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Alleles of avirulence gene D (avrD) specify the production by bacteria of syringolides that elicit the hypersensitive response in soybean (Glycine max) plants carrying the disease-resistance gene Rpg4, but not rpg4 plants. Syringolide 1 caused extracellular alkalization, K+ efflux, and Ca2+ influx about 30 min after addition to suspension-cultured cells of two Rpg4 cultivars, Harosoy and Flambeau, but not in two rpg4 cultivars, Acme and Merit. All responses were sustained for at least 1.5 h and were inhibited by La3+, which blocks certain Ca2+ channels. These results suggest that syringolide 1 activates a Ca2+ influx-dependent signaling pathway only in Rpg4 soybean cells.

Syringolide 1 Triggers Ca2+ Influx, K+ Efflux, and Extracellular Alkalization in Soybean Cells Carrying the Disease-Resistance Gene Rpg4