Influence of soil types and osmotic pressure on growth and 137Cs accumulation in blackgram (Vigna mungo L.)

Publication date: April 2017
Source:Journal of Environmental Radioactivity, Volumes 169–170
Author(s): Khin Thuzar Win, Aung Zaw Oo, Sonoko Dorothea Bellingrath-Kimura
A pot experiment was conducted to study the effects of soil types and osmotic levels on growth and ¹³⁷Cs accumulation in two blackgram varieties differing in salinity tolerance grown in Fukushima contaminated soils. The contamination levels of the sandy clay loam and clay soil were 1084 and 2046 Bq kg⁻¹ DW, respectively. The ¹³⁷Cs activity was higher in both plants grown on the sandy clay loam than on the clay soil regardless of soil ¹³⁷Cs activity concentration. No significant differences were observed in all measured growth parameters between the two varieties under optimal water conditions for both types of soil. However, the growth, leaf water contents and ¹³⁷Cs activity concentrations in both plants were lower in both soil types when there was water stress induced by addition of polyethylene glycol. Water stress-induced reduction in total leaf area and total biomass, in addition to leaf relative water content, were higher in salt sensitive 'Mut Pe Khaing To' than in salt tolerant 'U-Taung-2' plants for both soil types. Varietal difference in decreased ¹³⁷Cs uptake under water stress was statically significant in the sandy clay loam soil, however, it was not in the clay soil. The transfer of ¹³⁷Cs from soil to plants (i.e., root, stem and leaf) was higher for the sandy clay loam for both plants when compared with those of the clay soil. The decreased activity of ¹³⁷Cs in the above ground samples (leaf and stem) in both plants in response to osmotic stress suggested that plant available ¹³⁷Cs decreased when soil water is limited by osmotic stress.



http://ift.tt/2jtu5XY