Comparison of resistance to potyviruses within Solanaceae: infection of potatoes with tobacco etch potyvirus and peppers with potato A and Y potyviruses

摘要

The reaction of several cultivated potato varieties to 3 strains of tobacco etch potyvirus (TEV-F, TEV-Mex21 and TEV-ATCC) and the reaction of several Capsicum lines (C. annuum and C. chinense) to 2 strains of potato Y potyvirus (PYVO and PYVN) and1 strain of potato A potyvirus (PAV-M) was tested. The potato varieties included in this study carried resistance genes against PYV, PAV and potato V potyvirus, but all were susceptible to TEV and developed mottle and mosaic symptoms. TEV was readily transmitted by mechanical inoculation from tobacco and potato to potato, whereas transmission from Capsicum to potato rarely occurred. TEV was transmitted through potato tubers and from Capsicum to potato plants by aphids. Lack of detectable systemic infection following graft-inoculation indicated extreme resistance to PYVO and PAV in several Capsicum lines. No Capsicum line was systemically infected with PYVN following mechanical inoculation (graft-inoculation was not carried out with PYVN). The development of necrotic lesions following mechanical and graft inoculation suggested a hypersensitive response to PYVO in several Capsicum lines which resembled the resistance responses to these potyvirus strains in potato. It is suggested that C. annuum cv. Avelar is resistant to 4 potyviruses (PYV, PAV, pepper mottle potyvirus (PepMoV) and some isolates of TEV); C. annuum cv. Criollo de Morelos and C. chinense PI 152225 and PI 159236 were resistant to 3 potyviruses (PYV, PepMoV and PAV; and PYV, PepMoV and TEV, respectively); C. annuum 9093-1 and 92016-1 were resistant to PYV and PepMoV; and C. annuum cv. Jupiter and C. annuum cv. RNaky were resistant to PYVN and PAV.