INHERITANCE OF RESISTANCE TO USTILAGO NUDA IN BARLEY

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Abstract
The inheritance of resistance to loose smut races Tr and Ts (a new race) was studied in several barley crosses and backcrosses in which the varieties Jet and Titan were the resistant parents. Jet is resistant to race Tr and race Ts, Titan to race Tr only. Genetical analyses were based (a) on a classification of F2 plants according to the smut reaction of their F3 progeny, and (b) on the reaction of selfed generation backcrosses involving recessive (susceptible) parents. The resistance of Titan and of Jet to Tr was found in each case to be due to a single, dominant gene, designated as Un and Un3, respectively. The resistance of Jet to Ts was also found to be due to a single, dominant gene. This is probably a "new" gene and has been provisionally designated Un6. Resistance was found to be determined by the genetic constitution of the developing embryo rather than by that of surrounding floral structures.

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