Breaking combinational dormancy in seeds of Chimonanthus praecox L.
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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