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Effects of KNO3 pretreatment and temperature on seed germination of Sorbus pohuashanensis

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Abstract

We characterized the effects of KNO3 pretreatment and germination temperature on dormancy breaking and germination of mature mountain ash seeds. Seeds treated with KNO3 and germinated at 25 °C followed by 5 °C had significantly higher germination percentages and germination potentials (51% and 49%, respectively), compared with controls. These treated seeds also exhibited reduced germination initiation times (minimum of 48 days), and elevated germination rate indices (up to 97). The germination of seeds subjected to long-term cold storage (2 years at 0–5 °C) was also significantly improved by 3 days of 4% KNO3 pretreatment before germinating under a variable temperature regimen (5 °C followed by 25 °C, and followed by 5 °C). Germination percentages and germination potentials for these cold-stored seeds reached 67% and 54%, respectively, and the germination rate index increased to 126.99. Pretreatment of mountain ash seeds with KNO3 represents a practical, effective, and pollution-free method for improving germination, and can be implemented easily within a variety of nursery settings.

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Authors and Affiliations

  1. School of Forestry, Northeast Forestry University, Harbin, 150040, P. R. China

    Lei Bian, Ling Yang, Jian-an Wang & Hai-long Shen

  2. State Key Laboratory of Tree Genetics and Breeding, (Northeast Forestry University), Harbin, 150040, P. R. China

    Ling Yang & Hai-long Shen

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  1. Lei Bian
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  2. Ling Yang
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  3. Jian-an Wang
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  4. Hai-long Shen
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Correspondence to Ling Yang.

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Bian, L., Yang, L., Wang, Ja. et al. Effects of KNO3 pretreatment and temperature on seed germination of Sorbus pohuashanensis . Journal of Forestry Research 24, 309–316 (2013). https://doi.org/10.1007/s11676-013-0354-9

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  • DOI: https://doi.org/10.1007/s11676-013-0354-9

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