Author: Kazi Abdul KaderPublisher:
ISBN:
Category :
Languages : en
Pages : 104
Book Description
Fitness, Virulence and Genetic Variability in Pyrenophora Tritici-repentis Isolates Causing Tan Spot of Wheat in Oklahoma
Author: Kazi Abdul KaderMolecular Polymorphism and Virulence in Pyrenophora Tritici-repentis
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Tan spot is a major leaf-spotting disease of wheat, found in all the major wheat growing areas of the world. Isolates of 'Pyrenophora tritici-repentis ', the causal fungus of this disease, are currently grouped into six races based on their ability to induce necrosis and chlorosis on a set of differential wheat cultivars/lines. The genetic variability of the pathogen and relationships among the six currently known races of 'P. tritici-repentis ' were investigated using RAPD analysis. A collection of fifty-three isolates from hexaploid and tetraploid wheats originating from Manitoba, Saskatchewan, Alberta, North Dakota, Uruguay and Algeria was used in this study. The results of this study strongly suggested that virulence is the major driving force in the variation and evolution of 'P. tritici-repentis'. (Abstract shortened by UMI.).
Molecular Polymorphism and Virulence in Pyrenophora Tritici-repentis
Author: Genetic Studies on the Resistance to Tan Spot of Wheat and Genetic Similarity Among Isolates of [i]Pyrenophora Tritici-repentis[/i].
![Genetic Studies on the Resistance to Tan Spot of Wheat and Genetic Similarity Among Isolates of [i]Pyrenophora Tritici-repentis[/i]. PDF](https://books.google.com/books/content/images/frontcover/kfxcAQAACAAJ?fife=w80-h100)
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Tan spot of wheat, caused by the fungus 'Pyrenophora tritici-repentis ' (Died.) Dreches., has become a major component of the leaf spot disease complex in the prairie region in recent years. On susceptible host cultivars 'P. tritici-repentis' induces two distinct symptoms, tan necrosis and extensive chlorosis. To date, five races of 'P. tritici-repentis ' have been identified based on their reaction on a set of wheat differential cultivars. The major objective of this study was to investigate the genetics of resistance to tan spot in several diverse hexaploid wheat cultivars to races 1, 2, and 3, and to the culture filtrate of 'P. tritici-repentis ', race 2. The F1 and F2 generations and F 2:3 and F2:8 families of crosses between the seven selected genotypes were tested with each race in growth room experiments. Two independently inherited genes controlled resistance to tan spot of wheat. A single dominant gene controls resistance to chlorosis induced by races 1 and 3, while a single recessive gene controlsresistance to necrosis induced by races 1 and 2. The same recessive gene controls resistance to necrosis induced by spore-inoculation or culture filtrate infiltration of 'P. tritici-repentis', race 2. This indicated that infiltration with the culture filtrate could replace spore-inoculation when testing for resistance to the necrosis component of tan spot. No segregation was observed in crosses among the resistant cultivars for both the necrosis and the chlorosis components, indicating that the resistant cultivars carried the same resistant genes. The second objective of this study was to assess the genetic similarity among different isolates of 'P. tritici-repentis' and to determine if this similarity is related to race classification or geographic origin of the isolates. Thirty-eight different isolates including other ' Pyrenophora' species were studied with 30 RAPD primers. Cluster analysis and AMOVA indicated that high genetic variability existed among the iso.
Infection Efficiency of Propagules of Pyrenophora Tritici- Repentis Isolates and Evaluation of Wheat for Reaction to Tan Spot
Author: Conrad Kent EvansGenetic Studies on the Resistance to Tan Spot of Wheat and Genetic Similarity Among Isolates of Pyrenophora Tritici-repentis
Author: Tan Spot of Wheat and Related Diseases Workshop, July 14-15, 1981, North Dakota State University, Fargo, North Dakota
Author: Robert M. HosfordPublisher:
ISBN:
Category : Leaf rust of wheat
Languages : en
Pages : 128
Book Description
Author: Lakhdar Lamari
Author: Daniel A. Brown
Author: Hamza Habil Otondo