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Articles by P. Ponmurugan
Total Records ( 9 ) for P. Ponmurugan
  V. Thangapandian , P. Ponmurugan and K. Ponmurugan
  A study was undertaken to isolate actinomycetes from the soils which collected from Kolli Hills located at Salem District, Tamilnadu, India. The isolated actinomycetes were subjected to identify at the genus level and induce to produce bioactive secondary metabolites under in vitro condition. There were eight isolates obtained from different region of Kolli hills and studied for the detection of antimicrobial substances contained for it. These antimicrobial compounds were extracted and tested against some microorganisms like Streptococcus faecalis, Pseudomonas aeruginosa, Escherichia coli, Bacillus amyloliquefaciens, Staphylococcus aureus, Candida albicans and Cryptococcus neoformans. The results showed that out of eight, five isolates were found to be of potential antagonists against pathogens and thus proving the production of secondary metabolites, which has the potential to control a variety of pathogenic organisms.
  P. Ponmurugan and B. Nithya
  Soil samples were collected from different states in Southern India to isolate and characterize actinomycetes at molecular levels through plasmid DNA and protein pattern. A total of 12 soil samples were collected from which four strains (AP-1, KN-2, KL-3 and TN-4) were isolated and characterized as Streptomyces sannanensis. The antimicrobial activity of these strains was studied against gram-negative and positive-bacteria. It was capable of producing antibiotic against gram-positive, while gram-negative bacteria were not affected. The potential of antibiotic production of these strains is likely to be chromosomally encoded by confirming the detection of plasmid DNA. The strains such as KN-2 and KL-3 showed two plasmids and the other two strains showed only one. This is a preliminary step to correlate the chemotaxonomic relationship among the strains of Streptomyces spp. for secondary metabolite production.
  A. Maripandi , Suresh S.S. Raja , P. Ponmurugan and G. Gurusubramanian
  An attempt was made to study RAPD using 30 isolates of S. enteritidis obtained from chicken samples for the purpose of strain discrimination. The primer used was P1254, (5’CCGCAGCCAA3’) to amplify the genomic fragment of S. enteritidis isolates, which resulted in production of six clones. Six isolates each in clone 1, 2 and 5 and another four isolates each in clone 2, 4 and 6, respectively. In clone 1, having an additional 900 bp amplified products but it was lacking in clones 2 and shared a common 500 bp fragments. Clone 3 had additional amplified fragment at 450 bp. It was lacking in clone 4 and clone 5 had the additional amplified products at 950, 900, 750 and 560 bp but it was lacking in clone 6. The final cluster 6 had three fragments with molecular weight 1550, 1300 and 400 bp, respectively. To sum up, there were 6 distinct clones of S. enteritidis serovars identified based on RAPD profiling.
  S. Anita and P. Ponmurugan
  An attempt was made to study the biocontrol activity of Trichoderma atroviride against Phomopsis theae Petch, a causative agent of Phomopsis canker disease in tea plants. Among 78 isolates enumerated, six strains, each representing an agroclimatic zone was chosen for further studies and later it was identified it as Trichoderma atroviride. A range of in vitro assessment such as growth parameters, antagonist activity against P. theae and compatibility with fungicides were evaluated for selected T. atroviride isolates. The correlation of various edaphic and environmental factors with population density of Trichoderma spp. showed positive results. The radial growth measurement and mycelium dry weight of Tv1 isolate obtained from Valparai showed the utmost growth on Potato Dextrose Agar. The highest antagonist activity of 65.77, 91.25 and 69.17% was observed for Tv1 isolates in dual culture test, antibiosis for volatile and non-volatile antifungal compounds. The compatibility of T. atroviride isolates tested against various contact and systematic fungicides clearly showed that Tv1 isolate can able to tolerate the concentration to higher extent. Hence the results revealed that Tv1 isolates proved to be eminent strains in controlling Phomopsis canker disease in tea plants.
  B. Bagyalakshmi , A. Balamurugan , P. Ponmurugan and R. Premkumar
  An in vitro study was undertaken to evaluate the compatibility of indigenous plant growth promoting rhizobacteria (PGPR) with commonly used inorganic and organic sources of fertilizers in tea plantations. The nitrogenous, phosphatic and potash fertilizers used for this study were urea, rock phosphate and muriate of potash, respectively. The organic sources of fertilizers neem cake, composted coir pith and vermicompost were also used. PGPRs such as nitrogen fixer; Azospirillum lipoferum, Phosphate Solubilizing Bacteria (PSB); Pseudomonas putida, Potassium Solubilizing Bacteria (KSB); Burkholderia cepacia and Pseudomonas putida were used for compatibility study. Results were indicated that PGPRs preferred the coir pith and they proved their higher colony establishment in the formulation except Azospirillum spp. that preferred vermicompost for their establishment. The optimum dose of neem cake powder supported the PGPR incidence when compared to lower and higher doses. As the concentration of rock phosphate increased, the population of PGPR was also increased whereas medium dose of MOP supported their growth and in the case of urea even at lower dose totally retarded the growth of bioinoculants. This study would give a prior knowledge on PGPR sensitivity with synthetic and organic manures in order to suggest the field recommendation on combined application of organic/inorganic/biofertilizers for improving the tea yield and also to protect soil health under integrated nutrient management approach.
