provides a strategy to develop effective and stable PRSV-resistant transgenic plants.
KeywordsSilencing suppressor Potyvirus miRNA HcPro Electrophoretic mobility shift assay
Satendra K. Mangrauthia was supported by a fellowship from Council of Scientific & Industrial Research (CSIR), New Delhi. Financial support by Department of Biotechnology, Govt. of India is highly acknowledged. Authors are thankful to Ms. Mansi for her useful suggestions in manuscript preparation.
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