Relation between drought-exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in Norway spruce seedlings
Ten five-year-old seedlings of Norway spruce (Picea abies L. Karst) from the Western Carpathians were subjected to drought (30 days without irrigation) in laboratory conditions (D trees). The control group (C trees) were irrigated regularly. Parameters such as stem diameter variations (SDV), soil wa...
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Sciendo
2025-07-01
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| Series: | Folia Oecologica |
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| Online Access: | https://doi.org/10.2478/foecol-2025-0013 |
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| author | Ayaz Sajad Muhammad Húdoková Hana Jamnická Gabriela Fleischer Peter Ditmarová Ľubica Razzak Abdul Ježík Marek |
| author_facet | Ayaz Sajad Muhammad Húdoková Hana Jamnická Gabriela Fleischer Peter Ditmarová Ľubica Razzak Abdul Ježík Marek |
| author_sort | Ayaz Sajad Muhammad |
| collection | DOAJ |
| description | Ten five-year-old seedlings of Norway spruce (Picea abies L. Karst) from the Western Carpathians were subjected to drought (30 days without irrigation) in laboratory conditions (D trees). The control group (C trees) were irrigated regularly. Parameters such as stem diameter variations (SDV), soil water potential (ΨS), gas exchange and chlorophyll a fluorescence were measured. Stem growth of D trees was significantly reduced below ΨS = –0.3 MPa, and completely stopped below ΨS = –1.1 MPa. Tree water deficit (TWD, calculated from SDV) of D trees started to increase substantially below the threshold ΨS = –0.9 MPa, and closely correlated with ΨS. Photosynthetic traits of D trees reacted synchronously with TWD during drought, and recovered after rehydration. Gas exchange and most of the chlorophyll a fluorescence parameters were tightly positively related to TWD. Growth and TWD parameters, as well as those of gas exchange and most of the chlorophyll a fluorescence parameters differed against C trees during drought. Thus, the parameters derived from SDV may serve as indicators of the functionality of photosynthetic apparatus. |
| format | Article |
| id | doaj-art-78d6a52e3c0b4d99a3687ccf661b2d40 |
| institution | DOAJ |
| issn | 1338-7014 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Sciendo |
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| series | Folia Oecologica |
| spelling | doaj-art-78d6a52e3c0b4d99a3687ccf661b2d402025-08-20T02:48:43ZengSciendoFolia Oecologica1338-70142025-07-0152212413810.2478/foecol-2025-0013Relation between drought-exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in Norway spruce seedlingsAyaz Sajad Muhammad0Húdoková Hana1Jamnická Gabriela2Fleischer Peter3Ditmarová Ľubica4Razzak Abdul5Ježík Marek61Institute of Forest Ecology, Department of Plant Ecophysiology, Slovak Academy of Sciences, Ľ. Štúra 2, 960 01, Zvolen, Slovakia1Institute of Forest Ecology, Department of Plant Ecophysiology, Slovak Academy of Sciences, Ľ. Štúra 2, 960 01, Zvolen, Slovakia1Institute of Forest Ecology, Department of Plant Ecophysiology, Slovak Academy of Sciences, Ľ. Štúra 2, 960 01, Zvolen, Slovakia2Faculty of Forestry, Technical University in Zvolen, TG Masaryka 24, 960 01, Zvolen, Slovakia1Institute of Forest Ecology, Department of Plant Ecophysiology, Slovak Academy of Sciences, Ľ. Štúra 2, 960 01, Zvolen, Slovakia1Institute of Forest Ecology, Department of Plant Ecophysiology, Slovak Academy of Sciences, Ľ. Štúra 2, 960 01, Zvolen, Slovakia1Institute of Forest Ecology, Department of Plant Ecophysiology, Slovak Academy of Sciences, Ľ. Štúra 2, 960 01, Zvolen, SlovakiaTen five-year-old seedlings of Norway spruce (Picea abies L. Karst) from the Western Carpathians were subjected to drought (30 days without irrigation) in laboratory conditions (D trees). The control group (C trees) were irrigated regularly. Parameters such as stem diameter variations (SDV), soil water potential (ΨS), gas exchange and chlorophyll a fluorescence were measured. Stem growth of D trees was significantly reduced below ΨS = –0.3 MPa, and completely stopped below ΨS = –1.1 MPa. Tree water deficit (TWD, calculated from SDV) of D trees started to increase substantially below the threshold ΨS = –0.9 MPa, and closely correlated with ΨS. Photosynthetic traits of D trees reacted synchronously with TWD during drought, and recovered after rehydration. Gas exchange and most of the chlorophyll a fluorescence parameters were tightly positively related to TWD. Growth and TWD parameters, as well as those of gas exchange and most of the chlorophyll a fluorescence parameters differed against C trees during drought. Thus, the parameters derived from SDV may serve as indicators of the functionality of photosynthetic apparatus.https://doi.org/10.2478/foecol-2025-0013chlorophyll a fluorescencedendrometersphotosynthesispicea abieswater scarcity |
| spellingShingle | Ayaz Sajad Muhammad Húdoková Hana Jamnická Gabriela Fleischer Peter Ditmarová Ľubica Razzak Abdul Ježík Marek Relation between drought-exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in Norway spruce seedlings Folia Oecologica chlorophyll a fluorescence dendrometers photosynthesis picea abies water scarcity |
| title | Relation between drought-exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in Norway spruce seedlings |
| title_full | Relation between drought-exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in Norway spruce seedlings |
| title_fullStr | Relation between drought-exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in Norway spruce seedlings |
| title_full_unstemmed | Relation between drought-exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in Norway spruce seedlings |
| title_short | Relation between drought-exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in Norway spruce seedlings |
| title_sort | relation between drought exposed photosynthetic apparatus and tree water deficit derived from stem diameter variations in norway spruce seedlings |
| topic | chlorophyll a fluorescence dendrometers photosynthesis picea abies water scarcity |
| url | https://doi.org/10.2478/foecol-2025-0013 |
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