Figure 1.

Germination of seeds with various dormancy statuses. A, Schematic depiction of pretreatments used to obtain seeds with various dormancy statuses. The fresh seeds were cold stratified (4°C) for 12 d, and seed germination was tested at 4-d intervals; the 12-d-cold-stratified seeds were transferred to 35°C moist conditions and tested for germination at 10-d intervals. B and C, Germination of seeds after pretreatment: (B) 4°C cold stratification and (C) 35°C heat stress. Vertical bars in B and C indicate ses. The same uppercase letters indicate no significant difference (P > 0.05) among germination percentages at 30°C. The same lowercase letters indicate no significant differences (P > 0.05) among germination percentages at 20°C. The asterisks indicate a significant difference (P < 0.05) between germination percentages of the same seed lot at 20°C and 30°C. D, Average monthly mean, maximum, and minimum temperatures in the natural habitat of the C. lanceolata trees used in this study. Data are from the 2000 to 2010 record from the Portal of Chinese Science and Technology Resource (http://www.escience.gov.cn).