Evaluation of the effects of soil microorganisms on sup(137)Cs uptake of soybean cultivars with different sup(137)Cs accumulation properties in seeds as affected by single/co-inoculation using Bradyrhizobium and arbuscular mycorrhizal fungi and soil types
2017
Haidari, M.D. (Tokyo University of Agriculture and Technology (TUAT), Fuchu, Tokyo (Japan). The United Graduate School of Agriculture) | Kojima, K. | Ohkama-Ohtsu, N. | Sugihara, S. | Sekimoto, H. | Habibi, S. | Yokoyama, T.
After the accident of Fukushima Daiichi Nuclear Power Plant (FDNPP), we screened Japanese soybean mini-core collections to select cultivars with low sup(137)Cs accumulation in seeds. Field tests at Fukushima Prefecture resulted in two groups of soybeans: one with low and the other with high Cs accumulation in seeds. We continued investigations to find the reasons. A reconfirmation field test and two pot experiments were conducted to evaluate the sup(137)Cs activity concentrations in various organs of soybean cultivars, focusing on the root nodules affected by single/co-inoculation with Bradyrhizobium and arbuscular mycorrhizal (AM) fungi in two types of soils. Oni hadaka with low, and Kuromame and Kurakake with high sup(137)Cs accumulation properties in seeds were the test cultivars. These cultivars had similar biomass and root surface area. Total sup(137)Cs inventory was greater in cultivars Kuromame and Kurakake. Average sup(137)Cs concentrations were in the order: root nodules > plant root > leaf > stem in Kuroboku soil, and root nodules similar/lower to that of plant root > leaf > stem in brown forest soil. Single/co-inoculation of AM fungi did not change the sup(137)Cs activity concentrations of root nodules and plant leaf/stem significantly; however, it increased the sup(137)Cs concentrations of plant roots than those of without AM fungi inoculation and also root nodules significantly. This shows that the sup(137)Cs retained by AM mycelium in the roots is not available to translocate into other parts in soybeans tested.
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