Nitrogen fertilization promotes the phytoremediation of cadmium in Pentas lanceolata

The star cluster (Pentas lanceolata) cv. Butterfly was planted in a medium that contained 25 mg/kg cadmium (Cd) with application of varying nitrogen concentrations (0 mM, 8 mM, 16 mM, 24 mM and 32 mM) weekly. Regardless of whether nitrogen was applied, the length of stems, roots, the number of nodes...

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Published inInternational biodeterioration & biodegradation Vol. 85; pp. 709 - 714
Main Authors Chang, Yu-Sen, Chang, Yu-Jie, Lin, Chien-Tsan, Lee, Ming-Chih, Wu, Chun-Wei, Lai, Yun-Hui
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2013
Subjects
butterflies
Cadmium
chlorophyll
Chlorophylls
flowering
Heavy metal
landscapes
Leaves
nitrogen
nitrogen content
nitrogen fertilizers
Pentas lanceolata
Phytoremediation
planting
Plants (organisms)
Preserves
Roots
seedlings
Soil
Stems
Soil
Cadmium
Pentas lanceolata
Phytoremediation
Heavy metal
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Summary:The star cluster (Pentas lanceolata) cv. Butterfly was planted in a medium that contained 25 mg/kg cadmium (Cd) with application of varying nitrogen concentrations (0 mM, 8 mM, 16 mM, 24 mM and 32 mM) weekly. Regardless of whether nitrogen was applied, the length of stems, roots, the number of nodes, and thickness of leaves of the test seedlings were inhibited by the presence of Cd in the medium. Initially the Cd in the soil caused the chlorophyll meter readings (CMR) of plants to decrease to an abnormal level. The CMR values of the injured plants then recovered to normal levels after 28 days of 32 mM or 24 mM nitrogen addition (CMR levels 29.4 and 25.7 respectively), while the controls had a CMR of only 15.7. The 32 mM nitrogen treatment obtained the maximum accumulation of Cd concentration (622.9 mg/kg) in the root of the testing plants with a total Cd amount of 27.9 μg. Briefly, nitrogen treatment can improve the phytoremediation of Cd, also can promote the recovery of chlorophyll in leaves. Without inhibition of the flowering, the Pentas lanceolata could preserve their function in the landscape even during the process of phytoremediation. •Nitrogen facilitated the Cd uptake, and recover the chlorophyll in leaves.•Monitoring the CMR is useful for evaluating the recovery degree from the Cd stress.•Pentas lanceolata preserve their landscape function even during phytoremediation
Bibliography:http://dx.doi.org/10.1016/j.ibiod.2013.05.021
ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0964-8305
1879-0208
DOI:10.1016/j.ibiod.2013.05.021