Growth and physiological response of fraser fir [Abies fraseri (Pursh) Poir.] seedlings to water stress: Seasonal and diurnal variations in photosynthetic pigments and carbohydrate concentration

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dc.contributor.authorKulaç, Şemsettin
dc.contributor.authorNzokou, Pascal
dc.contributor.authorGüney, Deniz
dc.contributor.authorCregg, Bert Michael
dc.contributor.authorTurna, İbrahim
dc.date.accessioned2020-04-30T13:32:32Z
dc.date.available2020-04-30T13:32:32Z
dc.date.issued2012
dc.departmentDÜ, Orman Fakültesi, Orman Mühendisliği Bölümüen_US
dc.description.abstractFour-year-old seedlings of Abies fraseri [(Pursh) Poir] (fraser fir) were grown in semicontrolled conditions in hoop houses with five watering regimes (0.00, 0.62, 1.25, 2.50, and 3.70 cm/week) with the goal of determining the seasonal variation in the physiological response to drought stress. Drought stress was monitored by measuring predawn (?pd) and midday (?md) potentials in a subset of plants from each treatment. Physiological variables monitored were chlorophyll fluorescence (Fv/Fm), Chl a, Chl b, total carotenes, and total carbohydrate concentrations. Morphological characteristics including height growth, root collar diameter, and terminal shoot growth were also measured. Predawn stem water potential values were generally higher (-0.8 to -1.9 Mpa) than midday values (-1.3 to -2.9 Mpa). Irrigation consistently increased ?pd and ?md compared with nonirrigated treatments. Photosynthetic pigments (Chl a, Chl b, and carotenes) decreased midseason (14 July) and increased toward the end of the season (25 Aug.) in predawn and midday measurements. There was a significant effect (P < 0.05) of drought stress on photosynthetic pigment concentrations in predawn and midday samples in the late-season measurements (25 Aug.). These results were accompanied with a similar significant difference in Fv/Fm between non-irrigated and irrigated trees. We concluded that significant effects observed on photosynthetic pigment concentrations in some of the treatments did not affect carbohydrate concentrations. Exposure of A. fraseri to water stress did not cause a reduction in supply of metabolic carbohydrates; consequently, the decline and mortality in water-stressed plants can only be the result of hydraulic failure caused by xylem cavitation leading to cessation of water flow in tissues, desiccation, and cellular death. Further studies are needed to confirm these preliminary conclusions.en_US
dc.identifier.endpage1519en_US
dc.identifier.issn0018-5345
dc.identifier.issue10en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage1512en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12684/334
dc.identifier.volume47en_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.relation.ispartofHortScienceen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleGrowth and physiological response of fraser fir [Abies fraseri (Pursh) Poir.] seedlings to water stress: Seasonal and diurnal variations in photosynthetic pigments and carbohydrate concentrationen_US
dc.typeArticleen_US

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