Jocelyn Malamy and Daniel F Klessig* . Waksman Institute, Rutgers, The State University of New Jersey, Piscaraway, NJ 08855, USA to the vicinity of the lesion area and the rest of the plant remains unharmed. The mechanism of the HR is not fully understood, but its occurrence coincides with a myriad of physiological, molecular, and biochemical events. Among these events are: (1)the productionof low molecular weight antimicrobial compounds termed phytoalexins; (2) the increased expression of genes encoding enzymes in the phenylpropanoid pathway, which leads to the production of phytoalexins and other phenolic compounds; (3) the synthesis and incorporationof lignin, hydroxyproline-rich glycoproteins (HRGPs) and phenolic materials into cell walls, apparently fortifying the plantâs structural defenses; (4) increased peroxidase activity, which is necessary for lignin biosynthesis, cross-linking of cell wall proteins and suberization; (5) the appearance of relatively uncharacterized antiviral activities, some of which appear to be due to novel proteins; (6) the expression of genes encoding proteinase inhibitors that can inhibit insect and microbial proteinases; (7) the expression of genes encoding the pathogenesis-related (PR) proteins. The PR proteins are divided into five or more unrelated families. Two of these families encode the hydrolytic enzymes chitinase and P1,3-glucanase, which can
The Plant Journal – Wiley
Published: Sep 1, 1992
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