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| Effects of Pb Stress on Growth and Pb Accumulation of Paspalum notatum |
| Received:August 08, 2014 |
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| KeyWord:Paspalum notatum;lead stress;growth index;root morphology;accumulation |
| Author Name | Affiliation | E-mail | | HOU Xiao-long | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | LIU Ai-qin | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | CAI Li-ping | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | fjclp@126.com | | ZHOU Chui-fan | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | WU Peng-fei | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZOU Xian-hua | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | MA Xiang-qing | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | |
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| Abstract: |
| Paspalum notatum is a saline- and drought-tolerant perennial grass and is often used as an erosion-controlling soil stabilizer. However, little information is available about its tolerance to Pb. Here we designed a pot experiments to examine the growth and metal content of Paspalum notatum under various Pb stress. The results showed that the maximum tolerance of P. notatum to Pb stress was 2500 mg·kg-1, but Pb stresses had inhibitory effects on plant growth and development. The inhibition was in order of tillering capacity > maximum leaf elongation > seedling height, and root volume > average root diameter > total root length > root surface area. In low Pb levels, plant biomass allocated more in the roots than in the aboveground; however, biomass accumulation in the aboveground increased with increasing Pb stress. Paspalum notatum accumulated Pb in root biomass, with relatively low Pb transfer. The maximum concentrations of Pb in roots and aboveground were 3 384.56 mg·kg-1 and 200.70 mg·kg-1, respectively. |
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