A Group of Expressed cDNA Sequences from the Wheat Fungal Leaf Blotch Pathogen, Mycosphaerella graminicola (Septoria tritici)

2000 ◽  
Vol 29 (2) ◽  
pp. 118-133 ◽  
Author(s):  
John Keon ◽  
Andy Bailey ◽  
John Hargreaves
Keyword(s):  
Mycosphaerella Graminicola ◽  
Septoria Tritici ◽  
Leaf Blotch ◽  
Cdna Sequences

Analysis of expressed sequence tags from the wheat leaf blotch pathogen Mycosphaerella graminicola (anamorph Septoria tritici)

2005 ◽  
Vol 42 (5) ◽  
pp. 376-389 ◽  
Author(s):  
John Keon ◽  
John Antoniw ◽  
Jason Rudd ◽  
Wendy Skinner ◽  
John Hargreaves ◽  
...  
Keyword(s):  
Expressed Sequence Tags ◽  
Mycosphaerella Graminicola ◽  
Septoria Tritici ◽  
Leaf Blotch ◽  
Wheat Leaf ◽  
Expressed Sequence

Surveys of speckled leaf blotch and other foliar diseases of wheat in Victoria, 1974 to 1978

1980 ◽  
Vol 20 (102) ◽  
pp. 94 ◽  
Author(s):  
JS Brown ◽  
RG Paddick
Keyword(s):  
Yield Loss ◽  
Mycosphaerella Graminicola ◽  
Septoria Tritici ◽  
Puccinia Recondita ◽  
Puccinia Graminis ◽  
Yield Losses ◽  
Leaf Blotch ◽  
Average Percentage ◽  
Leptosphaeria Nodorum ◽  
Glume Blotch

The severity of speckled leaf blotch (Mycosphaerella graminicola (Fuckel) Schroeter, Septoria tritici Rob. ex Desm.) in wheat crops was surveyed in the Wimmera during the 1974-77 seasons and in all the major wheat growing areas of Victoria in 1978. Speckled leaf blotch was found in all crops and the severity varied greatly within and between seasons. The average percentage of affected area on the penultimate leaf of main tillers was 24%, 28%, 1.5%, 0% and 9.4%, respectively, for the successive seasons. The corresponding grain yield losses were estimated at 19, 21, 5, 0 and 12% by using an experimentally derived relation between yield loss and disease severity. In 1978, glume blotch (Leptosphaeria nodorum (Miiller, Septoria nodorum (Berk.) Berk.), stem rust (Puccinia graminis Pers. f sp. tritici Erikss and Henn.), leaf rust (Puccinia recondita Rob. ex Desm. f sp, tritici Erikss) and powdery mildew (Erysiphe graminis DC. f sp. tritici E. Marchal) occurred in 8%, 3%, 1% and 0.5%, respectively, of the crops sampled. These surveys have shown speckled leaf blotch to be the most important foliar disease of wheat in Victoria.

scholarly journals Population Structure ofMycosphaerella graminicolaand Location of Genes for Resistance to the Pathogen: Recent Advances in Argentina

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
María Rosa Simón ◽  
Cristina A. Cordo ◽  
Nadia S. Castillo ◽  
Paul C. Struik ◽  
Andreas Börner
Keyword(s):  
Population Structure ◽  
Genetic Variability ◽  
Geographic Area ◽  
Mycosphaerella Graminicola ◽  
Septoria Tritici ◽  
Wheat Cultivars ◽  
Leaf Blotch ◽  
The World ◽  
New Germplasm ◽  
New Cultivars

Leaf blotch of wheat (Septoria triticiRob. ex Desm., teleomorphMycosphaerella graminicola(Fückel) Schröt. in Cohn) causes significant losses in wheat. During the last decades studies about the genetic variability of the pathogen and location of the resistance have been intensive around the world. The knowledge about the genetic variation ofM. graminicolais very important because it could allow us to determine which genotypes predominate within a geographic area. It also can be used to evaluate the germplasm resistance of wheat cultivars with isolates with high genetic differences. In addition, the knowledge of the genes conditioning resistance in different genotypes allows getting precise combination in new germplasm. The incorporation of the known genes in new cultivars could contribute to broadening the resistance to the pathogen. A paper about genetic variability of the pathogen and location of the resistance, with special emphasis in the work carried out in Argentina, is presented.

scholarly journals A Plant Pathologist on Wheat Breeding with Special Reference to Septoria Diseases

2011 ◽  
Vol 40 (No. 2) ◽  
pp. 63-71
Author(s):  
C. Zadoks J
Keyword(s):  
Plant Breeding ◽  
Mycosphaerella Graminicola ◽  
Wheat Breeding ◽  
Septoria Tritici ◽  
Stagonospora Nodorum ◽  
Participatory Plant Breeding ◽  
Leaf Blotch ◽  
Glume Blotch ◽  
Molecular Studies ◽  
Three Stages

This review has a personal, plant pathologist’s outlook on plant breeding. It touches upon some generalities, among which the “three stages” of plant breeding, participatory plant breeding and biotechnology in plant breeding. It delves deep into modern molecular studies on leaf blotch (anamorph Septoria tritici) and glume blotch (anamorph Septoria nodorum) of wheat. Epidemiological knowledge of the teleomorphs Mycosphaerella graminicola and Stagonospora nodorum has progressed with great strides. Consequences for applied plant breeding slowly become visible.  

