ISOLATION AND CHARACTERIZATION OF PAENIBACILLUS POLYMYXA BACTERIUM ASSOCIATED WITH SUGAR BEET ROTTED ROOTS

Sugar beet plants are attacked by several diseases. The most serious
diseases that causing post-harvest decay of sugar beet storage roots. Root rot
affect sugar beet yield and quality. Various fungi and bacteria are reacted as root
rotting incidents. Isolation trails resulted 8 infective bacterial isolates. Three
bacterial isolates (B5, B6, B10) were the most virulent as root rotting.
Morphological and biochemical properties of the most virulent bacterial isolates
showed that they are typically reacted as Paenibacillus polymyxa. In addition,
molecular identification of the most virulent isolate B5 confirmed it
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identification as P. polymyxa. The obtained isolate B5 was rotted potato tuber
slices. Response of sugar beet genotypes was various to P. polymyxa Infection.
Sugar beet genotype BTS185 reacted as the most susceptible, while genotype
Husam was the least susceptible to P. polymyxa infection. Furthermore, the
tested isolate of P. polymyxa was able to infect storage roots of turnip, carrot
and sweet potato beside garlic claves.