ISHS Acta Horticulturae 394: Plant Bioregulators in Horticulture
STRESS AND ETHYLENE INDUCED PATHOGENESIS-RELATED PROTEINS IN CITRUS |
| Authors: | O. Sagee, Y. Dahan |
| Keywords: | Chitinase, Citron (C. medica L.), Citrus, Ethylene, β-1, 3-Glucanase, Mandarin (C. reticulata), Pummelo (C. grandis) |
| Abstract:
Plants react to various stresses, including attack by pathogens, with an array of defense mechanisms. Part of the plant's defence is the accumulation of a group of proteins that during the last decade was named Pathogenesis-Related (PR) proteins. We describe the characterization of Citrus spp. PR-proteins induced by ethylene and biotic (fungal, viral) or abiotic (calcareous soil, flooding) stress conditions. Ethylene treatment caused a significant increase in the content of the three major PR-protein classes, namely, PR-1, chitinase and  -1,3-glucanase.
Activities of the two enzymes increased 3 to 10 fold in response to treatments of detached citrus leaves with 10 ppm ethylene.
Similarly, in response to citrus exocortis viroid, mal-secco fungal disease and flooding, PR-like proteins could be identified in the extracellular wash.
Our results indicate that in response to various stress conditions citrus plants produce several proteins which serologically and functionally can be identified as members of the three major classes of PR-proteins. | |
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