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 × 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 (≤ 50 ppm copper or ≤ 400 ppm zinc). The maximum quantum yield of PSII (Fv/Fm) and the maximum primary yield of PSII (Fv/Fo) decreased with increasing copper or zinc levels. Under high copper levels, the decline in Fv/Fm was caused only by the decline in Fm, and was accompanied by an increase in non-photochemical quenching (NPQ). The Fv/Fm declined under high levels of zinc due to both a decrease in the maximum fluorescence (Fm) and an increase in the initial fluorescence (Fo), 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.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 공시작물
  2.2. 구리와 아연 내성 작물의 선발
  2.3. 수수-수단그라스 교잡종 유식물체 생육 시 구리와아연의 영향
  2.4. 광계II 활성 분석
  2.5. 엽록소 및 카로티노이드 함량의 분석
  2.6. 식물체 내 중금속 축적량의 분석
  2.7. 통계분석
 3. 결과 및 고찰
  3.1. 구리와 아연 내성 작물의 선발
  3.2. 수수-수단그라스 교잡종 유식물체 생육시 구리와아연의 영향
  3.3. 수수-수단그라스 교잡종 유식물체의 엽록소형광반응에 미치는 구리와 아연의 영향
  3.4. 수수-수단그라스 교잡종 체내 구리와 아연의 축적
 4. 결 론
 REFERENCE

• 오순자(제주대학교 생물학과,기초과학연구소) | Soon-Ja Oh (Department of Biology & Research Institute for Basic Sciences, Jeju National University)
• 고석찬(농촌진흥청 국립원예특작과학원 온난화대응농업연구소) | Seok-Chan Koh (Agricultural Research Institute for Climate Change, RDA,) Corresponding author