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Population biology of Puccinia graminis

implications for the epidemiology and control of stem rust

Berlin, Anna (2012). Population biology of Puccinia graminis. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2012:79
ISBN 978-91-576-7726-6
[Doctoral thesis]

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Barberry has made a noticeable comeback in the agricultural landscape after the repeal in 1994 of a law requiring its eradication. It has brought with it not only biological diversity, but also stem rust caused by Puccinia graminis (Pers.). Rusts have been known and feared for centuries. This thesis presents the results of studies of the population structure of P. graminis and connects this information to the epidemiology of stem rust. The studies were done by using SSR (simple sequence repeat) markers on samples from different hosts, years and areas. The results show that P. graminis genetically is a very diverse pathogen and no correlation in population structure could be detected between fields or years. However, there was a clear genetic differentiation between the forma specialis infecting oats and the forma specialis infecting rye and wheat. The aecial morphology also differed between the two, and the differentiation was reflected in a phylogenetic study. It was thus shown that P. graminis could be divided into two phylogenetically distinct species. The grass host is the driving force in the evolution of these species. In addition, Puccinia arrhenatheri was identified from barberry and its grass host.

The presence of barberry, the alternate host of the pathogen, drives stem rust epidemics in oats, and removal of the barberry bushes would not only limit development of the disease but also reduce the genetic variation in the stem rust pathogen. Even if the fungus rarely goes through a sexual cycle, such as the situation in Tajikistan, the genetic variation is high in that country. The mere presence of barberry within an area enables a large genetic variability within the pathogen. Stem rust does not seem to be common on wheat in Sweden. This may be due to the lack of virulent genotypes of the pathogen, but if they were present, stem rust could become a major problem in wheat production, since all the prerequisites for epidemics are already present.

Authors/Creators:Berlin, Anna
Title:Population biology of Puccinia graminis
Subtitle:implications for the epidemiology and control of stem rust
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2012
Number of Pages:66
I.A. Berlin, B. Samils, A. Djurle, H. Wirsén, L. Szabo, and J. Yuen (2012). Disease development and genotypic diversity of Puccinia graminis f. sp. avenae in Swedish oat fields. Plant Pathology Doi:10.1111/j.1365-3059.2012.02609.x
II.A. Berlin, A. Djurle, B. Samils, and J. Yuen (2012). Genetic variation in Puccinia graminis collected from oats, rye and barberry. Phytopathology 102(10), 1006-1012.
III.A. Berlin, M. Rahmatov, H. Muminjanov, and J. Yuen. Clonal and sexual reproduction of Puccinia graminis in Tajikistan (manuscript).
IV.A. Berlin, J. Kyiaschenko, A. Fejer Justesen and J. Yuen. A survey of some rust fungi forming aecia on Berberis spp. (submitted manuscript).
V.A. Berlin, K. Dalman and J. Yuen. Evolutionary history reveals two phylogenetically distinct species within Puccinia graminis (manuscript).
Place of Publication:Uppsala
Publisher:Dept. of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7726-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H20 Plant diseases
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:puccinia graminis, rusts, pathogens, phylogeny, genetic variation, berberis, host plants, sexual reproduction, taxonomy, sweden, tajikistan
Keywords:Berberis spp., epidemiology, phylogeny, sexual reproduction, taxonomy
Permanent URL:
ID Code:9222
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
External funders:Stiftelsen Lantbruksforskning
Deposited By: Anna Berlin
Deposited On:07 Nov 2012 12:37
Metadata Last Modified:02 Dec 2014 10:53

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