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Adjustment of photosynthetic carbon assimilation to higher growth irradiance in three-year-old seedlings of two Tunisian provenances of Cork Oak (Quercus suber L.)

Touhami Rzigui (1-2)   , Jaouhra Cherif (3), Walid Zorrig (4), Abdelhamid Khaldi (1), Zouheir Nasr (1)

iForest - Biogeosciences and Forestry, Volume 10, Issue 3, Pages 618-624 (2017)
doi: https://doi.org/10.3832/ifor2105-010
Published: May 17, 2017 - Copyright © 2017 SISEF

Research Articles


Three-year-old seedlings of two Tunisian provenances of cork oak (Quercus suber L.) differing in climatic conditions at their geographical origin were subjected to increasing light intensities. Gaâfour was the provenance from the driest site and Feija from the wettest site. Low-light adapted seedlings from both provenances were exposed to two light treatments: full sunlight (HL) and low light (LL, 15% sunlight) for 40 days. The CO2-response curve of leaf net photosynthesis (An-Ci curve) established under saturated photon flux density was used to compare photosynthetic parameters between leaves subjected to continuous low light (LL leaves) and leaves transferred from low to high light (HL leaves). Transfer from low to high light significantly increased net photosynthesis (An) and dark respiration (Rd) in Gaâfour provenance but not in Feija. After transfer to high irradiance, specific leaf area (SLA) did not change in either provenance. This suggested that the increase in photosynthetic capacity on a leaf area basis in HL leaves of Gaâfour provenance was not due to increased leaf thickness. Only the seedlings from the Gaâfour provenance were able to acclimate to high light by increasing Vcmax and Jmax.

  Keywords


Quercus suber, Photosynthesis, Vcmax, Jmax, Stomatal Limitation

Authors’ address

(1)
Touhami Rzigui
Abdelhamid Khaldi
Zouheir Nasr
Laboratoire de Gestion et de Valorisation de Produits Forestiers (LGVPF), Institut National de Recherche en Génie Rural, Eaux et forêts (INRGREF, Tunisia)
(2)
Touhami Rzigui
Laboratoire des Ressources Sylvo-pastorales, Institut Sylvo-pastoral de Tabarka, Université de Jendouba (Tunisia)
(3)
Jaouhra Cherif
Laboratoire de Biophysique et Technologies Médicales, Institut Supérieur des Technologies Médicales de Tunis, Université de Tunis El-Manar (Tunisia)
(4)
Walid Zorrig
Laboratoire des Plantes Extrêmophiles (LPE), Centre de Biotechnologie de Borj Cédria (CBBC), BP 901, Hammam-Lif 2050 (Tunisia)

Corresponding author

 
Touhami Rzigui
rziguitouhami@gmail.com

Citation

Rzigui T, Cherif J, Zorrig W, Khaldi A, Nasr Z (2017). Adjustment of photosynthetic carbon assimilation to higher growth irradiance in three-year-old seedlings of two Tunisian provenances of Cork Oak (Quercus suber L.). iForest 10: 618-624. - doi: 10.3832/ifor2105-010

Academic Editor

Silvano Fares

Paper history

Received: May 07, 2016
Accepted: Mar 06, 2017

First online: May 17, 2017
Publication Date: Jun 30, 2017
Publication Time: 2.40 months

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