Effect of the concentration of Tomato chlorosis virus (ToCV) on potato in the processes of acquisition and transmission by Bemisia tabaci biotype b

• Grant number: 17/00560-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: April 01, 2017
• End date: December 31, 2018
• Field of knowledge: Agronomical Sciences - Agronomy - Plant Health
• Principal Investigator: Jorge Alberto Marques Rezende
• Grantee: Heron Delgado Kraide
• Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
• Associated research grant: 12/51771-4 - Begomovirus and Crinivirus in Solanaceae: molecular epidemiology and management strategies, AP.TEM

Abstract

Potato (Solanum tuberosum) is the most cultivated and economically important vegetable in Brazil. Culture has always been the target of many diseases and, in recent years, some emerging viruses with high rates of dissemination have cropped up. Among them, a species of the genus Crinivirus stands out, the Tomato chlorosis virus (ToCV). This Crinivirus is efficiently transmitted, semi-persistently, by the Bemidia tabaci biotype B (whitefly), a polyphagous insect and widely disseminated throughout the country. The cultivated potato varieties are susceptible to the virus, however recent studies have indicated significant differences in virus concentration among some genotypes studied. The lower concentration of virus in the tissues of the plant may have an effect on the epidemiology of the disease in the field, since it can affect the acquisition process of the virus by B. tabaci and consequently the later transmission to healthy plants. Therefore, this work has the following objectives: a) to evaluate the efficiency of potato plants of the Camila and Agate varieties as inoculum sources of the ToCV for B. tabaci biotype B and subsequent transmission for tomatoes and b) to quantify the ToCV in the potato varieties inoculum sources and in B tabaci biotype B after The acquisition of the virus. These results are expected to identify characteristics in potato genotypes that may be useful for the development of appropriate management measures of the disease. (AU)