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Title

Effects of temperature and water deficit on cambial activity and woody ring features in Picea mariana saplings

Publication Year

2013

Author(s)
  • Balducci, Lorena
  • Deslauriers, Annie
  • Giovannelli, Alessio
  • Rossi, Sergio
  • Rathgeber, Cyrille B. K.
Source
TREE PHYSIOLOGY Volume: 33 Issue: 10 Pages: 1006-1017 Published: 2013
ISSN
0829-318X eISSN: 1758-4469
Abstract

Increase in temperature under the projected future climate change would affect tree growth, including the physiological mechanisms related to sapling responses, which has been examined recently. The study investigated the plant water relations, cambial activity and wood formation in black spruce saplings [Picea mariana (Mill.) B.S.P.] subjected to water deficit and warming. Four-year-old saplings growing in three greenhouses were submitted to different thermal conditions: T0, with a temperature equal to the external air temperature; and T + 2 and T + 5, with temperatures set at 2 and 5 K higher than T0, respectively. We also submitted saplings to two irrigation regimes and studied the effects of a water deficit of 32 days in May-June. We evaluated plant water relations, cambial activity, wood formation and anatomical characteristics from May to October 2010. Lower needle physiology rates were observed during water deficit, with 20-day suspension of irrigation, but after re-watering, non-irrigated saplings attained the same values as irrigated ones in all thermal conditions. Significant differences between irrigation regimes were detected in cambial activity at the end of the water deficit and after resumption of irrigation. Under warmer conditions, the recovery of non-irrigated saplings was slower than T0 and they needed from 2 to 4 weeks to completely restore cambial activity. No significant differences in wood anatomy were observed between irrigation regimes, but there was a sporadic effect on wood density under warming. During wood formation, the warmer conditions combined with water deficit increased sapling mortality by 5 and 12.2% for T + 2 and T + 5, respectively. The black spruce saplings that survived were more sensitive to water availability, and the restoration of cambial activity was slower at temperatures higher than T0. Our results suggest that black spruce showed a plastic response to intense water deficit under warming, but this would compromise their survival.

Author Keyword(s)
  • cambial activity
  • needle water relations
  • saplings
  • thermal conditions
  • water deficit
  • wood formation
KeyWord(s) Plus
  • BLACK SPRUCE SEEDLINGS
  • INTRAANNUAL DENSITY-FLUCTUATIONS
  • AIR-SLIT CONTAINERS
  • TREE MORTALITY
  • BALSAM FIR
  • NORWAY SPRUCE
  • EUCALYPTUS-PAUCIFLORA
  • CRYPTOMERIA-JAPONICA
  • DROUGHT RESPONSE
  • XYLEM PHENOLOGY
ESI Discipline(s)
  • Plant & Animal Science
Web of Science Category(ies)
  • Forestry
Adress(es)

[Balducci, Lorena; Deslauriers, Annie; Rossi, Sergio] Univ Quebec Chicoutimi, Dept Sci Fondament, Chicoutimi, PQ G7H 2B1, Canada; [Giovannelli, Alessio] IVaLSA CNR, Lab Xilogenesi, I-50019 Sesto Fiorentino, FI, Italy; [Rathgeber, Cyrille B. K.] Ctr INRA Nancy, INRA, Lab Etud Ressources Foret Bois LERFoB, F-54280 Champenoux, France

Reprint Adress

Balducci, L (reprint author), Univ Quebec Chicoutimi, Dept Sci Fondament, 555 Blvd Univ, Chicoutimi, PQ G7H 2B1, Canada.

Country(ies)
  • Canada
  • France
  • Italy
CNRS - Adress(es)

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Accession Number
WOS:000327460000002
uid:/RLPVNQ4R
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