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Articles by P. Chandra
Total Records ( 3 ) for P. Chandra
  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.
  R.N. Hegde , P. Chandra and S.T. Nandibewoor
  This study describes the excellent electro-catalytic activity towards voltammetric oxidation of atenolol at Multi-walled carbon nanotube (MWCNT)-modified glassy carbon electrode and its determination. Compared to bare glassy carbon electrode, the MWCNT-modified glassy carbon electrode exhibited an apparent shift of the oxidation potential to the less positive direction and a marked enhancement in the current response of atenolol. The electro-catalytic behavior was further exploited as a sensitive detection scheme for the atenolol determination by differential-pulse voltammeter. Under optimized conditions, the linear range and detection limit are 2.0x10-7 to 6.0x10-6 and 2.34x10-8 M, respectively for atenolol. The proposed method was successfully applied to atenolol determination in pharmaceutical samples and urine, without any preliminary treatment.
  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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