Centre de documentation
scientifique

Drought susceptibility and recovery of transplanted Quercus rubra seedlings in relation to root system morphology / Douglass F. Jacobs in Annals of Forest Science, Vol 66 n° 5 (July - August 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 5 (July - August 2009) . - n° 504 Titre : Drought susceptibility and recovery of transplanted Quercus rubra seedlings in relation to root system morphology Titre original : Sensibilité à la sécheresse et reprise des semis transplantés de Quercus rubra en relation avec la morphologie racinaire Type de document : Article/Communication Auteurs : Douglass F. Jacobs, Auteur ; K. Francis Salifu, Auteur ; Anthony S. David, Auteur Année de publication : 2009 Article en page(s) : n° 504 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] écophysiologie [Termes IGN] Quercus rubra [Termes IGN] semis (sylviculture) [Termes IGN] stress hydrique [Termes IGN] système radiculaire [Termes IGN] xylème Résumé : (auteur) Transplant shock, implicated by depressed seedling physiological status associated with moisture stress immediately following planting, limits early plantation establishment. Large root volume (Rv) has potential to alleviate transplant shock because of higher root growth potential and greater access to soil water. We investigated impacts of drought and transplant Rv on photosynthetic assimilation (A), transpiration (E), stomatal conductance (gs), predawn leaf xylem water potential (ΨL), and growth of northern red oak (Quercus rubra L.) seedlings to explain mechanisms associated with susceptibility to transplant shock. One year-old barerooot seedlings were graded into four Rv categories and either well watered or subjected to drought consisting of low, medium, or high moisture stress by discontinuing irrigation at 22-day intervals for 3 months. Thereafter, all treatments were re-watered to examine recovery. Transplant shock was signified by reduced A, E, gs, and ΨL, which generally increased with increasing moisture stress and Rv. Physiological status improved during recovery, though stress was still evident in seedlings exposed to medium or high moisture stress and in larger Rv seedlings. Growth declined with increasing moisture stress but was generally similar among Rv treatments, likely reflecting greater A at the whole plant level and/or reliance upon stored reserves in large Rv seedlings. The most effective drought avoidance mechanisms were root growth, stomatal regulation, reduced leaf area, and higher growth allocation to roots relative to shoots. Our results suggest that large initial Rv does not enhance drought avoidance during the first season after transplant in northern red oak seedlings. Numéro de notice : A2009-638 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009029 Date de publication en ligne : 09/07/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/05/f09040/f09040.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72462 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000455	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt