Systemic Acquired Resistance Induced in Tobacco Plants by Localized Virus Infection Does Not Operate Against Challenging Viruses That Infect Systemically

Abstract

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 (PVYn), 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 PVYN, 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.

Effect of Agaricus brasiliensis and Lentinula edodes mushrooms on the infection of passionflower with Cowpea aphid-borne mosaic virus

“…In this case, C. quinoa presented genetic factors that avoided the CABMV systemic movement and was able to respond to the inducers positively. Results similar to those presented here were obtained by Pennazio and Roggero (1988) Several studies have shown systemic resistance induction against local lesion viruses, but the treatment's inefficiency against systemic invasion by viruses is of little value to the disease control. The aphid vectors in the field transmit the CABMV in a non-persistent way, through the feeding-probe with their stylets.…”

Systemic Acquired Resistance to Virus Infections and Ethylene Biosynthesis in Asparagus Bean

“…Plants of asparagus bean {Vigna sesquipedalis Fruhw.) were grown from seed as previously described (PENNAZIO et al 1987). Their primary leaves were inoculated with tobacco necrosis virus (TNV) or tobacco rattle virus (TRV) (inducing inoculation).…”

“…Basal ethylene was determined in trifoliate induced and control leaves 3 days after inducing inoculation, after 1 h incubation in darkened sealed vials. Samples of ethylene released from leaves were determined by gas chromatography (PENNAZIO and ROGGERO 1990).…”

“…Free ACC was extracted from trifoliate leaves, and determined as previously described (PENNAZIO and ROGGERO 1990).…”

Acquired Resistance in Hypersensitive Tobacco Operates by Limiting Cell‐to‐Cell Spread of Virus Infection without Affecting Virus Multiplication

“…Basically, acquired resistance against local lesion-producing challenging viruses operates in limiting the number and size of lesions, whereas virus accumulation in these lesions does not appear to be affected (for references, see PENNAZIO and ROGGERO 1988). STEIN et al (1985), however, found that acquired resistance to TMV in N. tahacum cv.…”