African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12278

Full Length Research Paper

Growth, ectomycorrhization and biochemical parameters of Quercus suber L. seedlings under drought conditions

Henia Daoudi*
  • Henia Daoudi*
  • Laboratoire d’Ecophysiologie Végétale, Département de Biologie, Faculté des Sciences Biologiques et des Sciences Agronomiques, Université Mouloud Mammeri, Tizi-Ouzou, 15000, Algeria.
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Arezki Derridj
  • Arezki Derridj
  • Laboratoire d’Ecophysiologie Végétale, Département de Biologie, Faculté des Sciences Biologiques et des Sciences Agronomiques, Université Mouloud Mammeri, Tizi-Ouzou, 15000, Algeria.
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Lynda Hannachi
  • Lynda Hannachi
  • Laboratoire d’Ecophysiologie Végétale, Département de Biologie, Faculté des Sciences Biologiques et des Sciences Agronomiques, Université Mouloud Mammeri, Tizi-Ouzou, 15000, Algeria.
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Jean Philippe Mevy
  • Jean Philippe Mevy
  • Aix-Marseille Université, Equipe Diversité et Fonctionnement, des Molécules aux Ecosystèmes. IMBE - UMR CNRS 7263 / IRD 237 - ST CHARLES - 3 Place Victor Hugo - 13003 Marseille cedex 3 France.
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  •  Received: 07 June 2016
  •  Accepted: 07 September 2016
  •  Published: 21 September 2016

Abstract

Drought conditions are the major constraint to the early establishment of Quercus suber species. However, drought responses of this species depend on provenances. The objective of this study was to obtain more comprehensive knowledge on the influence of drought conditions on the response of Q. suber L. seedlings originating from Algeria. Soil water status in soil (SWC) and relative water content (RWC) in leaves, morphological parameters for growth evaluation and physiological parameters, and ectomycorrhization were evaluated in two plots of seedlings: watered (W) and none watered (NW). Ten weeks of water starvation induced a reduction in RWC, ectomycorrhization rate and height and diameter growth of none watered seedlings. Under drought conditions, both soluble sugars and proteins were enhanced while polyphenols and %N decreased. The reduction of soil water content was negatively correlated with carbon isotope discrimination. The survival of the seedlings under these drought conditions was due to two strategies: osmotic adjustment through soluble sugars and proteins accumulations in leaves and an increase in carbon discrimination which enhances the water use efficiency (WUE).

Key words: Quercus suber, growth, drought, ectomycorrhization, pigments, sugars, starch, plyphenols, δ13C.