  B. Nithya and P. Ponmurugan
  A study was undertaken to isolate biologically diverse strains of actinomycetes from medicinal plants rhizosphere soil collected from different locations of Yercaud hills belonging to Eastern Ghats of southern India for the production of bioactive secondary metabolites. The results indicated that a total of 20 strains were obtained from soil samples and further correlated with soil nutrients status in which five novel strains were screened for further investigation based on in vitro performance. The bioactive antimicrobial compounds were extracted from the purified cultures and tested their efficacy against some human pathogenic microorganisms such as Staphylococcus aureus, Escherichia coli, Bacillus amyloliquefaciens, Serratia marcescens and Pseudomonas fluorescence and beneficial microorganisms such as Phosphobacteria (PSB), Potassium solubilizing bacteria (KSB), Azospirillum and Rhizobium spp. including tea plant pathogens namely Phomopsis theae and Tunstallia aculeate. The results showed that all the strains were found to be of potential antagonists against the tested pathogens and thus providing the production of secondary metabolites.
  P. Ponmurugan
  Proteolysis reactions are taking place due to the degradation of proteins into amino acids or peptides by a variety of microorganisms. An investigation was taken up to find out the activity of proteolysis by Bacillus species under controlled condition. Attempts were made to isolate Bacillus species from three samples such as water, egg granules and flavour juice. The microbial load was found to be more in water samples followed by egg granules and it was least in flavour juice samples. A total of seven isolates were obtained from these samples and were designated as WB-1, WB-2, EB-1, EB-2, JMB, JLB and JGB. The isolated bacteria were characterized based on their morphological, culture characteristics and biochemical tests. Further, the results were compared with the Bergey`s manual of Determinative Bacteriology, which showed Bacillus cereus. The activity of proteolysis was studied by using two different media such as albumin agar and skim milk agar. The results revealed that skim milk agar medium was found to be higher in term of the formation of halo zone around colonies than albumin agar medium. The formation of halo zone around colonies in the media indicated that proteins were hydrolyzed by the bacteria. Among the different strains tested for the activity, WB-2 was found to the best followed by WB-1 and least by JGB in both media.
  P. Ponmurugan , Y. Nataraja Sekhar and T.R. Sreesakthi
  The effect of different biowastes such as paddy straw, sorghum straw, sugarcane molasses, saw dust and paper waste on the growth and biochemical constituents of oyster mushroom (Pleurotus florida) was studied. Favourable conditions were created to attain the maximum yield of mushrooms. The results reveled that mushroom growth was better in paddy straw followed by sugarcane molasses and least in wood saw dust and paper waste. The growth of mushrooms may be coincided with type of substrates used that leads to tremendous utilization of nutrients in the biowastes. The results further indicated that the biometric parameters such as fresh weight, dry weight and dry matter accumulation and biochemical constituents such as total sugars, protein, amino acids and lipids were also found to be higher in mushrooms grown in paddy straw followed by sugarcane molasses and least in wood saw dust and paper waste. The microelements such as phosphorous, potassium calcium and magnesium were also found to be higher in mushrooms grown in paddy straw when compared to the other substrates.
  P. Ponmurugan and U.I. Baby
  An experiment was conducted under greenhouse condition to study the morphological, physiological and biochemical changes in tea plants due to Phomopsis infection. Physiological responses of tea plants to infection in term of photosynthetic rate, transpiration rate, stomatal conductance, water use efficiency and total chlorophyll content were studied in susceptible TRI-2024 and tolerant TRI-2025 cultivars. In addition, growth characteristics such as height, dry weight and plant strength and biochemical parameters such as total sugar, nitrogen, amino acids, protein, polyphenols and catechins of infected and healthy plants were also studied. The results revealed that all the growth characteristics, physiological and biochemical parameters were reduced significantly in infected plants rather than healthy plants. However, the reduction was more prominent in susceptible cultivar than in tolerant ones. Clonal susceptibility of a few tea cultivars was tested by inoculating the pathogen onto susceptible and tolerant clones. A clear variation in the size of the canker was noticed in the susceptible TRI-2024 and tolerant TRI-2025 cultivars.
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