Ph.D. Tezi Görüntüleme

       In this study, seed dormancy removal and seed characteristics of two major maple species (Acer trautvetteri Medyedev and Acer cappadocicum Gleditsch) of the eastern Black Sea region were studied. To do that, seeds of both species were collected in 2006, 2007 and in 2008. Collection were carried out two or three times each year with 15-day intervals between each collection. Seed width, length, thickness, 1000 seed weight, seed viability percentage by tetrazolium test were determined every year and for collection time.

       This research showed that seeds of both Acer species exhibit physiological dormancy and require stratification process to overcome seed dormancy. The highest percentage of germination in both species were obtained with cold stratification after eight weeks and sawing in the greenhouse in early spring. Acer cappadocium had 97 % whereas Acer trautwetteri had 81 % germination rates. Optimal germination temperature for both species in the growing chamber was +5o C. The highest germination percentages in the growing chamber subjected to GA3 process after eight weeks of stratification were 66 % and 62 % for Acer trautvetteri and Acer cappadocicum, respectively. The highest germination percentage in the field were obtained in seeds sown in early spring (81 % for Acer cappadocium and 74 % for Acer trautvetteri) after eight weeks of stratification.