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The effect of soil temperature and light on sprouting and rooting of root cuttings of hybrid aspen clones

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Root cuttings from five clones of hybrid aspen (Populus tremula L. × Populus tremuloides Michx.) obtained from 2-year-old stock plants were grown in a peat–sand mixture (soil) at four soil temperatures (18, 22, 26, and 30 °C). Half of the cuttings were grown in light and the rest in darkness. The root cuttings that were grown at the highest soil temperature sprouted and rooted significantly better than the cuttings grown at the lower temperatures. Light did not affect the sprouting of root cuttings but did have a negative effect on their rooting. Moreover, the clones varied significantly in sprouting and rooting percentages, as well as in the time required for sprouting. In general, higher soil temperatures hastened sprouting of the cuttings. Sprouting was also faster in the light than in the dark treatment. Differences in soil temperature, light conditions, or clone had no significant effect on rooting time.

Des boutures de racines de cinq clones de peuplier hybride (Populus tremula L. × Populus tremuloides Michx.) récoltées sur des plantes-mères âgées de 2 ans ont été cultivées à quatre températures du sol différentes (18, 22, 26 et 30 °C). La moitié des boutures ont été cultivées en présence de lumière et le reste à la noirceur dans un mélange de tourbe et de sable. Les boutures cultivées à la température du sol la plus élevée ont produit des rejets et se sont enracinées significativement mieux que les boutures cultivées aux températures plus basses. La lumière n'a pas affecté la production de rejets par les boutures mais a eu un effet négatif sur leur enracinement. De plus, la production de rejets, l'enracinement ainsi que le temps requis pour produire des rejets étaient significativement différents selon le clone. Les températures du sol plus élevées accéléraient généralement la production de rejets. La production de rejets était également plus rapide en présence de lumière qu'à la noirceur. La température du sol, les conditions de lumière ou les différents clones n'ont pas eu d'effet significatif sur le temps d'enracinement des boutures.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2005-11-01

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