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Articles by A.N. Poddar
Total Records ( 4 ) for A.N. Poddar
  P. Chandra , R. Sao , S.K. Gautam and A.N. Poddar
  Root knot nematodes are responsible for tremendous amount of crop loss in Cucurbits. Hence, pot culture experiments were conducted under greenhouse conditions to study the effect of population density on the pathogenic potential of M. incognita in Lageneria ciceraria, Cucumis sativa, Momordica charantia and Cucurbita pepo. The 10, 100 and 1000 second stage juveniles (L2) were inoculated into the rhizosphere of 15 day old seedlings and percent changes in the growth parameters of infected plants vis-avis control recorded manually, after 30 and 60 days along with the number of root galls and final nematode population extracted from roots and soil. Estimation of RGS and rate of reproduction was calculated by standard methods from the data obtained. Statistical significance of the means was analyzed by ANOVA using Ms Office Excel. All the four cucurbits were found to be highly or moderately susceptible to infection with M. incognita and population growth of the nematode was found to be a determining factor in the pathogenesis of the infection. A general response was a disturbance in the plant growth pattern due to limitation in water and nutrient translocation from infected roots to above-ground plant tissues. An inverse relationship was found to exist between population density, population growth and severity of root galls. The on set of galls has been considered to be a protective measure of the plant for restriction of parasitic movement and maintenance of stable parasite population. The root knot nematodes have been considered to use both r and k strategies for their efficient survival and perpetuation of species depending on inter and intra-specific competition prevailing.
  A. Mishra and A.N. Poddar
  The Bhilai Steel Plant is an integrated steel plant situated 30 kilometers (west) of Raipur, the capital of the state of Chhattisgarh (India). The waste generated in the coke ovens has a strong phenolic odour and contains a high amount of phenol, besides the presence of other toxic substances. A preliminary survey was conducted in five localities of the coke oven effluent channel, also known as Purena nala and gross effluent characteristics observed along with associated aquatic animals and plants growing in the embankment of the channel. Besides this, the LC50 of the waste water was also observed on the fresh water fish, Channa punctatus Bloch, for 24 to 96 h (short term exposure) and one month (long term exposure) using bioassay method. Percent mortalities of the fishes were also observed during short and long term exposures to lower and higher concentrations. The concentration of the effluent and duration of exposure were observed to have significant effects on organisms. Besides, some necrotic spots, lesions along with tail rotting were also observed.
  P.C. Xalxo , D. Karkun and A.N. Poddar
  The root knot nematode (Meloidogyne spp.) is a polyphagous plant pest causing losses in a wide range of host crops. Due to environmental health concerns, the search for new microbial strains as nematode control agents is relevant. Soil samples were collected from the rhizoshere of nematode infested and non infested cucurbits plants and fungi isolated and identified using standard methods. Extraction of nematodes was done using Cobb’s sieving and decanting method and modified Baerman’s funnel technique. Cell free Fungal Culture Filtrates (FCF) were prepared from the most frequently occurring isolates and their nematicidal potentials assessed as the mean percentage mortality of nematodes at an interval of 24, 48 and 72 h. Sterile distilled water served as control. In all 18 fungal species were isolated from the rhizosphere soil of Momordica charantia control and 08 species from that of Momordica charantia infected and 09 species from Lagenaria siceraria infected. Among the nine fungi tested for nematicidal properties, Aspergillus flavus showed maximum nematode mortality (45%) after 24 h. After 48 h maximum nematode mortality was shown by Aspergillus species 2 and Trichoderma viride (68.75%). After 72 h, maximum nematode mortality was observed due to Trichoderma viride and Aspergillus flavus (93.75%). The results suggest that the various fungi associated with the rhizosphere soil of different vegetable crops could be used as a biocontrol agent of nematodes and the culture filtrates can serve as a source of novel nematicidal compound of fungal origin which is more environmental friendly.
  R. Sahu , P. Chandra and A.N. Poddar
  Community analysis of plant nematodes is an important criterion for assessment of their pathogenic potential in a particular region and identification of hotspots of nematode attack. This investigation involves a study of the community structure of phytonematodes associated with the vegetable crops in the district Durg of Chhattisgarh. Collection of soil and root samples was done during mid cropping season from the rhizosphere of vegetable crops. Extraction of the nematodes was done by Cobb’s sieving and decanting method, followed by modified Baermann’s funnel technique. Species were identified on the basis of perineal patterns of females. The estimation of nematode population was done in a multichambered counting dish under a stereoscopic binocular microscope. The predominant nematode species were Meloidogyne incognita, M. javanica and Meloidogyne spp. associated with Tomato, Egg plant, Cowpea and Bottle gourd. Others were Rotylenchulus reniformis, Tylenchorhynchus indicus, Pratylenchus spp. Helicotylenchus spp. and Tylenchidae. The highest absolute density was of M. incognita and Meloidogyne spp. followed by M. javanica, M. arenaria and R. reniformis while, Helicotylenchus spp. and Tylenchidae had the lowest density. T. indicus, R. reniformis and M. javanica were most frequent while, Meloidogyne spp. Helicotylenchus spp. and Tylenchidae were the least frequent. Highest prominence value was recorded for M. javanica, followed by M. incognita, Meloidogyne spp. R. reniformis and M. arenaria. Pratylenchus spp. Helicotylenchus spp. and Tylenchidae were the least prominent nematodes. This is the first record of various species of phytonematodes associated with vegetable crops in this tribal state.
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