%0 Journal Article %A Dumas, E. %A Lherminier, J. %A Gianinazzi, S. %A White, R. F. %A Antoniw, J. F. %T Immunocytochemical Location of Pathogenesis-related b1 Protein Induced in Tobacco Mosaic Virus-infected or Polyacrylic Acid-treated Tobacco Plants %D 1988 %J Journal of General Virology, %V 69 %N 10 %P 2687-2694 %@ 1465-2099 %R https://doi.org/10.1099/0022-1317-69-10-2687 %K polyacrylic acid %K protein b1 %K TMV %I Microbiology Society, %X Summary Pathogenesis-related b1 (PR-b1) protein and other serologically related PR-b proteins, known to be associated with both tobacco mosaic virus infection and chemical treatments, such as with polyacrylic acid (PAA), were detected by immunofluorescence microscopy around epidermal, palisade and lacunar leaf cells in hypersensitive tobacco plants (PAA+ line). After gentle fixation and embedding in Lowicryl K4M, PR-b proteins revealed by immunogold labelling were located in the cytoplasm and apoplast. After fixation and embedding in Epon, the PR-b proteins were found to accumulate mainly in the intercellular spaces. These observations support results obtained from biochemical tests. %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-69-10-2687