Akademik Veri Yönetim Sistemi
PAKISTAN JOURNAL OF BOTANY, cilt.38, sa.5, ss.1431-1437, 2006 (SCI-Expanded)
Centurea spicata, C. fenzlii and C. kurdica are widely used as ornamental plants in the Mediterranean and East Anatolian regions of Turkey. C. spicata occupies serpentine habitats in the macchia formations whereas C. fenzlii and C. kurdica cover basaltic and dolomitic habitats among the tragacanthic steppe. However, these species are facing a threat of extinction due to overexploitation. As such, an attempt was made to investigate the possibilities for then propagation. For this purpose, the seeds were placed for germination at Optimum temperature (25 1(C-0) in different concentrations of KNO3, HCl and NaCl. Two different photoperiods (8 hours light-16 hours darkness-I and 16 hours light-8 hours darkness-II) were used to mimic the natural conditions. Studies on the germination of three species undertaken to evaluate the possibilities to cultivate the native populations at a large scale showed that C. spicata did not germinate at 3 % NaCl, 2-3 % HCl and 3 % KNO3 under,both photoperiods, but germination rate was highest in 11,1 % KNO3 whereas germination percentage was higher in 0.5% KNO3 and control group under photoperiod 1. Under photoperiod 11 germination rate was highest in 1% NaCl and control. In the case of C. fenzlii the germination failed in 3 % NaCl, 2-3% HCl and 3 %KNO3 under both photoperiods but under photoperiod I the germination rate was highest in control and 0.5% KNO3, whereas the highest percentage germination was examined in control and 1% KNO3. Under photoperiod 11 germination rate was highest in 1-2 %NaCI and control, and germination percentage was highest in control and 0.5% KNO3. In C. kurdiect under photoperiod I germination rate was highest in control and 1% KNO3 but percentage germination was highest in control and 0.5 % KNO3, whereas under photoperiod II rate of germination was highest in control and I % KNO3 and germination percentage in control and 0.5% KNO3.