STUDIES ON THE INTERFERTILITY OF FOUR STRAINS OF PUCCINIA HELIANTHI SCHW.

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Abstract
A distinct strain of Puccinia Helianthi was collected on each of the following four species, Helianthus annuus, H. petiolaris, H. tuberosus, and H. subtuberosus. All possible combinations of reciprocal crosses, haploid pustule with haploid pustule, and haploid pustule with diploid pustule, were made among these four strains. Interfertile strains, when crossed, give rise to aecia in the formerly haploid pustules. On this basis, the strains fell into two groups: A, the strains on H. annuus and H. petiolaris, and B, the strains on H. tuberosus and H. subtuberosus. The two strains in each group were highly interfertile; but the two strains of one group were highly intersterile with the two strains of the other group. A parallelism exists between the crossing behavior of certain varieties of P. graminis and that of these two groups. It is suggested that each of these two groups of P. Helianthi may represent a variety.

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