Growth and turion formation of Potamogeton crispus in response to different phosphorus concentrations in water |
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Authors: | Lei Wang Tewu Yang Duanwei Zhu David Hamilton Zhongnan Nie Liangqing Liu Xiaoqiong Wan Congming Zhu |
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Institution: | 1. College of Plant Sciences and Technology, Huazhong Agricultural University, Wuhan, 430070, China 2. Laboratory of Plant Nutrition and Ecological Environment Research, Huazhong Agricultural University, Wuhan, 430070, China 3. Centre for Biodiversity and Ecology Research, University of Waikato, Private Bag 3105, Hamilton, 3240, New Zealand 4. Department of Primary Industries, Private Bag 105, Hamilton, VIC, 3300, Australia
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Abstract: | The vegetative growth and turion formation of Potamogeton crispus, a submersed aquatic macrophyte, was investigated under a range of phosphorus (P) concentrations (0.025, 0.25, 2.5 and 25 mg P L?1) in the ambient water free of algae, aiming to identify the responses of submersed aquatic macrophytes to nutrient enrichment, a common eutrophication problem in China and worldwide. Plant growth was not affected by different P concentrations in terms of biomass accumulation of stems and leaves. However, the contents of chlorophyll a and starch in plants decreased with increasing water P levels, whereas chlorophyll b and carotenoids declined with P level ranging from 0.025 to 2.5 mg P L?1. The soluble sugar content decreased when water P concentration increased up to 2.5 mg L?1. The P content in plants increased with increasing water P levels, whereas plant N content decreased and soluble protein increased when water P concentration increased over 0.25 mg L?1, implying that P. crispus may have modified its metabolism to adapt to water P availability. When P concentration increased to 25 mg L?1, the number and dry matter production of turions per plant decreased significantly. Meanwhile, there was a significant reduction in turion weight and the accumulations of soluble sugar and starch in turion, when water P concentration was over 0.25 mg L?1. The results suggest that turion formation in P. crispus is sensitive to P concentration in the ambient water, and high P levels may lead to decreases in P. crispus populations due to the decline in turion production. |
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