Saturday, 15 July 2006

Effects of Arbuscular Mycorrhizal Fungi Inoculation on Arsenic and Phosphorus Uptake by Trifolium repensin and Oenothera odorata Jacq. in Arsenic Contaminated Soil.

Dae-Yeon Kim1, Yun-Jeong Lee2, Nam-In Goo1, Jinho Jung1, and Jeong-Gyu Kim1. (1) Division of Environmental Science and Ecological Engineering, Korea Univ, AnamDong 5-1, SungbukGu, Seoul, South Korea, (2) National Institute of Agricultural Science and Technology, Seodun-dong 249 Kweonseon-Ku, Suwon, South Korea

Arbuscular mycorrhiza (AM) fungi which belongs to endomycorrhiza are the most widespread fungal form on earth. AM fungi obtain their carbon sources from the photosynthate of the host plants and host plants obtain phophorus by nutrient exchange with AM fungi. Arsenic is ubiquitous heavy metal in soil and nearly all other environmental media. Because arsenate behaves as an analogue of the macronutrient phosphate, the AM fungi associated plants may play an important role for arsenic uptake in arsenic contaminated soil. However, very few studies were conducted to elucidate arsenic and phosphorus uptake to wildlife grasses by interaction with AM fungi in arsenic contaminated soils. In this research, the effects of arbuscular mycorrhizal(AM) fungi(Glomus mosseae) inoculation on arsenic and phosphorus uptake by Trifolium repensin and Oenothera odorata Jacq. from arsenic contaminated soil were investigated by pot experiment in greenhouse for 8 weeks. The gold mine soil used in this experiment is polluted by 381.6 mg total As/kg and 20 mg available As/kg, selected plants, Trifolium repensin and Oenothera odorata Jacq., are widespread and largely distributing on abandoned metalliferous mine area in south-Korea. There were two treatments of AM fungi inoculation and sterile(control) of mine soil for both plants and each treatment has four replicates. After eight weeks, shoot dry weight and biomass of Trifolium repensin and Oenothera odorata Jacq. associated with AM fungi were 0.22, 0.29 g/plant and 7.9, 14.6g/pot. They were significantly higher value than that of control plants, 0.045, 0.124 g/plant and 1.8, 6.7g/pot grown in sterile media. No root colonization by AM fungi was detected in control plants grown in sterile media, while percent root colonization of AM fungi to Trifolium repensin and Oenothera odorata Jacq. was 55.91, 62.32. Arsenic and phosphorus uptake was shown similar pattern for both plants. Arsenic was mainly accumulated 234.6, 240.1 mg As/kg in root tissue of AM fungi associated Oenothera odorata Jacq. and Trifolium repensin, respectively. Generally arsenic resistant plants maintain their shoot phosphorus status high but the results of present studies showed phosphorus in root tissue of mycorrhizal plants was translocated to shoot tissue lower than that of non-mycorrhizal plants. It was inferred to alleviate arsenic toxicity by accumulating higher root phosphorus in both plants. From these results, inoculation of AM fungi to host plants obtained high yield and increase arsenic resistance to its toxicity and has a potential applicability to enhance the efficiency of phytostabilization in soils highly contaminated with arsenic. Keywords: Phytoremediation, Arsenic, Phosphorus, Arbuscular mycorrhiza.

Back to 3.5C Combating Global Soil & Land Degradation III. Agro- and Forest Ecosystems: Physical, Chemical and Biological Processes - Poster
Back to WCSS

Back to The 18th World Congress of Soil Science (July 9-15, 2006)