A MUTATION IN PUCCINIA RECONDITA ROB. EX. DESM. F. SP. TRITICI TO VIRULENCE ON TRANSFER, CHINESE SPRING × AEGILOPS UMBELLULATA ZHUK.

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Abstract
A culture of wheat leaf rust, Puccinia recondita Rob. ex. Desm. f. sp. tritici, producing infection type 1 + on Transfer wheat was shown to be heterozygous for virulence at the locus conditioning this infection type, with virulence being incompletely dominant. Aegilops umbellulata Zhuk., the source of the resistance carried by Transfer, was highly resistant to cultures that were homozygous avirulent with respect to the Transfer gene and to cultures heterozygous for virulence to this gene, but it was only moderately resistant to cultures homozygous for virulence to the Transfer gene. Although other species of Aegilops tested varied in reaction from resistant to susceptible, each reacted in the same way to cultures which were either virulent or avirulent on Transfer.