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Articles by B.D. Gossen
Total Records ( 3 ) for B.D. Gossen
  S.F. Hwang , H.U. Ahmed , B.D. Gossen , H.R. Kutcher , S.A. Brandt , S.E. Strelkov , K.F. Chang and G.D. Turnbull
  Impact of long-term crop rotations on populations of soilborne pathogens in the genera Fusarium, Pythium and Rhizoctonia and on canola seedling establishment and development was evaluated under controlled conditions. Soil samples were collected from two crop rotation experiments conducted at two sites in Saskatchewan, Canada. A part of the 2006-soil sample of each rotation was sterilized to compare canola seedling growth with and without soilborne pathogens. With 2007-soil, the sterilization treatment was replaced with a fungicide seed treatment (Apron Maxx) to assess the potential to reduce seedling diseases. Populations of Fusarium, Pythium and Rhizoctonia sp. were estimated in the soil of each rotation using dilution plating onto selective media for each fungus. Higher seedling emergence and increased growth of canola were obtained in the sterilized soil or due to seed treatment. Fusarium was the predominant genus followed by Pythium and Rhizoctonia sp. in the soil of both sites. This study suggests that diverse crop in the rotation may reduce the populations of Fusarium, Pythium and Rhizoctonia in the soil and may contribute to improve the overall growth of canola.
  W.J. Li , J. Feng , K.F. Chang , R.L. Conner , S.F. Hwang , S.E. Strelkov , B.D. Gossen and D.L. McLaren
  To identify Quantitative Trait Loci (QTL) controlling root rot resistance of field pea (Pisum sativum L.), 213 Simple Sequence Repeats (SSR) were screened against a population of Recombinant Inbred Lines (RIL) derived from crosses between a moderately resistant cultivar Carman and a susceptible cultivar Reward. Phenotypic data were obtained following inoculation of pea plants with Fusarium avenaceum (Corda ex Fries) Sacc. in field experiments conducted during 2009 and 2010. Linkage analysis based on a single factor ANOVA indicated that four markers were associated with root rot resistance. QTL analysis based on these four markers identified a QTL on Chromosome VII that explained 21.7% of the variance in resistance. The microsatellite markers that are closely linked to this QTL may be useful for stacking QTLs from Carman and other resistance sources to develop cultivars with superior fusarium root rot resistance.
  H.U. Ahmed , S.F. Hwang , G.D. Turnbull , S.E. Strelkov and B.D. Gossen
  Seedling blight caused by Rhizoctonia solani Kühn substantially reduces stand establishment and seed yield of canola (Brassica napus L.) in western Canada. The effect of crop residue on soil populations of R. solani and canola seedling blight was examined under field, greenhouse and laboratory conditions. Field plots were established with inoculation or noninoculation with R. solani as the main plot and barley, canola, oat and field pea residues as the sub-plots. Soil samples were collected from each subplot for analysis in a greenhouse bioassay and laboratory assay of R. solani population before seeding canola. The crop residue effect was not significant. Under inoculation with R. solani, the yield was consistently greater when canola was grown on barley residue compared to the canola residue over two-year trials, although oat and pea residue contributed to greater yield. Without inoculation, canola yield was greatest when grown on barley residue, intermediate on oat and pea and the least on canola in the first trial and in the second trial greater yield was obtained on barley and oat residues compared to other residues. In the greenhouse bioassay, canola seedling emergence was greater, while damping off and root rot were less severe, following barley or oat compared to canola or field pea in both inoculated and non-inoculated treatments. Populations of Rhizoctonia were lower following barley or oat relative to canola or field pea. Crop rotation and incorporation of barley or oat residue between canola crops may be a useful strategy to reduce seedling blight of canola.
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