Akademik Veri Yönetim Sistemi
Journal of Environmental Biology, cilt.38, sa.1, ss.1-6, 2017 (SCI-Expanded, Scopus)
Aim: The objective of this study was to determine seasonal changes in tissue water relations and total soluble sugars in Cilician fir (Abies cilicica subsp. isaurica) seedlings in relation to physiological processes, and their relationship during bud dormancy and its release. Methodology: The water relations parameters, including osmotic potential at full turgor (Ψπ100) osmotic potential at the turgor loss point (Ψπ100), 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 (FWCCT) 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 otherwater relation parameters did not show any change. The osmotic potential atfull turgorand 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 firseedlings.