مقارنة تأثير معامالت مختمفة لكسر سكون بذور أشجار بودرة العفريت Brachychiton populneus المستزرعة في منطقة الجبل الأخضر-ليبيا

Abstract EN

Brachychiton populneus is an ornamental tree that adapts ecologically and newly- introduced to Al-jabal Al-akhdar region - Libya.

The study aimed to investigate the effect of several different breaking-dormancy treatments for the seeds of Brachychiton populneus Including the treatments of soaking in concentrated sulphuric acid for periods of (10, 20 and 30) minutes, the scarification (mechanical scarification, scarification with soaking in gibberellin lOOppm, scarifica- tion with soaking in Indole-3-butyric acid lOOppm), soaking in hot water for periods of (20, 30 and 40) minutes, soaking in gibberellin concentrations 100, 200, and 300pmm, and finally soaking in Indole-3-butyric acid concentrations 100, 200, and 300pmm.

Results showed the superiority of treatment of soaking in concentrated sulphuric acid for 30 minutes on all treatments with a germi- nation percentage of 92% and the lowest average germination time of 3.56 days followed by differ- ent scarification treatments, while plant hormon treatments (GA3, IBA) were ineffective in break- ing dormancy and improving germination.

The study concluded that the best method for breaking dormancy caused by the hardness of Brachychiton populneus seeds was the treatment of concen- trated sulphuric acid for 30 minutes.