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Articles by A. Vikram
Total Records ( 4 ) for A. Vikram
  A. Vikram , H. Hamzehzarghani , K.I. Al-Mughrabi , P.U. Krishnaraj and K.S. Jagadeesh
  In this study the ability of Pseudomonas fluorescens FPD-15 to promote plant growth was assessed under greenhouse conditions using JL-24 variety of peanut as a test crop. A pot experiment was carried out in completely randomized factorial design with two main factors to investigate the effect of application of Pseudomonas fluorescens FPD-15 with Bradyrhizobium strains NC-92 and SSP-24 under preincubated and coinoculated conditions (as a main factor with seven levels) at different time intervals (as the second main factor with three levels) with 3 replicates. Analysis of Variance (ANOVA) on each measured response variable (comprising root and shoot biomass, nodule number and dry weight and nitrogen content) was performed using the GLM procedure of SAS. The inoculation of peanut seeds with FPD-15 significantly increased root and shoot dry weight, nodule number and dry weight and N content in shoot when compared to the control. The interaction between FPD-15 and Bradyrhizobium strains NC-92 and SSP-24 were studied under preincubated and coinoculated conditions. The preincubated treatments yielded significantly higher root and shoot dry weight, nodule number, nodule dry weight and percent N content of shoot compared to the coinoculated treatments. Field trials using these strains should be conducted before they can be exploited in a commercial set up.
  A. Vikram , H. Hamzehzarghani , A.R. Alagawadi , P.U. Krishnaraj and B.S. Chandrashekar
  Phosphate Solubilizing Bacteria (PSB) isolated from the crops grown in vertisols were tested for the production of Plant Growth Promoting Substances (PGPS) such as Indole Acetic Acid (IAA), Gibberellic Acid (GA) and organic acids. All the 30 isolates of PSB were able to produce both IAA and GA and the amount ranged from 1.1 to 28.0 µg/25 and from 0.6 µg to 9.8 µg/25 mL of broth, respectively. The strains PSBV-4 and PSBV-5 produced the maximum amounts of IAA and GA, respectively. The organic acids produced were gluconic acid, tartaric acid, citric acid, maleic acid, succinic acid, glyoxalic acid and a few unidentified acids. The strain PSBV-9 and the standard Pseudomonas striata produced six organic acids while strains PSBV-10, PSBV-25 and PSBV-16 produced only five organic acids. Hierarchical cluster analysis was used to separate PSBs according to IAA and GA production and the PSBs were classified into three major groups. Correspondence analysis was used to find any association between PSB isolates and organic acid production and it showed a significant association between organic acid production and PSB isolates. The PSB strains isolated here have the potential to promote plant growth, as demonstrated here based on the production of PGPS and organic acids. However, their ability to promote plant growth under greenhouse and field conditions has to be validated.
  K.I. Al-Mughrabi , C. Bertheleme , T. Livingston , A. Burgoyne , R. Poirier and A. Vikram
  A field experiment was conducted in Woodstock, New Brunswick, Canada to study the efficacy of compost tea and compost on reduction of tuber diseases in potato. A randomized complete block design replicated four times was established in a commercial field setting with four treatments (control, compost, compost tea and compost + compost tea). Tubers were assessed for disease severity, tuber number, tuber weight, defects and total yield. Treatment of potato plants with compost, compost tea or a combination of compost + compost tea significantly reduced the severity of common scab tuber disease by 81, 42 and 81%, respectively, compared to the untreated control. Treatments were ineffective against the potato tuber diseases fusarium dry rot, black scurf and silver scurf. Potato plants treated with compost tea and a combination of compost + compost tea produced higher yield compared to all other treatments. However, the number and weight of knobby tubers were significantly higher in compost tea treatment and significantly lower in the combined treatment of both compost + compost tea compared to other treatments. This is the first study to report on the effect of compost and compost tea against common scab of potatoes.
  A. Vikram and H. Hamzehzarghani
  Phosphorus is one of important macronutrients and plays an important role in metabolism of crop plants. In vertisols the availability of P is limited due to the problem of P fixation. Phosphate solubilizing microorganisms have the capability to solubilize P and make it available for plant uptake. In the present study ability of 16 isolates of Phosphate Solubilizing Bacteria (PSB) to promote growth parameters in greengram crop was tested under greenhouse conditions. The study consisted of 18 treatments which were replicated three times. Inoculation of greengram seeds with PSBV-14 recorded the highest nodule number, nodule dry weight, shoot dry matter and total dry matter in greengram plants 45 days after sowing. Similarly, treatment receiving the inoculation of PSBV-13 recorded the highest root length, root dry matter, P content and P uptake in root and shoot in greengram plants. Majority of PSB isolates tested in the present study were able to improve the growth parameters of greengram significantly compared to rock phosphate control and single super phosphate control. Among the various PSB isolates tested, PSBV-4, PSBV-9, PSBV-12, PSBV-13, PSBV-14 and PSBV-15 fared considerably better than the remaining ones. The highly efficient PSBs from the pot trial could be tested for their efficacy in field conditions before recommending them for commercial exploitation.
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