Soaking, moist-chilling, and temperature effects on germination of Acer pensylvanicum seeds

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Abstract:

The effect on germination of soaking duration, moist-chilling time, and temperature was evaluated using five seed lots of Acer pensylvanicum L. Seeds were soaked for 0, 48, 72, or 96 h, then moist chilled at 4 °C for 16, 24, or 32 weeks. Two temperature regimes were used for germination: (i) 16 h dark at 5 °C : 8 h light at 15 °C (5:15 °C) and (ii) 16 h dark at 20 °C : 8 h light at 30 °C (20:30 °C). Soaking and chilling seeds significantly increased germination. Germination was highest at 5:15 °C, but the germination speed was slow. Germination at 20:30 °C was lower, but 94%–98% of ungerminated seeds appeared to be viable, suggesting that they were dormant. Overall results showed that soaking seeds for 48 h, moist chilling for 16 weeks, and germinating at 5:15 °C produced an average germination of 92%.

L'effet du temps de trempage, de la durée d'exposition au froid humide et de la température sur la germination des graines a été évalué à l'aide de cinq lots de graines d'Acer pensylvanicum L. Les graines ont été mises à tremper pendant 0, 48, 72 ou 96 h et exposées ensuite au froid humide à 4 °C pendant 16, 24 ou 32 semaines. Deux régimes de température ont été utilisés pour la germination : (i) 16 h d'obscurité à 5 °C : 8 h de lumière à 15 °C (5:15 °C) et (ii) 16 h d'obscurité à 20 °C : 8 h de lumière à 30 °C (20:30 °C). Le trempage et l'exposition au froid ont significativement augmenté la germination des graines. Le taux de germination était maximal à 5:15 °C mais la vitesse de germination était lente. Le taux de germination était plus faible à 20:30 °C mais 94 % à 98 % des graines non germées semblaient viables; ce qui porte à croire qu'elles étaient dormantes. Dans l'ensemble, les résultats ont montré que le trempage des graines pendant 48 h, l'exposition au froid humide pendant 16 semaines et la germination à 5:15 °C produisent un taux de germination de 92 %.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: October 1, 2004

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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