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The viability and germination capacity of verbena bonariensis and verbena rigida seeds


, : The viability and germination capacity of verbena bonariensis and verbena rigida seeds. Seed Science & Technology 8(4): 615-624

Seed viability was determined by the standard tetrazolium [TTC] producure and a modified tetrazolium method using a 0.3% INT [iodonitrotetrazolium] instead of a 1% TTC solution. This procedure demonstrated viability of about 87-95% although germination tests showed it to be low and inconsistent because of dormancy. Periodical germination tests indicated that loss of dormancy begins at 2 mo. after harvest. The germination capacity determined in this way during the 6 mo. of the experiment always fluctuated and was far beneath the real level. A temperature regime of 15.degree.-30.degree. C was optimal for germination of V. bonariensis, but for V. rigida 15.degree.-30.degree. C and 20.degree.-30.degree. C were both optimal. In most cases pre-chilling at 4.degree.-5.degree. C for 5-7 days, proved effective in overcoming dormancy in V. bonariensis. But in V. rigida the germination capacity remained far beneath maximu viability.

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