Pseudomonas marginalis pv. marginalis and some other bacteria on faba bean
1997
Vassilev, V.I. (K. Malkoff Inst. for Plant Genetic Resources, Sadovo Plovdiv (Bulgaria))
Bulgarian elite faba bean (Vicia faba L.) seeds showed bacterial infection rates of up to 21 percent during the period 1985-1996. Some seed lots had 60-80 percent infection rates and were, therefore, discarded. Nine faba bean cultivars from among the collection in our gene bank were selected for the present study. Seeds from these lines and cultivars were grown in a glasshouse and in the field. Samples from different parts of naturally infected plants and seeds of faba bean were collected between 1985 and 1996. Germination of seeds and symptom appearance from naturally and artificially infected seeds and plants were tested in the laboratory. Pure cultures of bacteria were isolated from diseased and visually healthy plants and seeds. Determining which bacterial species were involved in pathogenesis on faba bean was done only when Koch's postulates were fulfilled. The most widespread bacterial pathogen in the faba bean seeds and plants was identified as Pseudomonas marginalis (Brown) Stevens pv. marginalis. Bacteria belonging to Bacillus, Erwinia, and Xanthomonas species were isolated. Recently (1991-96), Pseudomonas syringae was identified as a weak pathogen on stems and leaves. Symptoms on the different organs of V. faba and artificial inoculation suggested that Pseudomonas syringae was mainly an opportunistic pathogen damaging the crop in the years when conditions for plant growth were unfavorable and when poor agronomic measures were applied
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