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Seasonal fluctuation of root carbohydrates in hybrid aspen clones and its relationship to the sprouting efficiency of root cuttings

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We examined the relationship between root carbohydrates and sprouting efficiency in four hybrid aspen (Populus tremula × Populus tremuloides) clones. Our hypothesis was that the interclonal variation in sprouting efficiency is due to the concentration of carbohydrates. In addition to that relationship, we wanted to study seasonal fluctuation of carbohydrates and how the–18°C storage conditions of stock plants affects the stability of carbohydrate content and thus sprouting ability of roots cuttings. Clones varied in root carbohydrate content, and sucrose showed the greatest variation throughout the year. Sucrose levels were highest in the clone with the highest sprouting efficiency and lowest in the clone with the lowest sprouting efficiency. Carbohydrate concentrations were highest in winter and lowest in early autumn. In general, root cuttings sprouted most efficiently when root carbohydrate levels peaked. Although root cuttings taken from frozen (–18°C) stock plants sprouted poorly in summer and autumn, they had high and almost constant carbohydrate concentrations throughout the year.

Nous avons étudié la relation entre les hydrates de carbone dans les racines et l’efficacité du drageonnement chez quatre clones de peuplier hybride (Populus tremula × Populus tremuloides). Nous avons émis l’hypothèse selon laquelle la variation interclonale de l’efficacité du drageonnement serait due à la concentration des hydrates de carbone. En plus de cette relation, nous voulions étudier la fluctuation saisonnière des hydrates de carbone et la façon dont les conditions d’entreposage à –18 °C des plantes-mères influencent la stabilité de la teneur en hydrates de carbone et, par conséquent, la capacité des boutures de racine à drageonner. La teneur en hydrates de carbone des racines variait selon le clone et le sucrose a connu la plus forte variation tout au long de l’année. Le niveau de sucrose était le plus élevé chez le clone qui drageonnait le plus efficacement et le plus faible chez le clone qui produisait le moins de drageons. La concentration des hydrates de carbone était la plus élevée en hiver et la plus faible au début de l’automne. En général, les boutures de racine drageonnaient le plus efficacement lorsque le niveau d’hydrates de carbone culminait. Bien que les boutures de racine prélevées sur des plantes-mères gelées (–18 °C) n’aient pas bien drageonné en été et à l’automne, elles avaient des concentrations élevées et presque constantes d’hydrates de carbone pendant toute l’année.

Document Type: Research Article

Publication date: August 1, 2009

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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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