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Articles by M. Muthusamy
Total Records ( 2 ) for M. Muthusamy
  T. Saravanan , M. Muthusamy and T. Marimuthu
  A detailed study was conducted to find out the efficacy of Pseudomonas fluorescens on fusarium wilt pathogen in banana rhizosphere. All the strains of P. fluorescens isolated from banana rhizosphere had significant inhibitory action on the growth of Fusarium oxysporum f.sp. cubense. Among the strains, Pfm of P. fluorescens had higher inhibitory action while comparing with other strain. Talc formulation of Pfm of P. fluorescens was prepared and applied in three month old banana plants to study their efficacy on fusarium wilt disease. After three month of inoculation, Pfm of P. fluorescens inoculated at 10 and 15 g plant ha-1 showed lesser vascular discoloration index than the control. To study the rhizosphere colonizing ability in banana rhizosphere against fusarium wilt disease, a rifampicin resistant strain of Pfm of P. fluorescens was developed. The banana plants inoculated with a rifampicin resistant strain of Pfm of P. fluorescens showed gradual increase in population of P. fluorescens in the rhizosphere over the period of time upto 60 days after inoculation. The extracts of soil inoculated with rifampicin resistant strain of Pfm of P. fluorescens at 10 g plant ha-1 showed significant reduction in spore germination of F. oxysporum f.sp. cubense. Gradual increasing in the reduction of spore germination was observed in the soil extracts over the period of inoculation upto 60 days after inoculation. Similarly, the filter paper dipped in extracts of soil had higher inhibition of growth of F. oxysporum f.sp. cubense at 60 days after inoculation.
  T. Saravanan , R. Bhaskaran and M. Muthusamy
  Pseudomonas fluorescens isolated from banana rhizosphere reduced the vascular discolouration associated with Fusarium wilt disease and induced the accumulation of resistance associated enzymes in roots. The banana roots inoculated with talc based formulation of P. fluorescens at 10 g / plant had minimum vascular discolouration index when compared to pathogen Fusarium oxysporum f.sp. cubense alone inoculated roots. The resistance associated enzymes viz., peroxidase and polyphenol oxidase activity increased two folds on 8 days in roots treated with P. fluorescens and challenged with F. oxysporum f.sp. cubense. Whereas phenylalanine ammonia lyase activity increased two folds on 6 days, later shows decreasing trend in the roots. In F. oxysporum f.sp. cubense alone inoculated plants, peroxidase, polyphenol oxidase and phenylalanine ammonia lyase activities increased upto 4 days after inoculation. The induction was compared with other fungal biocontrol agent`s viz., Trichoderma viride and Trichoderma harzianum. Same trend of enzymes induction were noticed in T. viride and T. harzianum inoculated roots. Further more, in Native Poly Acrlyamide Gel Electrophoresis analysis, two isoforms of peroxidase and five isoforms of polyphenol oxidase were observed in roots treated with P. fluorescens and challenged with F. oxysporum f.sp. cubense.
 
 
 
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