Isozyme Variation and Genetic Distances of Erysiphe graminis DC. Formae Speciales

1990 ◽  
Vol 129 (2) ◽  
pp. 89-101 ◽  
Author(s):  
G. Koch ◽  
W. Köhler
Keyword(s):  
Genetic Distances ◽  
Erysiphe Graminis ◽  
Isozyme Variation ◽  
Formae Speciales

Geographical distribution of genes for resistance to formae speciales of Erysiphe graminis in common wheat

1995 ◽  
Vol 91 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Y. Tosa ◽  
M. Kusaba ◽  
N. Fujiwara ◽  
T. Nakamura ◽  
A. Kiba ◽  
...  
Keyword(s):  
Geographical Distribution ◽  
Common Wheat ◽  
Erysiphe Graminis ◽  
Formae Speciales

Genetic analysis of interactions between Aegilops species and formae speciales of Erysiphe graminis

1995 ◽  
Vol 70 (1) ◽  
pp. 127-134
Author(s):  
Yukio TOSA ◽  
Keishi MATSUMURA ◽  
Takehiko HOSAKA
Keyword(s):  
Genetic Analysis ◽  
Erysiphe Graminis ◽  
Aegilops Species ◽  
Formae Speciales

Genetic analysis of the avirulence of wheatgrass powdery mildew fungus on common wheat

Genome ◽  
1989 ◽  
Vol 32 (5) ◽  
pp. 913-917 ◽  
Author(s):  
Y. Tosa
Keyword(s):  
Triticum Aestivum ◽  
Powdery Mildew ◽  
Genetic Analysis ◽  
Common Wheat ◽  
Erysiphe Graminis ◽  
Wheat Cultivars ◽  
Avirulence Genes ◽  
Powdery Mildew Fungus ◽  
Major Genes ◽  
Formae Speciales

F1 hybrid cultures between Erysiphe graminis f.sp. agropyri (wheatgrass mildew fungus) and E. graminis f.sp. tritici (wheat mildew fungus) were produced by using a common host of the two formae spéciales. When three common wheat cultivars, Triticum aestivum cv. Norin 4, T. aestivum cv. Norin 10, and T. compactum cv. No. 44, were inoculated with a population of F1 cultures, avirulent and virulent cultures segregated in a 3:1 ratio. This indicated that two major genes are involved in the avirulence of E. graminis f.sp. agropyri, Ak-1, on each of the three cultivars. Further analyses revealed that the three pairs of avirulence genes have one gene in common. On T. aestivum cv. Shin-chunaga, T. aestivum cv. Norin 26, and a strain of T. macha, the F1 population segregated in the same pattern as on T. aestivum cv. Norin 4, indicating that the same pair of avirulence genes is operating on these four cultivars. On T. aestivum cv. Red Egyptian the distribution of F1 phenotypes was continuous, suggesting that no major genes are involved in the avirulence of Ak-1 on this cultivar.Key words: powdery mildew, Erysiphe graminis, avirulence, wheat, wheatgrass.

scholarly journals Recognition of two formae speciales of Erysiphe graminis by wheat cells.

1985 ◽  
Vol 51 (2) ◽  
pp. 223-226 ◽  
Author(s):  
Yukio TOSA ◽  
Kazuyuki MISE ◽  
Jiko SHISHIYAMA
Keyword(s):  
Erysiphe Graminis ◽  
Formae Speciales

Cytological aspects of interactions between formae speciales of Erysiphe graminis and genera of gramineous plants, and their evolutionary implications

1990 ◽  
Vol 68 (6) ◽  
pp. 1249-1253 ◽  
Author(s):  
Y. Tosa ◽  
T. Akiyama ◽  
H. Ogura
Keyword(s):  
Triticum Aestivum ◽  
Cell Wall ◽  
Hordeum Vulgare ◽  
Secale Cereale ◽  
Avena Sativa ◽  
Erysiphe Graminis ◽  
The Other ◽  
Formae Speciales ◽  
Ancestral Form ◽  
Host Parasite

The progress of infection in leaves of wheat (Triticum aestivum), rye (Secale cereale), wheatgrass (Agropyron tsukushiense), barley (Hordeum vulgare), and oat (Avena sativa) inoculated with Erysiphe graminis f.sp. tritici, secalis, agropyri, and hordei was observed using a fluorescence microscope. Relative compatibility of each host–parasite combination was estimated by the incidence of cell wall penetration. Formae speciales tritici, secalis, and agropyri were highly compatible with any accession of wheat, rye, and wheatgrass, but less compatible with barley. On the other hand, f.sp. hordei was highly compatible with any of these four hosts. The four formae speciales had very low compatibility with oat, although f.sp. hordei was relatively more compatible with this host. These results suggested that (i) f.sp. tritici, secalis, and agropyri are phylogenetically very close; (ii) f.sp. hordei is less close to f.sp. tritici, secalis, and agropyri, and closer than these to the ancestral form of E. graminis; (iii) f.sp. avenae is remote from f.sp. tritici, secalis, agropyri, and hordei, but relatively less remote from f.sp. hordei than from the other three formae speciales.

Isozyme variation in balsam poplar along a latitudinal transect in northwestern Ontario

1988 ◽  
Vol 18 (8) ◽  
pp. 1078-1081 ◽  
Author(s):  
R. E. Farmer Jr. ◽  
W. M. Cheliak ◽  
D. J. Perry ◽  
P. Knowles ◽  
J. Barrett ◽  
...  
Keyword(s):  
Genetic Differentiation ◽  
Random Mating ◽  
Genetic Distances ◽  
Isozyme Variation ◽  
Average Heterozygosity ◽  
Balsam Poplar ◽  
Northwestern Ontario ◽  
Enzyme Systems ◽  
Latitudinal Transect ◽  
F Statistics

Isozyme characteristics were examined for eight enzyme systems in five 50-tree populations of balsam poplar (Populusbalsamifera L.) collected at longitude 90°W, from latitudes 45 to 55°N. Fifty-four percent of the trees were polymorphic at one or more loci, and 8 of the 17 loci examined were polymorphic in one or more populations. Average heterozygosity was low (0.037) and varied little among populations (0.025–0.043). No significant departure of multilocus genotypic proportions from those expected under random mating was observed. Genetic distances and F-statistics indicated that there is little genetic differentiation among populations in terms of the observed enzyme systems.

Isozyme variation between species and formae speciales of the genus Puccinia

1981 ◽  
Vol 59 (12) ◽  
pp. 2628-2634 ◽  
Author(s):  
J. J. Burdon ◽  
D. R. Marshall
Keyword(s):  
Gel Electrophoresis ◽  
Soluble Proteins ◽  
Isozyme Variation ◽  
Starch Gel Electrophoresis ◽  
Banding Patterns ◽  
Formae Speciales ◽  
Starch Gel

Soluble proteins extracted from germinating urediniospores of 11 different species of Puccinia Pers. and from three formae spéciales of each of 3 of these species were subjected to starch gel electrophoresis and the resultant isozyme banding patterns compared.Isozyme patterns obtained for the 11 different species showed considerable differentiation between species, indicating that all species were distinct taxonomic entities. Patterns obtained for the formae speciales were, in general, much more similar and suggested relationships which agree with existing knowledge from taxonomic and fertility studies.

Isozyme variation of Microsporum canis and M. cookei from New Zealand

1998 ◽  
Vol 36 (5) ◽  
pp. 255-262
Author(s):  
SIMPANYA ◽  
JARVIS ◽  
BAXTER
Keyword(s):  
New Zealand ◽  
Microsporum Canis ◽  
Isozyme Variation
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