Researches on seed germination physiology of verbascum L. species endemic to Uludag

Thesis Type: Postgraduate

Institution Of The Thesis: Uludağ Üniversitesi, Turkey

Approval Date: 2001

Thesis Language: Turkish




In this study, the seed germination physiology of three endemic species of Verbascum L.5 diversified in Uludağ (Great Mountain or Mount Olympus), was investigated. The effects of stratification (15, 30 and 60 days) and stratification combined with GA3 treatments (50, 100 and 150 ppm) on germination were determined in seeds of V. olympicum Boiss., V. bombyciferum Boiss., V. prusianum Boiss. These species have been distributed on different altitudes of the mountain. While the habitat of V. olympicum found on upper altitudes, the other two species are distributed on lower. Stratification and stratification periods affected germination percentages in all the species. The stimulation effect of stratification (at 1 5 days) was found in V. olympicum, but this impact was occurred negatively at the long period treatments (at 30 and 60 days). Regarding the other two species, stratification did not stimulate seed germination. Even, stratification treatments decreased the germination rates in V. prusianum. It was concluded that the seeds of V. olympicum required shorter period of stratification (15 days), V. bombyciferum and V. prusianum can not need stratification for high germination achievement. In addition, we were found that the long period of stratification caused secondary dormancy, but this effect can disappeared by stratification combined with GA3 treatment. The high germination percentage was found in control (untreated) for three species (%81+13 in V. olympicum, %96+l in V. bombyciferum, %93+2 in V. prusiamim). According to this high germination percentages, it can be said these species have high adaptation capacity to their habitats.