. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 44 MASS. EXPERIMENT STATION BULLETIN 202. order to bring the data into shape for plotting a constant curve of tempera- ture and germination. PLATE III. tJerrrj nation. lOOl Temperature limits for germination or Utedmlosporesof Curve showing temperature limits for germination of urediniospores of Puccinia Antirrhini. The optimum temperature for the germination of the urediniospores of P. Antirrhini was found to be 10° C, the minimum, 5° C, and the maximum, 20° C. When the data are plot
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 44 MASS. EXPERIMENT STATION BULLETIN 202. order to bring the data into shape for plotting a constant curve of tempera- ture and germination. PLATE III. tJerrrj nation. lOOl Temperature limits for germination or Utedmlosporesof Curve showing temperature limits for germination of urediniospores of Puccinia Antirrhini. The optimum temperature for the germination of the urediniospores of P. Antirrhini was found to be 10° C, the minimum, 5° C, and the maximum, 20° C. When the data are plotted, a curve is obtained that is nearly sjonmetrical. A most striking fact is that if the temperature is varied 2° C. above or below the optimum, the germmation falls off 50 per cent. In the following table each relative germination is the mean of five experiments: — Table 1. — Relative Germination of Urediniospores of P. Antirrhini Diet, and Hohv., compared to the Germination at 10° C. taken as 100. 5°C. 6°C. 7°C. 8°C. 9°C. 10° C. 11° C. 12° C. 14° C. 15° C. 18° C. 20° C. 30° C. 0 0 1 0 1 0 0 0 4 0 4 3 27 0 7 13 35 37 4 21 50 30 50 12 30 100 100 100 100 100 100 42 9 14 72 21 15 32 16 0 12 0 42 2 22 13 0 6 1 0 0 1 0 1 1 0 0 0 0 0 0 0 0 0 r 22 100 21 13 .75 0 Conditions affecting Longevity of Urediniospores. The spores used in the previously described germination tests were taken fresh from growing plants. It was noticeable that their viability grad- ually diminished if the leaves dried out long in the room. To determine. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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