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| Effects of Heterogeneous Pb Stress on Root Growth and Biomass Allocation of Pogonatherum crinitum |
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| KeyWord:Pogonatherum crinitum; heterogeneous Pb stress; root morphology; biomass allocation |
| Author Name | Affiliation | | 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 | | 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: |
| Heavy metals usually distribute heterogeneously in the real environment. A controlled glasshouse experiment was conducted to explore the effects of heterogeneous Pb stress on root growth and biomass allocation of Pogonatherum crinitum, a Pb hyperaccumulator first found by our research group. There were 6 heterogeneous Pb stress treatments with 5 replicates. The root length, root volume, root surface area, average root diameter and plant biomass were examined. Root length, root volume and root surface area but not root diameter were significantly influenced by Pb stress. The root length, root volume and surface area of Pogonatherum crinitum increased gradually with Pb concentrations in both Pb stress and no Pb patches, with greater increases in the later than in the former. The root-shoot ratio initially increased and then decreased as Pb concentrations increased, indicating that Pogonatherum crinitum allocated more biomass to the roots under low Pb stress , but more to the shoots under high Pb stress. |
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