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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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    Abstract - Issue Jan 2017, 38 (1)                                     Back


nstantaneous and historical temperature effects on a-pinene

Studies on tissue water relations and soluble sugars in

Cilician Fir (Abies cilicica) seedlings during bud dormancy

 

Ayse Deligoz*  and Merve Gur

Department of Forest Engineering, Faculty of Forestry, Suleyman Demirel University, 32260 Isparta, Turkey

*Corresponding Author E-mail: aysedeligoz@sdu.edu.tr

 

 

Key words

Bud dormancy,

Cilician Fir,

Osmotic adjustment,

Water potential

 

 

 

Publication Data

Paper received : 30.05.2015

Revised received : 01.12.2015

Re-revised received : 16.05.2016

Accepted : 09.06.2016

 

Abstract

Aims: The objective of this study was to determine seasonal changes in tissue water relations and total soluble sugars in Cilician fir (Abiescilicica subsp. isaurica) seedlings in relation to physiological processes, and their relationship during the bud dormancy and its release.

 

Methodology: The water relations parameters, including osmotic potential at full turgor (Yp100), osmotic potential at the turgor loss point (YpTLP), symplastic water at saturated point per dry weight of the shoot (Vo/DW), dry weight fraction (DWF), relative water content at the turgor loss point (RWCZT), free water content at the turgor loss point (FWCZT) were obtained from the pressure-volume curves. Total soluble sugar content was determined by the phenol-sulfuric acid method, while dormancy intensity was estimated as number of days to reach the budbreak.

 

Results: The osmotic potential at full turgor and turgor loss point were lowest in January (-3.34 and - 2.02 MPa, respectively) and highest in April (-2.27 and -1.26 MPa, respectively), and varied within season. The other water relation parameters did not show any change. The osmotic potential at full turgor and turgor loss point declined with the decrease of temperature during autumn and winter, and increased during dormancy release in spring. Total soluble sugars ranged between 103.8 and 224.0 mg g-1 and it declined rapidly with shoot development in spring.

 

Interpretation: This study showed that osmotic adjustment is an important physiological adaptive mechanism to tolerance low temperatures or unfavorable conditions during winter in Cilician fir seedlings. 

 

 

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