Threshold Size for Vernalization in Senecio jacobaea: Genetic Variation and Response to Artificial Selection

摘要: 1. Flowering in Senecio jacobaea is dependent on plant size at the time of vernalization and photoinduction spring. We present data genetic variation threshold for this species. 2. Field measurements revealed ample phenotypic flowering a natural sand dune population S. jacobaea. The parental generation artificial selection experiment, carried out climate chamber, showed that character was also very high. 3. In experiment offspring from different lines were compared. 56% largest plants did not flower. Large remained vegetative flower after second period growth subsequent vernalization. A line ability to under conditions provided established by selecting plants. One decreased non-flowering fraction 20%, compared 38% control group, which sample same seed pool as generation. 4. line, took place low sizes vernalization, smallest group decreased, addition median much lower than selected only, indicating successful. 5. Significant differences found among five clonal families grown controlled environment. within-clone percentage always below 100% large 6. results show has component, may be subject selection.