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

PeerJ

article

Na Zhang¹  Jinwei Zhang³  Zhiqiang Li⁴  Jing Chen²  Zhenhua Zhang¹  Chunsheng Mu³ 

[1] Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences;Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Huaiyin Institute of Technology;Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University;Academy of Climate Change and Public Policy, Nanjing University of Information Science and Technology

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

DOI  :  10.7717/peerj.4188

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 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∼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 of the 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 of buds, 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.

【 授权许可】

CC BY