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 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.

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

scholarly journals PHYSIOLOGIC RACES OF LOOSE SMUT OF WHEAT (USTILAGO TRITICI) IN BRAZIL

1977 ◽  
Vol 57 (4) ◽  
pp. 1033-1039 ◽  
Author(s):  
MILTON C. MEDEIROS ◽  
J. NIELSEN
Keyword(s):  
Durum Wheat ◽  
Common Wheat ◽  
Loose Smut ◽  
Formae Speciales ◽  
Ustilago Tritici ◽  
Differential Cultivars ◽  
Differential Cultivar ◽  
Standard Set ◽  
Physiologic Races

The occurrence in Brazil of physiologic races of loose smut, Ustilago tritici, (Pers.) Rostr., has been demonstrated. Twelve races were identified amongst 50 field collections of loose smut. Five of the races were classified as being similar to Canadian race T 2, and two races as T 8 when the standard set of differential cultivars was used. However, further differentiation of these races was possible on three supplemental differentials. Another four races were virulent on several differential cultivars of common wheat and on Pentad, a differential cultivar of durum wheat, and thus appear to invalidate the claim that formae speciales of Ustilago tritici exist on common wheat and on durum wheat.

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

scholarly journals Identification and Genetic Diversity of Formae Speciales of Setosphaeria turcica in China

Plant Disease ◽  
2015 ◽  
Vol 99 (4) ◽  
pp. 482-487 ◽  
Author(s):  
L. Tang ◽  
Z. G. Gao ◽  
Y. Yao ◽  
X. Liu
Keyword(s):  
Genetic Diversity ◽  
Polymerase Chain Reaction ◽  
Geographical Distribution ◽  
Leaf Blight ◽  
Pcr Analysis ◽  
Northern Leaf Blight ◽  
Chain Reaction ◽  
Setosphaeria Turcica ◽  
Formae Speciales ◽  
Polymerase Chain

Setosphaeria turcica is an important pathogen that causes northern leaf blight of corn and sorghum. In total, 188 isolates were isolated from diseased leaves of maize and sorghum in China. However, differences in morphology were not apparent among S. turcica isolates derived from different hosts. The formae speciales were identified as S. turcica. f. sp. zeae and S. turcica. f. sp. sorghi. Universally primed polymerase chain reaction (UP-PCR) analysis led to the conclusion that genetic differences were present among these formae speciales and divided these isolates into five clades. The isolates of each clade belonged to the same forma specialis, and different formae speciales were assigned to different clades. The results of the present study demonstrated that pathogenic specialization of the S. turcica isolate correlated more closely with genetic diversity than geographical distribution. Therefore, combined with assays for pathogenicity, UP-PCR analysis yields an enhanced understanding of the formae speciales of S. turcica.

A gene involved in the resistance of wheat to wheatgrass powdery mildew fungus

Genome ◽  
1987 ◽  
Vol 29 (6) ◽  
pp. 850-852 ◽  
Author(s):  
Y. Tosa ◽  
H. Tsujimoto ◽  
H. Ogura
Keyword(s):  
Powdery Mildew ◽  
Key Words ◽  
Common Wheat ◽  
Erysiphe Graminis ◽  
Wheat Cultivars ◽  
Powdery Mildew Fungus ◽  
Key Words Wheat ◽  
Hybrid Culture ◽  
The Common

A gene for resistance to Erysiphe graminis was detected in the common wheat cultivars 'Norin 4', 'Norin 26', 'Norin 29', 'Shin-chunaga', and 'Penjamo 62', using a hybrid culture derived from E. graminis f.sp. agropyri × E. graminis f.sp. tritici. The gene was located on chromosome 1D and designated Pm10. Pm10 was considered to be involved in the resistance of wheat to the wheatgrass powdery mildew fungus. Key words: wheat, resistance, powdery mildew, Erysiphe graminis.

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.

Identification of a gene for resistance to wheatgrass powdery mildew fungus in the common wheat cultivar Chinese Spring

Genome ◽  
1988 ◽  
Vol 30 (4) ◽  
pp. 612-614 ◽  
Author(s):  
Y. Tosa ◽  
H. Tokunaga ◽  
H. Ogura
Keyword(s):  
Triticum Aestivum ◽  
Powdery Mildew ◽  
Common Wheat ◽  
Chinese Spring ◽  
Wheat Cultivar ◽  
Erysiphe Graminis ◽  
Common Wheat Cultivar ◽  
Powdery Mildew Fungus ◽  
Hybrid Culture ◽  
The Common

A gene for resistance to Erysiphe graminis was detected in Triticum aestivum cv. Chinese Spring, strain Salmon, T. compactum cv. No. 44, and T. spelta var. duhamelianum, using a hybrid culture derived from E. graminis f. sp. agropyri × E. graminis f. sp. tritici. The gene was located on the short arm of chromosome 6B and designated Pm11. Pm11 was considered to be involved in the resistance of wheat to the wheatgrass powdery mildew fungus.Key words: wheat, resistance, powdery mildew, Erysiphe graminis.

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