Premium
Systemic Acquired Resistance Induced in Tobacco Plants by Localized Virus Infection Does Not Operate Against Challenging Viruses That Infect Systemically
Author(s) -
Pennazio S.,
Roggero P.
Publication year - 1988
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1988.tb04452.x
Subject(s) - tobacco mosaic virus , biology , virology , virus , systemic acquired resistance , tobacco etch virus , tobamovirus , potato virus x , plant virus , microbiology and biotechnology , potyvirus , arabidopsis , gene , biochemistry , mutant
Localized infections produced by tobacco necrosis virus (TNV) or tomato mosaic virus (ToMV) in White Burley tobacco induced a systemic acquired resistance in upper, uninoculated leaves. This resistance was effective against challenge infection by TNV or ToMV but not by potato virus Y, necrotic strain (PVY n ), tobacco mosaic virus (TMV) or tobacco rattle virus (TRV), viruses giving systemic infections. Systemic acquired resistance against TNV or ToMV was expressed as a reduction in lesion size but not in viral antigen content of the resulting necrotic local lesions. The acquisition of resistance was concurrent with an increased capacity of the resistant leaves to convert 1‐aminocyclopropane‐1‐carboxylic acid into ethylene. Systemic acquired resistance was ineffective to contrast or minimize in whatever way the systemic challenge infection produced by PVY N , TMV or TRV. Severity of symptoms and virus multiplication did not differ in resistant leaves from controls. This result does not allow any optimistic promise on possible application of the systemic acquired resistance against severe viral diseases of crops.