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Effects of various treatments on breaking seed dormancy of Astragalus siliquosus

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Seeds of Astragalus siliquosus Boiss. possess seed coat-imposed dormancy hampering complete, rapid and uniform germination. Several treatments including acid and mechanical scarification and stratification were applied to increase seed coat permeability. Results indicated that about 95% of seed dormancy is due to seed coat impermeability to water and the rest are related to physiological factors. Mechanical scarification by sandpaper was the most appropriate treatment to permeable the seed coat to water with no adverse effects on embryo. Using this treatment along with cold stratification removed more than 98% of seed dormancy. Also stratification of the imbibed seeds increased speed of germination significantly but had no considerable effects on fresh weight and dry weight of seedlings. Sulfuric acid, however, increased germination but had maximum percentage of dead seeds. Other treatments had not significant differences with control.
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Document Type: Research Article

Publication date: 01 October 2006

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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