Observation on potential of various treatment options to ovrcome the inhibition of germination in Tagasaste (Chamaecytisus palmensis)
1998
Getnet Asefa (IAR, Addis Abeba (Ethiopia))
Untreated tagasaste seeds usually germinate at low rates (2-5 percent) and slowly as a result of dormancy due to impermeable hard seed coat. Wet heat using boiling water, dry heat using an oven temperatures of 45, 55, 65, 75, 85 and 105 degree centigrade, hot plate, and sand paper scarification of tagasaste seed for differnet length of time were tested to break dormancy of Tagasate. Germination trial of treated seeds was conducted at Holetta research centre in randomized block design. Soil media under field condition and bloating paper media in the laboratory at room temperature were used for germination. Scarification improved germination significantly while boiling water treatment for 7-11 minutes resulted up to 75 percent germination. Dry heat treatment up to 85 degree centigrade and sand paper scarification gave germination up to 40 percent and dry heat treatment at 105 degree centegrade even for shorter perods, 1 hour and hot plat treatments (half a minute) resulted in complete loss of viability.
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