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

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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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