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The tolerance of growth and clonal propagation of Phragmites australis (common reeds) subjected to lead contamination under elevated CO₂ conditions

Zhang, Na, Lin, Jixiang, Yang, Yuheng, Li, Zhuolin, Wang, Ying, Cheng, Luyao, Shi, Yujie, Zhang, Yuting, Wang, Junfeng, Mu, Chunsheng
RSC advances 2015 v.5 no.68 pp. 55527-55535
Phragmites australis, biomass production, buds, carbon dioxide, carbon dioxide enrichment, lead, perennials, photosynthesis, phytomass, pollution, population growth, rhizomes, shoots, stomatal conductance
Phragmites australis is a rhizomatous perennial plant with extensive distribution and tolerance. To explore plant growth and clonal propagative tolerance to lead contamination under elevated CO₂, they were exposed to combinations of five Pb levels (0, 300, 500, 1500, 3000 mg kg⁻¹) and two CO₂ concentrations (380 ± 20 and 760 ± 20 μmol mol⁻¹) in phytotron. Biomass, photosynthetic parameters and rhizome growth were significantly inhibited, while number of axillary shoot buds and daughter apical rhizome shoots were increased by Pb additions. ∼80% of daughter shoots was from daughter axillary shoots, representing a phalanx growth pattern. Under elevated CO₂, photosynthetic parameters (excluding stomatal conductance and transpiration rate), growth of clonal modules were increased, facilitating plant biomass accumulation, phalanx growth and spreading strategy. The results suggest that elevated CO₂ might improve growth and clonal propagative resistance to Pb contamination through increasing photosynthetic, phalanx growth and population expansion of Phrgagmites australis.