newly found manganese hyperaccumulator—Polygonum lapathifolium Linn

• Published in: International journal of phytoremediation 2016-04, Vol.18 (4), p.348-353
• Main Authors: Liu, Kehui, Yu, Fangming, Chen, Menglin, Zhou, Zhenming, Chen, Chaoshu, Li, Ming shun, Zhu, Jing
• Format: Article
• Language: English
• Subjects: Biodegradation, Environmental; biomass; Environmental Restoration and Remediation - methods; enzyme activity; hyperaccumulation; hyperaccumulators; Laboratories; Leaves; Manganese; Manganese - analysis; Manganese - metabolism; Persicaria lapathifolia; phytoremediation; pigments; Plant Leaves - chemistry; Plant Leaves - growth & development; Plant Leaves - metabolism; Plant Roots - chemistry; Plant Roots - growth & development; Plant Roots - metabolism; Plants (organisms); Polygonum - chemistry; Polygonum - growth & development; Polygonum - metabolism; Polygonum lapathifolium; Polygonum lapathifolium L; Roots; Soil Pollutants - analysis; Soil Pollutants - metabolism; Stems; Stress concentration; Stresses; Tolerances; toxicity
• ISSN: 1549-7879; 1522-6514; 1549-7879
• DOI: 10.1080/15226514.2015.1109589

In the present work, both field investigation and laboratory experiment were carried out to testify whether Polygonum lapathifolium L. is a potential manganese (Mn) hyperaccumulator. Results from field investigation showed that P. lapathifolium had great tolerance and accumulation to Mn. Mn concentrations in leaves were the highest, varied from 6889.2 mg kg-1 dry weight (DW) to18841.7 mg kg ⁻¹ DW with the average of 12180.6 mg kg ⁻¹. The values of translocation factor (the concentrations of Mn in leaf to that in root) ranged from 5.72 to 9.53. Results from laboratory experiment illuminated that P. lapathifolium could grow well and show no toxic symptoms even under high Mn stress (16 mmol L ⁻¹). Although the changes of antioxidant enzymes activities were triggered under Mn stress, the alterations of pigments were not significant (P > 0.05) as compared with control. Total plant biomass and plant height increased with increasing Mn supply. Mn concentrations in leaves and stems were constantly greater than those in roots, the ratio of concentrations in leaves to that in roots were 2.58–6.72 and the corresponding values in stems to that in roots were 1.45–3.18. The results showed that P. lapathifolium is a Mn-hyperaccumulator.