Response to drought of Zn-stressed Quercus suber L. seedlings |
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| Institution: | 1. Department de Ecología – Instituto Multidisciplinar para el Estudio del Medio “Ramon Margalef” (IMEM), Universidad de Alicante, Ap 99, 03080 Alicante, Spain;2. Fundación Centro de Estudios Ambientales del Mediterráneo CEAM, Universidad de Alicante, Ap 99, 03080 Alicante, Spain;1. Bally Technologies Inc., 6650 S. El Camino Road, Las Vegas, NV 89118, USA;2. University of Nevada, Las Vegas, 4505 Maryland Parkway, Box 454026, Las Vegas, NV 89154-4026, USA;3. Desert Research Institute (DRI), 755 E. Flamingo Road, Las Vegas, NV 89119, USA;1. Poznań University of Life Sciences, Department of Chemistry, Wojska Polskiego 75, 60-625, Poznań, Poland;2. Adam Mickiewicz University in Poznań, Department of Genome Biology, Institute of Molecular Biology and Biotechnology, Umultowska 89, 61-614, Poznań, Poland;3. Poznań University of Life Sciences, Department of Mathematical and Statistical Methods, Wojska Polskiego 28, 60-637, Poznań, Poland;4. Institute of Chemical Wood Technology, Wojska Polskiego 38/42, 60-637, Poznań, Poland;5. Adam Mickiewicz University in Poznań, Department of Analytical Chemistry, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland;1. Laboratory of Biochemistry and Environmental Toxicology, ISA, Chott-Meriem, Sousse, Tunisia;2. Regional Research Centre in Horticulture and Organic Agriculture, Chott-Mariem, Sousse, Tunisia;3. Laboratory of Water Environment and Urban systems, University Paris-Est Créteil, Créteil Cedex, 94010, France;1. College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, China;2. College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China;3. Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou, 350002, China;4. Faculty of Forestry & Environmental Management, University of New Brunswick, Fredericton, E3B5A3, Canada |
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| Abstract: | Zinc is an essential nutrient for higher plants but it becomes toxic as its availability increases. In nature, different stress factors commonly occur concurrently, challenging our ability to predict their impacts. Information on zinc (Zn) effect on plant ability to withstand other sources of stress is scarce. This study examines the effect of zinc supply rate on the response of Quercus suber L. seedlings to water stress. Seedlings were treated with four levels of zinc from 3 to 150 μM, and then exposed to a short severe drought. Zinc concentration in leaves and roots increased with zinc availability. Maximum photosynthetic rate, photochemical efficiency, root length and specific root length decreased as Zn availability increased. The decrease was particularly intense between 50 and 150 μM Zn. The relative effects of drought were less intense in seedlings receiving higher doses of Zn than in those receiving 3 μM. Thus, at severe drought, relative water content of detached leaves decreased to 52% in seedlings receiving the lowest level of Zn. In contrast, relative water content remained above 70% in seedlings exposed to high concentrations of this metal. The pattern was similar for photosynthetic rate and stomatal conductance, as the decrease in these variables resulting from severe drought was 100% and 90% in seedlings receiving 3 μM and 65% and 56% in seedlings receiving the highest Zn dose. Our results suggest that morpho-physiological responses to zinc may foster water conservation strategies and alleviate the effects of drought in the short term, but they may impair seedling ability to root and grow in a longer term. |
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