Effects of Pb and Zn toxicity on chlorophyll fluorescence and biomass production of Koelreuteria paniculata and Zelkova schneideriana  young plants

X.H.  HUANG; F.  ZHU; W.D.  YAN; X.Y.  CHEN; G.J.  WANG; R.J.  WANG

doi:10.32615/ps.2019.050

Photosynthetica (May 2019)

Effects of Pb and Zn toxicity on chlorophyll fluorescence and biomass production of Koelreuteria paniculata and Zelkova schneideriana young plants

X.H. HUANG,
F. ZHU,
W.D. YAN,
X.Y. CHEN,
G.J. WANG,
R.J. WANG

Affiliations

X.H. HUANG: College of Life Science and Technology, Central South University of Forestry and Technology, 410004 Changsha, China National Engineering Laboratory for Applied Forest Ecological Technology in Southern China,
F. ZHU: College of Life Science and Technology, Central South University of Forestry and Technology, 410004 Changsha, China National Engineering Laboratory for Applied Forest Ecological Technology in Southern China,
W.D. YAN: College of Life Science and Technology, Central South University of Forestry and Technology, 410004 Changsha, China National Engineering Laboratory for Applied Forest Ecological Technology in Southern China,
X.Y. CHEN: 410004 Changsha, Hunan, China
G.J. WANG: College of Life Science and Technology, Central South University of Forestry and Technology, 410004 Changsha, China National Engineering Laboratory for Applied Forest Ecological Technology in Southern China,
R.J. WANG: 410004 Changsha, Hunan, China

DOI: https://doi.org/10.32615/ps.2019.050
Journal volume & issue: Vol. 57, no. 2
pp. 688 – 697

Abstract

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The influence of Pb and Zn on chlorophyll (Chl) fluorescence and plant growth of one-year-old Koelreuteria paniculata and Zelkova schneideriana young plants was investigated. Pb and Zn contents in plant organs were measured. The results showed Pb and Zn stress decreased photochemical quenching and quantum efficiency of PSII, but increased energy dissipation in the tested plants. At the same time, maximum net photosynthetic rate, maximum quantum use efficiency, and organ biomass were reduced. Under the same concentration of heavy metals, the damage induced by Zn toxicity was more serious than that of Pb. Pb was less accumulated in leaves, with a mild effect on photosynthesis. Zn was mostly accumulated in leaves and strongly disturbed chloroplast functioning and affected photosynthesis. Pb and Zn had different pathway to influence biomass production, and both tested plants might use different mechanisms of action for heavy metal stress resistance.

bioconcentration factor; pb toxicity; translocation factor; woody plant; zn toxicity.

Published in Photosynthetica

ISSN: 0300-3604 (Print); 1573-9058 (Online)
Publisher: Academy of Sciences of the Czech Republic, Institute of Experimental Botany
Country of publisher: Czechia
LCC subjects: Science: Botany
Website: https://ps.ueb.cas.cz/

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