Mechanisms of Dormancy in Cold-Stored Juniperus Procera (Hochst. Ex. Endl.) Seeds

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A laboratory investigation was carried out to determine the operating mechanism of dormancy in cold' stored Juniperus procera seeds. Three seed pre-sowing treatments were applied to break dormancy in various parts of the seeds which were subsequently tested for germination. Embryos of the seeds expressed full germination both with and without the treatments precluding the existence of any form of embryo dormancy. Whole seeds also exhibited a fair percentage of germination but embryos surrounded by megagametophyte tissues showed very poor germination both with and without the treatments. This study concludes that the best pre-sowing treatment for J. procera is physical scarification by nicking of part of the seed coat. This however could be a very tedious practice especially where several thousands of seeds have to be treated and considering the small size of J. procera seeds. It is suggested that further trials be carried out to develop a cheap and appropriate presowing treatment for J. procera seeds to facilitate large-scale seedling production of this species. Considering various target tissues for their contribution to dormancy, the following summary (Table V) could represent the situation in this study.
East African Agricultural And Forestry Journal, 61 (No. 2), p. 155-159