Genotypic difference in 137Cs accumulation and transfer from the contaminated field in Fukushima to azuki bean (Vigna angularis)

Publication date: July 2016
Source:Journal of Environmental Radioactivity, Volumes 158–159
Author(s): Khin Thuzar Win, Aung Zaw Oo, Katsuhiro Kojima, Djedidi Salem, Hiroko Yamaya, Sonoko Dorothea Bellingrath-Kimura, Norihiko Tomooka, Akito Kaga, Naoko Ohkama-Ohtsu, Tadashi Yokoyama
The screening of mini-core collection of azuki bean accessions (Vigna angularis (Willd.) Ohwi & Ohashi) for comparative uptake of ¹³⁷Cs in their edible portions was done in field trials on land contaminated by the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident. Ninety seven azuki bean accessions including their wild relatives from a Japanese gene bank, were grown in a field in the Fukushima prefecture, which is located approximately 51 km north of FDNPP. The contamination level of the soil was 3665 ± 480 Bq kg⁻¹ dry weight (¹³⁷Cs, average ± SD). The soil type comprised clay loam, where the sand: silt: clay proportion was 42:21:37.There was a significant varietal difference in the biomass production, radiocaesium accumulation and transfer factor (TF) of radiocaesium from the soil to edible portion. Under identical agricultural practice, the extent of ¹³⁷Cs accumulation by seeds differed between the accessions by as much as 10-fold. Inter-varietal variation was expressed at the ratio of the maximum to minimum observed ¹³⁷Cs transfer factor for seeds ranged from 0.092 to 0.009. The total biomass, time to flowering and maturity, and seed yield had negative relationship to ¹³⁷Cs activity concentration in seeds. The results suggest that certain variety/varieties of azuki bean which accumulated less ¹³⁷Cs in edible portion with preferable agronomic traits are suitable to reduce the ¹³⁷Cs accumulation in food chain on contaminated land.



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