Seed physiology of four African Romulea species
Romulea diversiformis, R. flava, R. monadelpha and R. rosea are potential new ornamental crops. No literature has been published so far on the germination physiology of these species. To investigate the physical properties of the seeds of these species, imbibition rate, moisture content and viability of seeds were determined. To determine the optimum seed germination conditions, the effect of acid and mechanical (sand paper) scarification, plant growth promoting substances, deficiency of nitrogen, phosphorous and potassium, cold and warm stratification, temperature and light were examined. Experiments revealed that R. diversiformis and R. rosea seed germinate best at 10°C. R. flava showed the best germination when cold stratified (5°C) for 21 days. Dark conditions were favourable for R. monadelpha germination at 15°C. Seeds of R. diversiformis, R. flava and R. monadelpha may have non-deep endogenous morphophysiological dormancy.
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Document Type: Research Article
Publication date: July 1, 2011
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