Physiological response to drought in seedlings of Pistacia lentiscus (mastic tree)

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• 作者：A. R. Vasques ; G. Pinto ; M. C. Dias ; C. M. Correia ; J. M. Moutinho-Pereira…
• 关键词：Osmotic stress ; Polyethylene glycol ; Ecological restoration ; Resilience
• 刊名：New Forests
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：47
• 期：1
• 页码：119-130
• 全文大小：438 KB
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• 作者单位：A. R. Vasques (1)
  G. Pinto (2)
  M. C. Dias (2)
  C. M. Correia (3)
  J. M. Moutinho-Pereira (3)
  V. R. Vallejo (4) (5)
  C. Santos (2)
  J. J. Keizer (1)
  
  1. Department of Environment and Planning, Centre for Environmental and Marine Studies (CESAM), University of Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal
  2. Department of Biology, Centre for Environmental and Marine Studies (CESAM), University of Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal
  3. Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), University of Trás-os-Montes and Alto Douro, Apt. 1013, 5000-801, Vila Real, Portugal
  4. Department of Plant Biology, University of Barcelona, Diagonal, 643, 08028, Barcelona, Spain
  5. CEAM Foundation, Parque Tecnológico, Ch. Darwin 14, 46980, Paterna, Spain
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Forestry
  
• 出版者：Springer Netherlands
• ISSN：1573-5095

文摘

Drought is often an important constraint on plant regeneration in the Mediterranean. Pistacia lentiscus is of particular interest in restoration actions in fire-prone areas. This study addressed the current knowledge gap on the physiological response of this species to drought during its initial development. We hypothesized that the seedlings would have a high resistance to drought. In addition, we expected that seedlings from two sources with contrasting climate conditions would perform distinctly under drought. Seeds were collected from two populations in north and south Portugal. Seedlings were subjected to a progressively lower osmotic potential during 25 days, through increasing PEG concentration in the hydroponic solution. The physiological response of the seedlings was assessed by measuring gas exchange and chlorophyll fluorescence after 15 and 25 days of drought exposure, when the osmotic potential was −2.47 and −5.17 MPa, respectively. Shoot growth, net CO₂ assimilation rate, stomatal conductance and transpiration were significantly reduced under drought conditions, whilst intrinsic water-use efficiency (IWUE) remained unaffected. This response partially agreed with the known strategy of P. lentiscus to cope with drought, typically maintaining high IWUE, however the observed reduction in stomatal conductance was not as pronounced as expected. Drought induced a decrease in leaf pigments that could be linked to photo-protective mechanisms. Seed source did not have a significant effect on drought response. P. lentiscus showed a high resistance to drought, which clearly supported its use in restoration actions in the Mediterranean, but these findings require further testing under field conditions.