scholarly journals Avirulence in the Wheat Septoria tritici Leaf Blotch Fungus Mycosphaerella graminicola Is Controlled by a Single Locus

2000 ◽  
Vol 13 (12) ◽  
pp. 1375-1379 ◽  
Author(s):  
Gert H. J. Kema ◽  
Els C. P. Verstappen ◽  
Cees Waalwijk
Keyword(s):  
Fragment Length Polymorphism ◽  
Random Amplified Polymorphic Dna ◽  
Mycosphaerella Graminicola ◽  
Septoria Tritici ◽  
Wheat Cultivars ◽  
Leaf Blotch ◽  
Dna Analyses ◽  
Differential Cultivars ◽  
Complex Locus ◽  
F2 Progeny

Segregation of avirulence in Mycosphaerella graminicola, a heterothallic ascomycete that causes wheat septoria tritici leaf blotch, was studied in F1, BC1, and F2 populations by inoculation assays on five wheat cultivars in the seedling stage and by amplified fragment length polymorphism and random amplified polymorphic DNA analyses. F1 was generated by crossing isolates IPO323 (avirulent) and IPO94269 (virulent). All F1, BC1, and F2 progeny isolates were virulent on the susceptible check cultivar Taichung 29 and were avirulent on the resistant check cultivar Kavkav-K4500. Avirulence segregation was observed in F1 and in several BC1 and F2 generations on the differential cultivars Shafir, Kavkaz, and Veranopolis at a 1:1 ratio. Avirulence for the three differential cultivars always cosegregated. We conclude that avirulence in isolate IPO323 is controlled by a single, seemingly complex locus.

Zymoseptoria ardabiliae and Z. pseudotritici, two progenitor species of the septoria tritici leaf blotch fungus Z. tritici (synonym: Mycosphaerella graminicola)

Mycologia ◽  
2012 ◽  
Vol 104 (6) ◽  
pp. 1397-1407 ◽  
Author(s):  
Eva H. Stukenbrock ◽  
William Quaedvlieg ◽  
Mohammad Javan-Nikhah ◽  
Marcello Zala ◽  
Pedro W. Crous ◽  
...  
Keyword(s):  
Mycosphaerella Graminicola ◽  
Septoria Tritici ◽  
Leaf Blotch

Microsatellite markers provide evidence for sexual reproduction of Mycosphaerella graminicola in Saskatchewan

Genome ◽  
2004 ◽  
Vol 47 (5) ◽  
pp. 789-794 ◽  
Author(s):  
M Razavi ◽  
G R Hughes
Keyword(s):  
Genetic Diversity ◽  
Genetic Variability ◽  
Sexual Reproduction ◽  
Primary Source ◽  
Mycosphaerella Graminicola ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Allelic Series ◽  
Evolutionary Potential ◽  
Wheat Field

This study examined the genetic structure of a Saskatchewan population of Mycosphaerella graminicola, cause of the foliar disease Septoria tritici blotch of wheat. Such knowledge is valuable for understanding the evolutionary potential of this pathogen and for developing control strategies based on host resistance. Nine pairs of single-locus microsatellite primers were used to analyze the genomic DNA of 90 isolates of M. graminicola that were collected using a hierarchical sampling procedure from different locations, leaves, and lesions within a wheat field near Saskatoon. Allelic series at eight different loci were detected. The number of alleles per locus ranged from one to five with an average of three alleles per locus. Genetic diversity values ranged from 0.04 to 0.67. Partitioning the total genetic variability into within- and among-location components revealed that 88% of the genetic variability occurred within locations, i.e., within areas of 1 m2, but relatively little variability occurred among locations. Low variability among locations and a high degree of variability within locations would result if the primary source of inoculum was airborne ascospores, which would be dispersed uniformly within the field. This finding was confirmed by gametic disequilibrium analysis and suggests that the sexual reproduction of M. graminicola occurs in Saskatchewan.Key words: Mycosphaerella graminicola, SSR markers, sexual reproduction, genetic diversity.

scholarly journals Reaction of winter wheat genotypes to infection by Mycosphaerella graminicola(Fuckel) Schroeter

2013 ◽  
Vol 55 (1) ◽  
pp. 233-246
Author(s):  
Ewa Mirzwa-Mróz ◽  
Czesław Zamorski
Keyword(s):  
Winter Wheat ◽  
Broad Spectrum ◽  
Mycosphaerella Graminicola ◽  
Wheat Breeding ◽  
Septoria Tritici ◽  
Wheat Cultivars ◽  
Breeding Lines ◽  
Wheat Genotypes ◽  
Winter Wheat Cultivars

The response of Polish winter wheat genotypes to <i>M.graminicola</i> (preliminary experiments and cultivar collections) was observed in different regions of Poland. Observations were carried out in 1995-1999. The winter wheat genotypes showed a broad spectrum of reaction to this pathogen. Between 1997 and 1999 the highest degree of infection on winter wheat breeding lines was noted in Kończewice. During this time no genotypes free from infection were observed (preliminary breeding experiments). Cultivars with no symptoms of <i>Septoria tritici</i> blotch (Leszczyńska Wczesna and Żelazna) were found among old genotypes in Słupia Wielka only in earlier experiments (1995-1996). In the years 1997-1999 the winter wheat cultivars were classified into groups on the basis of their response to the pathogen. The degree of infection for the majority cultivars was quite high.

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