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Correlated inheritance of reaction to stem rust, leaf rust, bunt, and black chaff in spring-wheat crosses



Correlated inheritance of reaction to stem rust, leaf rust, bunt, and black chaff in spring-wheat crosses



Jour Agric Res 48(1): 59-66



The correlated reaction to stem rust, leaf rust, bunt and black chaff was studied in the Fs progeny of wheat crosses between H-44 with Double Cross No. 11-21-28 and Kota [CHI] Marquis No. 11-19-167, respectively, and H-35 [CHI] Marquis. Stem-rust resistance of the mature-plant type of the H-44 parent appeared to be dependent upon a single genetic factor difference. The moderate plant resistance of Nos. 11-21-28 and 11-19-167 appeared to be dependent upon factors not allelomorphic to those determining the mature-plant resistance of the H-44 type, as susceptible lines were obtained in F3. More than one factor pair was necessary to explain the stem-rust resistance of the mature plants of the H-35 parent in the crosses with Marquis. The number of factor pairs responsible for segregation of factors for reaction to leaf rust, bunt and black chaff could not be determined. The inheritance of reaction to the following combinations of diseases appeared to be independent as determined by the X2 test for independence: stem rust and bunt, leaf rust and bunt, leaf rust and black chaff, and black chaff and bunt. There appeared to -be linkage in inheritance of reaction to stem rust and leaf rust, and of reaction to stem rust and black chaff. However, it appears possible to combine the mature-plant stem-rust resistance of the H-44 type with the black chaff resistance of many varieties and hybrids of common wheat:.

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