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Water relations, cuticular transpiration, and bud characteristics of air-slit containerized Picea glauca seedlings in response to controlled irrigation regimes

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White spruce seedlings (Picea glauca (Moench) Voss) were grown in air-slit containers (IPL 25-350A) in a tunnel under four different irrigation regimes (IR-15%, IR-30%, IR-45%, and IR-60%, v/v; (cm H2O)3·(cm substrate)–3). At the end of the first growing season the water-relation variables of the shoots were determined. Seedling morphology, the rates of cuticular transpiration and terminal bud development, as well as the number of needle primordia were also measured. Irrigation regime had no significant effect on any of the water-relation variables. Seedlings grown under the IR-15% were smaller and completed bud development more quickly than seedlings grown under IR-30%, IR-45%, and IR-60%. The formation of needle primordia was enhanced under IR-30%. Both the irrigation regime and the amount of time the detached shoots were left to transpire had a significant effect on the rate of cuticular transpiration. A comparison of the water-relation variables at the end of the first (1998) and second (1999) growing seasons showed that the younger seedlings had more negative osmotic potential at tissue saturation and greater maximum modulus of elasticity values. None of the other water-relation variables were significantly affected by seedling age, but the absolute values of all the variables were greater in the younger (1+0) seedlings.

Des semis d'épinette blanche (Picea glauca (Moench) Voss) (1+0), produits dans des récipients à parois ajourées ont été cultivés dans un tunnel sous quatre régies d'irrigation différentes (RI-15%, RI-30%, RI-45% et RI-60%, v/v; (cm H2O)3·(cm substrat)–3). À la fin de la première saison de croissance les caractéristiques hydriques des parties aériennes ont été déterminées. La morphologie des semis, le taux de transpiration cuticulaire, la cinétique de la formation des bourgeons apicaux et le nombre de primordia foliares ont aussi été mesurés. Aucune des variables hydriques n'a été significativement affectée par la régie d'irrigation. Les semis de la régie RI-15% étaient plus petits et ont complété la formation des bourgeons plus rapidement que les semis soumis aux autres régies d'irrigation. La formation de primordia foliares a été significativement augmentée sous la régie RI-30%. Le taux de transpiration cuticulaire a été influencé significativement par la régie d'irrigation et par le temps de dessiccation des pousses détachées. La comparaison des variables hydriques à la fin de la première (1998) et la deuxième saison de croissance (1999) a montré que les jeunes semis ont un potentiel osmotique à saturation plus négatif et des valeurs élevées du module d'élasticité. Aucune des autres variables hydriques n'a été significativement affectées par l'âge des semis, mais leurs valeurs absolues étaient plus grandes chez les jeunes semis (1+0).

Document Type: Research Article

Publication date: 2001-12-01

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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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