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Propagation of Ornamental Plants
17(4): 120-125, 2017

EFFECT OF LIGHT, TEMPERATURE, AND DIFFERENT PRE-TREATMENTS
ON SEED GERMINATION OF CAMPANULA GLOMERATA L. SUBSP. HISPIDA (WITASEK) HAYEK (CAMPANULACEAE)

Fatih GülbaДџ1* and Mustafa Ercan Özzambak2

1 Atatürk Central Horticultural Research Institute, 17 Yali str., 77102 Yalova, Turkey, *Fax: + 90 226 8141146, *E-mail: fatihgulbag@hotmail.com>
2 Ege University, Faculty of Agriculture, Department of Horticulture, 7 Ankara str.,
35100 Bornova, Д°zmir, Turkey



The study was undertaken to determine the effects of different pre-treatments, temperature regimes, and light on the germination of Campanula glomerata L. subsp. hispida (Witasek) Hayek collected from nature. In the first experiment, the effects of a total of 20 different treatments including gibberellic acid (GA3), stratification, and control groups were investigated. The germination test was carried out at +20°C under photoperiod (12/12 h dark/light) conditions. The second experiment was a germination test on seeds treated with 1000 mg l-1 GA3 under 4 different temperature regimes (15°C, 20°C, 25°C, and 10/20°C) and two different light periods (continuous darkness and photoperiod). Germination was quantified as final germination percentage (FGP), mean germination time (MGT), and germination index (GI). Control seeds had final germination 13.5%, mean germination time of 15.2 days, and germination index value of 0.4. The most successful germination results were obtained from exposure to 750 mg l-1 GA3 (FGP: 73.0%, MGT: 7.8 days, GI: 4.8) and 1000 mg l-1 GA3 (FGP: 76.0%, MGD: 8.0 days, GI: 5.2) for 24 h. When different temperature regimes and light periods are examined, the highest germination percentage was obtained at 20°C under photoperiod and continuous darkness conditions (88.0% and 76.5%, respectively).

Key words: dormancy, germination test, gibberellic acid, photoperiod, stratification



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