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Inheritance of Seedling Reaction to Races 7 and 8 of Puccinia graminis avenae Eriks. and Henn. at High Temperature in Three Oat Crosses 1
Author(s) -
Koo F. K. S.,
Moore M. B.,
Myers W. M.,
Roberts B. J.
Publication year - 1955
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/agronj1955.00021962004700030003x
Subject(s) - dept , biology , seedling , botany , genetics
been extensively used in oat breeding programs throughout the United States and Canada. At high as well as moderate temperatures, the White Russian type, including Iowa D69, is responsible for resistance to races 1, 2, 5 , 8, 9, 10, and 11 of Puccinia gruminis nveizue while the Richland type, induding Rainbow, is responsible for resistance to races 1, 2, 3, 5, 7 , 7A, and 12. The “Canadian” type, represented by the selections such as Hajira-Joanette (R.L. 81 1) and Victoria-Hajira-Banner (R.L. 1276), provides resistance at moderate temperature to all known races except race 7A. The factors for resistance of the first two types were found to be allelic by Smith ( 4 ) , Cochran et al. ( I ) , and Litzenberger ( 3 ) , while the factor for the “Canadian” type was shown by Foote3 to be inherited independently from that for either of the first two types. Recently, Welsh and Johnson ( 5 ) reported that some selections derived from crosses involving Hajira carry two genes for resistance to all known races except 7A while others have three genes for resistance to all races including 7A. From their results, they concluded that the gene A, which conditions resistance to a group of races, including race 7A, is of the Richland typz and that the other two genes, B and C, which together are responsible for resistance to all known races except 7A, are associated in inheritance. They further suggested the possibility that gene C alone causes resistance to all races except 7A. If so, it is analogous to the “Canadian” factor of Foote: and Kehr, et ul. (2). Studies at Minnesota, reported by Koo et ~ l . , ~ ~ ~ have shown that all three types of stem rust resistance are combined in selections made from the cross [Landhafer x (Mindo x Hajira-Joanette)] x Andrew. This finding has led to a reconsideration of the hypothesis of allelism of the factors for the White Russian and Richland types of resistance. Three new-crosses were made between one of the selections carrying combined resistance and three varieties, Andrew, Clinton and Gopher, for a study of the nature of this zombined resistance and its mode of inheritance. Results of T w h . ite Russian, Richland, and “Canadian” types, have