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Differences in physiological and biochemical responses to summer drought of Pinus nigra subsp. pallasiana and Pinus brutia in a natural mixed stand

  • Ayşe DeligözEmail author
  • Fatma Gökçe Cankara
Original Paper
  • 38 Downloads

Abstract

Understanding how tree species respond to drought in their natural environment is needed to predict forest adaptation and management practices under global environmental changes. This study was carried out to determine and compare physiological and biochemical responses to variations in environmental conditions during summer drought of mixed natural stands of Pinus nigra Arn. subsp. pallasiana (Lamb.) Holmboe and Pinus brutia Ten. Midday xylem water potential (Ψmd), water relations, photosynthetic pigments, total soluble sugar and proline contents were investigated during the growing season. Ψmd followed a similar seasonal trend in both species but P. nigra subsp. pallasiana had higher Ψmd than P. brutia. The Ψmd gradually decreased from June, reached its lowest value in August, and then increased again. Gradual decreases in the osmotic potential at turgor loss point (ΨпTLP) were observed during the summer. Generally, ΨпTLP was lower in P. brutia. Total soluble sugars decreased from April to June for P. brutia, then increased and stayed relatively constant August to October. Similar changes were found at lower values in P. nigra subsp. pallasiana. Prolin accumulation and photosynthetic pigments were higher in P. brutia. The results indicate that physiological and biochemical responses of both species against changing environmental conditions were in different degrees but followed similar trends. P. nigra subsp. pallasiana is more sensitive to summer drought than P. brutia in their natural environment.

Keywords

Pinus nigra subsp. pallasiana Pinus brutia Osmotic potential Photosynthetic pigments Soluble sugars Proline Summer drought 

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Copyright information

© Northeast Forestry University 2019

Authors and Affiliations

  1. 1.Faculty of ForestryIsparta University of Applied SciencesIspartaTurkey

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