Dissertation > Excellent graduate degree dissertation topics show

The Chemical Control of Wheat Take-All and the Dsrna Virus in Gaeumannomyces Graminis Var. Tritici

Author: ZhangGuangLiang
Tutor: YuHanShou;ChenHuaiGu
School: Nanjing Agricultural College
Course: Biological Engineering
Keywords: Gaeumammomyces graminis var. tritici fungicide resistance monitoring dsRNA
CLC: S435.121.4
Type: Master's thesis
Year: 2013
Downloads: 3
Quote: 0
Read: Download Dissertation

Abstract


Take-all is an important wheat disease in Huang-Huai wheat production regions of China. To screen fungicides to control wheat take-all, inhibition activity of8fungicides against Gaeumannmyces graminis var. tritici was tested. The results showed that the activity of mycelial growth inhibition of the8fungicides was as follows:prochloraz> difenoconazole>tebuconazole>myclobutanil>kresoxim-methyl>thifluzamide> fenoxanil>fludioxonil.The joint-toxicity of the mixure of difenoconazole and prochloraz, and difenoconazole and tebuconazole, against G. graminis var. tritici were tested. The results showed that the toxicity coefficient of all mixtures was within80-120, which mean that there are additive effect. The co-toxicity coefficient was112when difenoconazole and prochloraz were mixed at4:1, and it was111when difenoconazole and tebuconazole were mixed at1:1.The indoor pot experiments showed that the seed treatments by triadimefon and tebuconazole both had a good control efficiency of G. graminis var. tritici. However, the seed treatments by propiconazole had poorer performance. The fungicide spraying at the beg almost had no control efficiency (less than15%).Inhibition activity of difenoconazole aganinst92isolates of G. graminis var. tritici from different regions in Shandong, Jiangsu, Henan province was tested. The results showed that the EC50values of92isolates ranged from0.0485to0.5973μg/mL. No isolate insensitive to difenoconazole was detected, and the sensitivity frequency was distributed as unimodal curves, these values could be adopted as the sensitivity baseline for resistance monitoring. Twenty-two isolates of G. graminis var. tritici were random selected to test their virulence. The results showed that the virulence was different significantly among the isolates, and the virulence was not related to the hypha growth rate. The dsRNA in these G. graminis var. tritici isolated, and no dsRNA was detected from only five isolates. The virulence of some isolates was weak regardless of the dsRNA presence or absence. It suggested that the presence or absence of dsRNA had no obvious correlation with the virulence of isolates. The part of an RdRp gene was obtained and its amino acid sequence was highly homology to many plant endogenous viruses.

Related Dissertations

  1. Incidence and Mechanisms of Insecticide Resistances to Organophosphates and Carbamates in Colorado Potato Beetle, Leptinotarsa Decemlineata (Say),S435.32
  2. Study on Roles of Diacylglycerol Kinase Gene Family in Rice under Xylanase and NaCl Treatments by Transient RNA Interference System,S511
  3. Resistance Monitoring in Field Populations of Bemisia Tabaci and Genomic Structure Analysis of Btgluclαl,S433
  4. Synthesis of Trifloxystrobin, a Highly Effective and Safe Fungicide,TQ455.4
  5. Study on Double Stranded RNA Viruses Infecting Radish,S436.31
  6. Study on the Synthesis and Process of Penthiopyrad,TQ455.4
  7. Study on Resistance Monitoring and Its Resistance to Beta-cypermethrin in Spiraling Whitefly,S433.3
  8. Study on Distinctions of Pesticides Resistance and Its Physiology Biochemistry in Different Populations of Pomacea Canaliculata,S433
  9. Sample Pretreatment and Chromatographic Analysis in Determination of Fungicides Residues in Food,TS207
  10. The Pathogen of the Alfalfa Leaf Spot in Gansu Province,S435.4
  11. The Reseach of Controlling Aphis Gossipy by Transgenic Technology,S188
  12. Studied on Pathogen of Onion Fusarium Basale Plate Rot and Chemical Control in Jiayuguan,S436.33
  13. Study of Pathogenic and Chemical Control of Barley Leaf Stripe,S435.123
  14. Biological Characteristics of Fusarium Moniliforme and Resistance Identification of Cultivars to Rice Bakanae Disease,S435.111.4
  15. Study on Broad Bean Root Rot in the Cold and Humid Regions of Gansu Province, China,S436.43
  16. New high bactericidal activity of lead compounds Yzk-C-22 Mechanism Study,S482.2
  17. Studies on Monitoring and Mechanism to Chlorpyrifos of Insecticide Resistance of Myzus Persicae,S433
  18. Development of New Strobilurin Fungicides,S482.2
  19. Studies on Synthesis and Antifungalactivities of Analogues Based on Kakuol (Ⅰ),TQ455
  20. Research on Identification of Pathogen Causing Potato Dry Rot and Disease Management,S435.32
  21. Study on Occurrence and Protection Technology of Main Diseases of Single Rice Cropping Along Huaihe River,S435.111.46

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