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Free Content Dry after-ripening, light, cold stratification and temperature effects on seed germination of Primula poissonii from Yunnan, China

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Primula poissonii, an attractive wild plant growing in the subalpine/alpine region of southwest China, has low seed germination in cultivation. This study attempted to improve seed germination by testing the effect of several treatments including dry after-ripening (DAR), light, cold stratification (CS) and temperature gradient treatments. DAR increased germination at 15/5 and 25/15°C, as compared with fresh seeds. DAR seeds germinated significantly better (> 80%) at higher temperatures (20-28°C) than at lower (10°C, < 20%; 15°C, < 30%) and extreme high temperatures (30°C, < 55%; 32°C, 0%). Incubation at alternating temperature (25/15°C) did not significantly improve germination; whereas at 15/5°C germination increased significantly, compared with the corresponding constant temperature (20 and 10°C, respectively). DAR seeds had a strict light requirement at all temperatures. As DAR and CS are sufficient to break seed dormancy, the seeds of P. poissonii appear to have non-deep PD. For non-dormant cold-stratified seeds, the estimated T b and thermal time ( 50) were 2.3°C and 74.1°Cd, respectively.

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Keywords: ALPINE PLANT; ALTERNATING TEMPERATURE; GERMINATION; LIGHT REQUIREMENT; SEED DORMANCY

Document Type: Research Article

Publication date: December 1, 2019

This article was made available online on October 15, 2019 as a Fast Track article with title: "Dry after-ripening, light, cold stratification and temperature effects on seed germination of Primula poissonii from Yunnan, China".

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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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