LATE-DEVELOPING ORANGE PUSTULE OF PUCCINIA GRAMINIS VAR. TRITICI, RACE 56: POSSIBLE CONNECTION WITH CERTAIN MUTANTS AND AMPHISPORES
Abstract
Flecks appeared in leaves of Baart wheat (C.I. 1697) 13 days after inoculation with uredospores of an orange isolate from normal race 56 of Puccinia graminis Pers. var. tritici (Eriks. and E. Henn.) Guyot. The resulting pustules were orange; most remained orange, but some reverted and produced spores adjoining the orange pustules that were the parental red-brown color. Spores from the orange pustules differed from those of normal race 56 in shape, appearance of cytoplasm, cell wall, and stainability. Although germination of spores on agar from the orange pustules was low (4 to 5%) and that from the reverted portion of the pustules was high (90 to 95%), both types of spores were highly infective on Baart wheat. Sporulation resulting from inoculation with uredospores from the orange pustules occurred in 15 to 18 days; with uredospores from the reverted red-brown pustules, in the usual 8 to 10 days. Orange and reverted pustules consistently produced typical one- and two-celled teliospores. Reactions on differential varieties inoculated with spores from orange pustules were different from those of race 56 (most varieties were resistant); however, reactions on the differential varieties inoculated with spores from the red- brown reverted pustules were similar to those of race 56. These findings closely parallel those of other investigators on the behavior and appearance of amphispores (formerly called mesospores) in other Puccinia species and of certain orange mutants, aberrants, and dissociants in P. graminis.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1967
- Accession Number
- AD0813569
Entities
People
- Anthony V. Mattie
- Robert G. Emge
- William E. Miller