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PLANT PHYSIOLOGY , Vol 109, Issue 4 1345-1351, Copyright © 1995 by American Society of Plant Biologists

PLANT-MICROBE AND PLANT-INSECT INTERACTIONS

Lupinus albus L. Pathogenesis-Related Proteins That Show Similarity to PR-10 Proteins

P. M. Pinto and CPP. Ricardo
Instituto de Tecnologia Quimica e Biologica, R. da Quinta Grande, 6, apt 127, 2780 Oeiras, Portugal (M.P.P., C.P.P.R.); Escola Superior Agraria, apt 310, Santarem, Portugal (M.P.P.)

We describe a group of three acidic proteins, pathogenesis-related (PR)-p16.5a, PR-p16.5b, and PR-p16.5c, that accumulate in the leaves of Lupinus albus L. cv Rio Maior plants when infected with the fungus Colletotrichum gloeosporioides Penz. These proteins co-migrate in sodium dodecyl sulfate-polyacrylamide gels as a single band of 16.5 kD, behaving as charge isomers, and are related to several members of the defense-related PR-10 protein family. Localization of the proteins was investigated by techniques of tissue printing and immunogold electron microscopy; they are predominantly associated with the vascular system and are localized extra-cellularly. The accumulation of PR-p16.5a, PR-p16.5b, and PR-p16.5c also seems to be induced by cucumber mosaic virus and by two forms of abiotic stress, salicylic acid and ultraviolet, suggesting a general defense role for these proteins.


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