Dissertation > Excellent graduate degree dissertation topics show

Study on Pathogen of Small Leaf Spot Disease and the Harm of Leaf Spot Disease on Maize in Ya’an

Author: LiuLu
Tutor: GongGuoShu
School: Sichuan Agricultural University
Course: Plant Pathology
Keywords: Maize Disease survey Pathogenic classification Bipolaris spp
CLC: S435.131.49
Type: Master's thesis
Year: 2012
Downloads: 17
Quote: 0
Read: Download Dissertation


During2010and2011, leaf blight diseases were investigated on maize in Ya’ an. The survey shows that there were some small leaf spot diseases caused by several fungi besides northern corn leaf blight(Exserohilum turcicum) and gray spot disease (Cercospora zeae-maydis) in Ya’ an. In2010, northern corn leaf blight was mild occurrence, whereas small leaf spot and gray spot disease were vere serious in Baoxing. In2011, small leaf spot and gray spot diseases were slighter than2010after treatments, especially in Lushan and Baoxing.The relationship between elevation and northern corn leaf blight is not obvious, however there were a positive correlations of between elevation and occurrences of small spot leaf and gray spot disease, especially gray spot disease. It showed that higher elevation correspond to heavier condition.22species of fungi were identificated from corn leaf by4methods, which are moisturizing observation, microscopic examination, tissue separation and tissue separation without sterile. They included Fusarium, Bipolaris spp, and so on,29isolates were obtained from small leaf spot and identificated. By comparing colony morphology, colony growth rate, spore morphology, spore germination, shape of spot, the results showed that the dominant isolates had slow growth rate, straight spore, two ends of germination, and caused the small strip spot, the strains could be divided into3categories by rDNA-ITS and elongation factor sequences detection. The first kind of strains is Bipolaris maydis which was dominant group causing southern corn leaf blight. The second kind of strains was Bipolaris sorokiniana. The third kind of strains was Bipolaris zeicola which could cause small stripe type leaf spot disease.

Related Dissertations

  1. Effect of Planting Densities and Modes on Lodging Resistance of Stem in Summer Maize,S513
  2. The Effects of Abaand H2O2 on sHSPs and Antioxident Defense Enzymes Induced by the Combination of Drought and Heat Stress in Maize,S513
  3. Studies on Senescence Difference in Roots and Leaves in Two Varieties of Maize and Their Regulator,S513
  4. Optimization Design Andapplication of Extracting Methods of Maize (Zea Mays L.) Volatile Compounds,S513
  5. The Difference of Proteome Expression of Low Light Stress and Regular Light Recovery on Growth of Maize Seedling,S513
  6. Effect of Nitrogenapplication Patterns on Variation of Soil Nitrate-N and Grain Yield of Wheat and Maize,S512.11
  7. Primary Study of Inheritance on Lodging Resistance Traits in Maize,S513
  8. Characterization of Mineral Phosphate-Solubilizing Bacterium K3 and Colonization under Different Soil,S144.9
  9. Difference Analysis of Growth and Photosynthetic Characteristics in Six Maize Lines and Hybrids Via a Diallel Design,S513
  10. Monitoring Nitrogen Status and Growth Characters with Canopy Spectral Reflectance in Summer Maize,S513
  11. Fine Mapping of Two Leaf Mutant Genes al and yl in Maize,S513
  12. The Study of Adding Wet Brewer’s Grains on Fermentation Quality of Mixed Ensilages of Corn Stalk and Agricultural Byproducts,S816.53
  13. Establishment of Transgenic Soybean, Maize and Wheat Informationg Platform and Effect of Transgenic Soybean on Soil Microorganisms,S565.1
  14. Effect of γ-amino Butyric Acid on the Growth and Development of Crop Seedlings,S482.8
  15. QTL Analysis of Grain Filling Rate and Associated Traits in Maize,S513
  16. Studies on Plant Growth Regulators Relieving the Injury of Azoxystrobin to Maize and Soybean Seedling,S481
  17. Studies on Differences of Nitrogen, Phosphorus and Potassium Uptake and Utilization Among Different Genotypes Maize,S513
  18. Genotypic Variation for Root Morpha and Potassium Accumulation in Maize Inbred Lines under Potassium Stress Condition,S513
  19. Introduction of Transgenic Plants Via Non-Tissue-Culture Methods,Q943.2
  20. Increased Cd and Cu Accumulation and Heavy Metal-tolerance of Plants by ACC-deaminase Producing Bacteria and the Mechanisms,X172
  21. Theoretical Analysis and Experiment Study on Maize Pair Seeds Thresher,S226.1

CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Crop pests and diseases and their prevention > Cereal crop pests and diseases > Corn pests and diseases > Maize Disease > Transgression ( pass ) an infectious agent harmful > Other the corn infectious disease
© 2012 www.DissertationTopic.Net  Mobile