Abstract
The effects of thefluorescent pseudomonadisolate CW2 on hyphae ofPythium ultimum (Trow) andRhizoctoniasolani(Khn)and root colonization were studied in gnotobiotic systems under scanning electron microscopy (SEM). Results of SEM revealed that the frequency of bacterial colonization was higher in cucumber roots infested with the fungi than in healthy roots. Isolate CW2 caused irregular and abnormal fungal growth. Swellings and shrinkages ofP. ultimumand R. Solanihyphae were obvious when cucumber roots were drenched with CW2. SEM studies were also conducted to evaluate the effect of CW2 on hyphae of both fungi on PDA medium.The hyphae ofP. ultimumand R. solanishowed distinct morphological alterations and degradationcompared to untreated healthy control hyphae ofPythium orRhizoctoniawhich were slender and uniform in shape.The results provide direct evidence of bacterial attachment and colonization to f ungal hyphae of both tested spp.and show that fungal growth to be significantly reduced in the presence of isolate CW2.
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