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Breaking combinational dormancy in seeds of Chimonanthus praecox L.

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Freshly harvested seeds of Chimonanthus praecox had high viability (97%) but were dormant. Scarification accelerated seed water uptake, but it did not fully eliminate dormancy. Dry storage at room temperature for six months, warm plus cold dry storage (20°C for 12 weeks plus 5°C for 8 weeks) and cold (5°C) stratification broke dormancy and allowed germination of over 90% at 23°C. Although fresh seeds positively responded to GA3 solutions, the highest germination achieved was only 53% at 400 mg/L GA3 Germination was always greater at 23°C than at 20/10°C or 15°C. The results indicated that in natural conditions, this non-deep physiological dormancy and the restraint of the seed coat are important factors that delay the germination of C. praecox seeds. In practice, cold stratification (5°C for 12 weeks) was the quickest of the methods used to break dormancy in this species.
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Document Type: Research Article

Publication date: October 1, 2010

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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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