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Evaluation of drought response of two poplar clones (Populus x canadensis Mönch 'I-214' and P. deltoides Marsh. 'Dvina') through high resolution analysis of stem growth

Giovannelli Alessio, Deslauriers Annie, Fragnelli Giuseppe, Scaletti Luciano, Castro Gaetano, Rossi Sergio et Crivellaro Alan. (2007). Evaluation of drought response of two poplar clones (Populus x canadensis Mönch 'I-214' and P. deltoides Marsh. 'Dvina') through high resolution analysis of stem growth. Journal of Experimental Botany, 58, (10), p. 2673-2683.

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Different irrigation effects on stem radius variation (ΔR) and maximum daily shrinkage (MDS) in Populus deltoides 'Dvina' and Populus×canadensis 'I-214' were studied to assess differences in drought tolerance between clones. One-year-old trees growing in concrete tanks were submitted to two irrigation regimes (natural rainfall and irrigation) from 24 June to 10 August, and ΔR was monitored by automatic point dendrometers. Independently of the irrigation regime, 'Dvina' showed a higher stem radial increment than 'I-214'. In both clones, the first response to changed soil water content was a significant increase in MDS, whilst ΔR decreased about 20 d later when pre-dawn leaf water potential (Ψpd) dropped below -0.4 MPa. However, they displayed different strategies to overcome drought. 'Dvina' maintained a positive ΔR for longer than 'I-214', which had lower leaf Ψpd and greater leaf abscission at the end of the drought period. After irrigation resumed, 'Dvina' showed a higher capacity to restore stem growth. 'I-214' was probably unable to recover secondary growth because of higher leaf abscission during drought stress and the production of newly expanded leaves during recovery. It is concluded that the larger radial growth of 'Dvina' derived from a better water use (carbon uptake versus water loss) than 'I-214' under limited water availability.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:00220957 (ISSN)
Pages:p. 2673-2683
Version évaluée par les pairs:Oui
Sujets:Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:dendrometer, drought tolerance, fast-growing species, hybrid poplars, maximum daily shrinkage, radial growth
Déposé le:07 févr. 2017 02:34
Dernière modification:07 févr. 2017 02:34
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