Understanding the transmission and biological aspects of an emerging geminivirus in maize crop in Brazil

• Grant number: 21/14945-3
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date until: July 01, 2022
• End date until: February 28, 2025
• Field of knowledge: Agronomical Sciences - Agronomy - Plant Health
• Principal Investigator: Joao Roberto Spotti Lopes
• Grantee: Euclides de Sousa Vilanova
• Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

Maize Striate Mosaic Virus (MSMV; Geminiviridae; Mastrevirus) is a new virus detected in maize in Brazil. Viruses belonging to the genus Mastrevirus are transmitted by leafhopper. Recently, MSMV transmission by the Corn Leafhopper Dalbulus maidis (DeLong & Wolcott) (Hemiptera: Cicadellidae) was demonstrated by our research group. However, lack information on transmission characteristics, occurrence of other species of potential vector leafhopper and host plant. The potential impact of MSMV on maize is also unknown. Thus, the present research project aims to characterize the transmission of MSMV by D. maidis in terms of persistence (a); evaluate the specificity of MSMV transmission by leafhopper (b); determine the range of host plants of MSMV (c ); and evaluate the impact of mixed infection on the pathogenicity and transmission of MSMV by D. maidis (d). Know the persistence ("half-life") of the virus in the vector is important, because if prolonged (weeks), increase chance of primary and secondary dissemination. Alternative host plants can serve as a natural reservoir of the virus for primary dissemination, while the occurrence of other vectors can increase this host range and, therefore, the possibilities for primary dissemination. Mixed viral infection are frequent in maize, which hosts several viruses, which can result in synergism with potential increase in damage and transmission efficiency. Thus, this study will provide important information about the transmission and biological characteristics of MSMV, allowing to understand epidemiological aspects of the disease. Therefore, this information can support effective strategies and tactics for management the disease. (AU)