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J Gen Virol 67 (1986), 2135-2143; DOI 10.1099/0022-1317-67-10-2135
© 1986 Society for General Microbiology
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Induction by Salicylic Acid of Pathogenesis-related Proteins and Resistance to Alfalfa Mosaic Virus Infection in Various Plant Species

R. A. M. Hooft Van Huijsduijnen, S. W. Alblas, R. H. De Rijk and J. F. Bol

Department of Biochemistry, State University of Leiden, P.O. Box 9505, 2300 RA Leiden, The Netherlands

Spraying tobacco plants with salicylic acid induces both the synthesis of ‘pathogenesis-related’ (PR) proteins and resistance to viruses that can induce necrotic lesions. We show that spraying Samsun NN tobacco with salicylic acid induced the production of PR-1 mRNAs and inhibited the systemic multiplication of alfalfa mosaic virus (AlMV) by 90%. Salicylic acid treatment also induced the synthesis of PR proteins in bean and cowpea plants, and reduced by 75% the production of local lesions in AlMV-infected bean plants. Salicylic acid inhibited the replication of AlMV in cowpea protoplasts by up to 99%, depending on the mode of application. In AlMV-inoculated cowpea protoplasts, the production of viral minus-strand RNA, plus-strand RNA and coat protein was abolished, indicating that salicylic acid inhibits an early step in the AlMV replication cycle. The viability of the cells and the synthesis of host proteins were not affected by salicylic acid. Another aromatic compound, p-coumaric acid, induced neither PR proteins nor resistance to virus infection.

Keywords: salicylic acid, resistance, pathogenesis-related proteins, alfalfa mosaic virus

Received 28 April 1986; accepted 12 June 1986.




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