The effect of soma applications on germination and dormancy of Jerusalem artichoke (Helianthus tuberosus L.) seed

This research is planned to solve the germination problem of true seeds of an abnormal tuber-forming Jerusalem Artichoke. For this purpose, different doses of GA3 (0, 250, 500, 750 and 1000 ppm) were applied to seeds. In addition, folding at different temperatures (5ºC and 20ºC) and times (15, 30, 45 days) was carried out. The effects of physical injury of seeds (scratching and non-scratching) on germination were investigated. At the same time, germination rates were examined by planting in different periods (November, January, March, April and May). In addition, the some morphological and chemical properties of the seeds were examined. It was determined that GA3 applications didn't effect on the germination of Jerusalem artichoke seeds. It was determined that the seed germination rate increased significantly with the folding applications. It was determined the germination at the level of 70% with 30-day folding and 85% with 45-day folding. It was obseved that when sowing, late, seeds did not germinate, but when planted in early periods, germination occurred. It was determined that GA3 + folding and folding + GA3 applications did not significantly increase germination. As a result, it has been determined that the need for chilling must be met in order to ensure the germination of Jerusalem artichoke true seeds, and the problem was solved by both folding and early sowing.