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Proteins in the intercellular fluid (IF) of healthy Lupinus albus leaves were characterized. Silver staining of the proteins separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed more than 30 polypeptides, with the major ones having a molecular mass lower than 36 kD. After amino-terminal amino acid sequence analysis, one of the major polypeptides, IF4, was shown to have no identity with any of the proteins present in the data bases. Two others, IF1 and IF3, showed identity with previously reported pathogenesis-related proteins, IF1 with an antifungal protein from Hordeum vulgare that belongs to the thaumatin family (PR-5 family), and IF3 with class III chitinase-lysozymes. IF3 was also present in the IF of stem and root and it represents the major polypeptide in the medium of L. albus cell-suspension cultures. The ubiquitous presence of this enzyme in healthy, nonstressed tissues of L. albus cannot be explained.

Study of the Intercellular Fluid of Healthy Lupinus albus Organs (Presence of a Chitinase and a Thaumatin-Like Protein)