Copper and Zinc Uptake Capacity of a Sorghum-Sudangrass Hybrid Selected for in situ Phytoremediation of Soils Polluted by Heavy Metals

식물정화를 위한 중금속 내성 작물의 선발과 수수-수단그라스 교잡종의 구리와 아연 흡수능력

  • Oh, Soon-Ja (Agricultural Research Institute for Climate Change, RDA) ;
  • Koh, Seok-Chan (Department of Biology & Research Institute for Basic Sciences, Jeju National University)
  • 오순자 (농촌진흥청 국립원예특작과학원 온난화대응농업연구소) ;
  • 고석찬 (제주대학교 생물학과.기초과학연구소)
  • Received : 2015.10.05
  • Accepted : 2015.11.03
  • Published : 2015.11.30


As essential trace elements, copper and zinc play important roles in many physiological events in plants. In excess, however, these elements can limit plant growth. This study selected a heavy metal-tolerant plant by analyzing seed germination and biomass of alfalfa (Medicago sativa), canola (Brassica campestris subsp. napus var. nippo-oleifera), Chinese corn (Setaria italica), and a sorghum-sudangrass hybrid (Sorghum bicolor ${\times}$ S. sudanense), and determined heavy metal uptake capacity by analyzing biomass, chlorophyll a fluorescence, and heavy metal contents under high external copper or zinc levels. The seed germination rate and biomass of the sorghum-sudangrass hybrid were higher under copper or zinc stress compared to the other three plants. The plant biomass and photosynthetic pigment contents of the sorghum-sudangrass hybrid seedlings were less vulnerable under low levels of heavy metals (${\leq}50ppm$ copper or ${\leq}400ppm$ zinc). The maximum quantum yield of PSII ($F_v/F_m$) and the maximum primary yield of PSII ($F_v/F_o$) decreased with increasing copper or zinc levels. Under high copper levels, the decline in $F_v/F_m$ was caused only by the decline in $F_m$, and was accompanied by an increase in non-photochemical quenching (NPQ). The $F_v/F_m$ declined under high levels of zinc due to both a decrease in the maximum fluorescence ($F_m$) and an increase in the initial fluorescence ($F_o$), and this was accompanied by a marked decrease in photochemical quenching (qP), but not by an increase in NPQ. Accumulations of copper and zinc were found in both aboveand below-ground parts of plants, but were greater in the below-ground parts. The uptake capacity of the sorghum-sudangrass hybrid for copper and zinc reached 4459.1 mg/kg under 400 ppm copper and 9028.5 mg/kg under 1600 ppm zinc. Our results indicate that the sorghum-sudangrass hybrid contributes to the in situ phytoremediation of copper or zinc polluted soils due to its high biomass yield.


Supported by : 제주녹색환경지원센터


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