Saturday, 15 July 2006

Induced Resistance Against Pseudomonas Syringae pv. Lachrymans in Cucumber by Pantoea spp. Strain HB-22.

Hwangbo Hoon Sr., Jin Rong De, Kim Byung Chun, Kim Kil Yong, and Kim Yong Woong. Division of Applied BioScience and Biotechnology, College of Agriculture and Life Science, Chonnam National Univ, 300, Yong Bong Dong, Buk Ku, Gwangju, South Korea

The effect of induced resistance against angular leaf spot of cucumber (P. syringae pv. lachrymans) following application of Pantoea spp. strain HB-22 on cucumber leaves was investigated. Cucumber roots were treated with HB-22 at 2 and 3 weeks after planting. Control plants received broth culture without bacteria. Pathogen, P. syringae pv. Lachrymans suspension was sprayed on cucumber leaves 4 weeks after planting. Plant fresh weight was the highest in HB-22 treated plant, followed by control, HB-22 + P. syringae pv. lachrymans, and P. syringae pv. lachrymans treated plant where HB-22 reduced disease severity compared to control plants at 10 days after infection. The activities of Pathogenesis-Related (PR) proteins, such as -1,3-glucanase and chitinase had no significant difference among all treatments until 3 days and then increased in P. syringae pv. lachrymans treated plant leaves. However, the increase of PR proteins by P. syringae pv. lachrymans infection was alleviated in HB-22 treated plant. The PR proteins levels were much higher in control plant than in HB-22 treated plant, although control plants had severer damage after pathogen infection. Therefore, increases of PR proteins activities do not seem to be a close relationship with plant protection after pathogen infection. It seems to be more relative to plant response or disease severity in this study.

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