Pathogenic variability within applicable groups of inducers and salts to resist potato from soft rot bacteria Pectobacterium carotovorum invitro [electronic resource].

Includes references.

Thirty six Pectobacterium carotovorum isolates, recovered from soft rot symptoms on potato tubers in Egypt were characterized taxonomically and assessed in a tuber test for differences in ability to cause tuber rotting on "Diamont" cultivar considered to be very susceptible to soft rot. This study aimed to management of the disease using salicylic acid, acetyl salicylic acid, oxalic acid, phloroglucinol and BION as resistance inducing factors, as well as, potassium sulfate, ammonium phosphate and calcium chloride as salt compounds n vitro. All tested chemicals at concentration 0.5 g/l, significantly, reduced soft rot development in wounded entire potato tubers cvs. "Nicola, Ladypalfor and Rosetta" compared with control. Such reduction in disease development by tested treatments was significantly decreased with increasing storage days. The obtained results proved that salicylic acid was more effective comparing with all tested resistance inducing factors in reduction of soft rot. In case of tested salt compounds, results exhibited that potassium sulfate was superior to all of their in reduction of the disease. Generally, resistance induced in potato tubers by tested chemicals varied upon tested potato cultivars. Potato tuber cv. "Nicola" showed the highest reduction in soft rot disease index followed by cv. "Rosetta" and finally cv. "Ladypalfor".

Summary in Arabic.

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