scholarly journals Genetic analysis of resistance of wheat cultivars to races and some formae speciales of Erysiphe graminis DC.

1986 ◽  
Vol 52 (4) ◽  
pp. 700-708 ◽  
Author(s):  
Takashi OKU ◽  
Shuichi YAMASHITA ◽  
Yoji DOI ◽  
Unji HIURA
Keyword(s):  
Genetic Analysis ◽  
Erysiphe Graminis ◽  
Wheat Cultivars ◽  
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

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

RESISTANCE IN WHEAT TO FORMAE SPECIALES TRITICI AND SECALIS OF PUCCINIA GRAMINIS

1971 ◽  
Vol 13 (1) ◽  
pp. 119-127 ◽  
Author(s):  
A. K. Sanghi ◽  
N. H. Luig
Keyword(s):  
Stem Rust ◽  
Virulence Genes ◽  
Somatic Hybrids ◽  
Puccinia Graminis ◽  
New Combinations ◽  
Wheat Cultivars ◽  
Wheat Stem Rust ◽  
Formae Speciales ◽  
Two Hybrid

Nine genes conditioning resistance to cultures of P. graminis tritici (possessing unusual genes for avirulence), P. graminis secalis, and sexual or somatic hybrids between these formae speciales were found in the wheat cultivars Mentana and Yalta. In Mentana, Sr8 operated against all six cultures utilized; but in Yalta, Sr11 conditioned resistance to only two hybrid cultures. In addition, four other genes in Mentana and three genes in Yalta operated against the cultures.The present study indicates that hybridization between wheat stem rust and rye stem rust can be important in producing new combinations of virulence genes which can attack known genes for resistance in wheat. The implications of such hybridization in relation to the transference to wheat of resistance in rye to P. graminis tritici are discussed.

A genetic analysis of the spring-winter habit of growth in wheat

1971 ◽  
Vol 22 (1) ◽  
pp. 21 ◽  
Author(s):  
AT Pugsley
Keyword(s):  
Genetic Analysis ◽  
Winter Wheat ◽  
Positive Response ◽  
Wheat Cultivars ◽  
Developmental Patterns ◽  
Wide Range ◽  
Winter Wheat Cultivars ◽  
Dominant Genes ◽  
Made In

Developmental patterns of growth have been studied in nine spring and 10 winter wheat cultivars and in a number of crosses involving both groups. Among the spring cultivars five responded to vernalization while four did not. There was a very wide range in responsiveness to vernalization among the winter cultivars, ranging from the responsive Winter Minflor to Jones Fife which appeared not to respond at all to the '30-day vernalization test'. The spring habit of growth was governed by three dominant genes, any one of which was able to inhibit the expression of the winter habit. Progress has been made in establishing relationships among several spring cultivars. Those carrying the gene Sk, either alone or in combination with others, appeared to be non-responsive to vernalization. In the absence of Sk all spring cultivars so far tested exhibited a positive response. Winter selections made from spring-winter crosses always resembled the winter parent with respect to the intensity of the winter characteristic. While all winter wheats carry recessive alleles at all three loci, the differences in expression which exist between them appear to have been due to the presence of multiple recessive alleles at these loci. Further evidence of the association of leaf and spikelet numbers with days to ear emergence is presented.

Genetic analysis of DNA fingerprints and virulences in Erysiphe graminis f.sp. hordei

1994 ◽  
Vol 26 (2) ◽  
pp. 172-178 ◽  
Author(s):  
James K. M. Brown ◽  
Craig G. Simpson
Keyword(s):  
Genetic Analysis ◽  
Erysiphe Graminis ◽  
Dna Fingerprints
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