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Inheritance Studies in Oats with Particular Reference to the Santa Fe Type of Crown Rust Resistance 1
Author(s) -
Osler R. D.,
Hayes H. K.
Publication year - 1953
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1953.00021962004500020003x
Subject(s) - forage , inheritance (genetic algorithm) , agricultural experiment station , library science , agronomy , biology , geography , agriculture , genetics , ecology , computer science , gene
ROWN rust of oats caused by the fungus Paccinia COYOC nata avenae Pers. Cda. has caused severe reduction in yields in some seasons. One of the difficulties encountered in breeding crown-rust resistant variseties has been the lack of sources of resistance. Murphy and Stanton (6) and Stanton and Murphy (8) report the introduction of resistant varieties including Victoria in 1927 aqd Bond in 1929. In 1940, according to Stanton and 'Coffman (7) , the first varieties carrying the Victoria type of crown-rust resistance were distributed to farmers. A few years later, new varieties of Victoria parentage, including Vicland and Tama, were widely distributed throughout the North Central oat-growing region. The extreme susceptibility to Helminthosporium blight of th'ese and other varieties of Victoria parentage in 1946 and later years and the close association of the Victoria type of crown-rust resistance with susceptibility to the blight led to the introduction of varieties carrying the Bond type of crown-rust resistance. In recent years, the increase of races of crown rust to which Bond is susceptible has made it imperative that other sources of resistance be found. Landhafer and Santa Fe introduced from South America in 1938 and 1945, respectively, have furnished two sources of crown-rust resistance that, so far as tested, have proved resistant to all North American races. Previous data regarding seedling reaction to 95 races of crown rust obtained by H. C. Murphy and summarized in 1950 by Finkner3 indicated that Landhafer had been tested for reaction to 80 and Santa Fe to 44 of those races. Both Landhafer and Santa Fe have been used extensively as sources of crownrust resistance and have been the two new types of crownrust resistance used in Minnesota studies. The main purpose of the present research was to study thme mode of inheritance of the Santa Fe type of crownrust resistance to a collection of races and to individual races, in crosses with selections carrying the Canadian type of resistance to many, and perhaps all known races of stem rust, and the Bond type of crown-rust resistance. Studimes