INHERITANCE OF LOOSE SMUT RESISTANCE: I. INHERITANCE OF RESISTANCE TO A TREBI-ATTACKING CULTURE OFUSTILAGO NUDA(JENS.) ROSTR. IN FIVE BARLEY VARIETIES OF ABYSSINIAN ORIGIN

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Abstract
The immune reaction of the barley varieties Bifarb (C.I. 3951-3), Kitchin (C.I. 1296-1), Nigrinudum (C.I. 2222), Jet (C.I. 967), and C.I. 5798 to a Trebi-attacking culture of Ustilago nuda (Jens.) Rostr. was studied in the F2and F3generations of crosses between these varieties and the U. nuda susceptible variety Newal (C.I. 6088). Resistance was found to be conditioned by single dominant genes. Studies of the F3and F4generations of crosses among the immune varieties indicated that the genes for immunity were each located at the same locus. A study of the F3generation of a cross between Jet and the third outer-glume mutant from Valkie (C.I. 5748), designated herein as Valkie-trd, indicated that these genes for immunity differed from that in Valkie. Because of the similarity of the genetics of reaction to U. nuda in the five varieties, it was concluded that they probably originated from a common Abyssinian ancestor.

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