01796naa a2200181 a 450000100080000000500110000800800410001902200140006010000230007424501070009726000090020452013010021365000180151465000180153265000110155070000180156177300350157919851612023-05-25       2014    bl uuuu     u00u1 u    #d  a1812-53871 aOLIVEIRA, A. A. R.  aInduction for resistance to Papaya Black spot elicited by acibenzolar-S-Methyl.h[electronic resource]  c2014  aThe objective of this study was to evaluate the effect of acibenzolar-S-methyl tested at 5 concentrations (O, 1, 5, 25 álld 100 flM a.i.) for its ability to protect papaya (Carica papaya) cv. Rainbow from black spot (Asperisporium caricae) followmg inoculation W1th the fungus. Effects of resistance induction treatrnent against black spot disease were evaluated by measuring the plant height and stem diameter. Disease symptoms were scored weekly by visually estimating disease severity of plants on the basis of a 5-class visual scale of O (no symptoms) to 4 (extensive lesions on leaves). Accumulation of defence-related proteins in papaya leaves were also analysed and compared. Results revealed that the leveI of protection againstA. Caricae was dose-dependent. Maximum reduction of the disease in leaves was obtained with 25-100 flM acibenzolar-S-methyl, with a time interval of 3 days between application of the activator and inoculation with the pathogen. The systemic resistance elicitation was characterized by an increase in 2 pathogenesis-related protems, chitinase and ~-1, 3-glucanase. These results md1cate that acibenzolar-S-methyl induces partial resistance in papaya against black spot disease which may provide the grower a new option for integrated management of the disease.  aAsperisporium  aCarica Papaya  aMamão1 aNISHIJIMA, W.  tPlant Pathology Journal, 2014.