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Resistance strategies of Phragmites australis (common reed) to Pb pollution in flood and drought conditions

文献类型： 外文期刊

作者： Zhang, Na 1 ; Zhang, Jinwei 3 ; Li, Zhiqiang 4 ; Chen, Jing 2 ; Zhang, Zhenhua 1 ; Mu, Chunsheng 3 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resource & Environm, Nanjing, Jiangsu, Peoples R China

2.Huaiyin Inst Technol, Key Lab Palygorskite Sci & Appl Technol Jiangsu Pr, Huaian, Peoples R China

3.Northeast Normal Univ, Inst Grassland Sci, Minist Educ, Key Lab Vegetat Ecol, Changchun, Jilin, Peoples R China

4.Nanjing Univ Informat Sci & Technol, Acad Climate Change & Publ Policy, Nanjing, Jiangsu, Peoples R China

关键词： Phragmites australis;Flooded treatment;Photosynthesis;Drought;Clonal growth;Biomass allocation

期刊名称：PEERJ （ 影响因子：2.984； 五年影响因子：3.369 ）

ISSN： 2167-8359

年卷期： 2018 年 6 卷

页码：

收录情况： SCI

摘要： Resistance strategies of clonal organs, and parent and offspring shoots of Phragmites australis (common reed) to heavy metal pollution in soils are not well known. To clarify the tolerance or resistance strategies in reeds, we conducted a pot experiment with five levels of Pb concentration (0 similar to 4,500 mg kg (-1)) in flood and drought conditions. Lead toxicity had no inhibitory effect on the number of offspring shoots in flood environment; however, biomass accumulation, and photosynthetic and clonal growth parameters were inhibited in both water environment. At each treatment of Pb concentration, offspring shoots had greater biomass and higher photosynthesis indicators than parent shoots. The lowest Pb allocation was found in rhizomes. More ofthe Pb transported to above-ground parts tended to accumulate in parent shoots rather than in offspring shoots. Biomass and photosynthesis of offspring shoots, rhizome length, and the number ofbuds, rhizomes and offspring shoots in the flooded treatment were significantly greater than those in the drought treatment. Our results indicated that the tolerance strategies used by reeds, including higher biomass accumulation and photosynthesis in offspring shoots, low allocation of Pb in rhizomes and offspring shoots, and stable clonal growth, maintained the stability of population propagation and productivity, improving the resistance of reeds to Pb pollution in flood environment. However, the resistance or tolerance was significantly reduced by the synergistic effect of Pb and drought, which significantly inhibited biomass accumulation, photosynthesis, and clonal growth of reeds.

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