Waterlogging under simulated late-winter conditions had little impact on the physiology and growth of Norway spruce seedlings |
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Authors: | Ai-Fang Wang Marja Roitto Tarja Lehto Janusz J Zwiazek Mónica Calvo-Polanco Tapani Repo |
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Affiliation: | 1. The Finnish Forest Research Institute, Joensuu, P.O. Box 68, FI-80101, Joensuu, Finland 2. School of Forest Sciences, University of Eastern Finland, P.O. Box 111, FI-80101, Joensuu, Finland 3. Department of Renewable Resources, University of Alberta, 442 Earth Sciences Bldg., Edmonton, AB T6G 2E3, Canada 4. Department of Soil Microbiology and Symbiotic Systems, Estación Experimental del Zaidín (CSIC), Granada, 18008, Spain
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Abstract: | Context Waterlogging is predicted to become more common in boreal forests during winter and early spring with climate change. So far, little is known about the waterlogging tolerance of boreal tree species during their winter dormancy. Aim The aim was to quantify the degree of waterlogging tolerance of 1-year-old dormant Norway spruce (Picea abies (L.) Karst.) seedlings. Methods The seedlings were exposed to waterlogging in a growth chamber at temperature of 2 °C for 4 weeks and then allowed to recover for 6 weeks during the growth stage. Shoot and root responses were monitored by physiological and growth measurements. Results No effect was found in the seedling biomass, but root mortality increased slightly during the early growth stage following waterlogging. The water potential of the needles became less negative at the end of the waterlogging and the early growth stage. The ratio of apoplastic to symplastic electrical resistance (R e/R i) of the needles was lower after waterlogging, indicating changes in the proportions of symplastic and apoplastic space. No differences were found between the treatments in the dark-acclimated chlorophyll fluorescence (F v/F m) of the needles. Slightly greater accumulation of starch and temporary reductions of some mineral nutrients in needles were found after waterlogging. Conclusions We conclude that in late winter and early spring, Norway spruce seedlings potentially tolerate short periods of waterlogging. |
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