Temperature Relations of Germination in Acer platanoides L. Seeds
Abstract:The aim of this study was to describe the effect of temperature on the germination response of Acer platanoides L. seeds and the possible influence of dormancy. Moist chilled seeds (fruits) from eight trees were germinated at eight constant temperatures from 3 to 32°C for 30 days. The highest germination was obtained at temperatures below 10°C and the highest rate of germination was between 22 and 28°C. The critical lower temperature for germination was estimated to be -2.6°C, and the critical upper temperature between 30 and 35°C. Temperatures above 10-15°C increasingly inhibited the germination of seeds. Some of the non-germinated seeds were able to germinate after a second chilling period, possibly as a consequence of further release of primary dormancy and an indicated secondary dormancy. Seed survival decreased with increasing temperatures above 15°C. The rate of germination was correlated with the accumulated thermal time at suboptimal temperatures. In conclusion, a constant temperature of 10°C is recommended for testing the germination of seeds of A. platanoides.
Document Type: Research Article
Publication date: 2001-09-01