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Effect of Host Plant Materials and Temperature on Germination of Teliospores of Puccinia carthami. J. M. Klisiewicz, Plant Pathologist, Plant Science Research Division, ARS, USDA, University of California, Davis 95616; Phytopathology 62:436-438. Accepted for publication 3 November 1971. DOI: 10.1094/Phyto-62-436.

Teliospores of Puccinia carthami germinated poorly or not at all in water, on water agar, or on various agar media. Germination was stimulated on water agar supplemented with materials derived from leaves, stems, and roots of safflower. Germination of teliospores of collections C1 and C2 was greatly stimulated on safflower extract agar. C2 teliospores received some stimulation from medium containing extracts from nonhost plants, but C1 spores were not stimulated. Teliospores of the two collections germinated best at 18-24 C with optimum for germination at about 24 C, but differed in amount and rate of germination. The different germination traits recurred among teliospores from re-established infections on safflower.