抗辐射球菌对结球甘蓝吸收^(134)Cs的影响

EFFECT OF Deinococcus radiodurans ON UPTAKE OF ^(134)Cs BY Brassica oleracea

在土壤中引入134Cs后接种抗辐射球菌(Deinococcus radiodurans),研究其对放射性铯在土壤中化学形态的影响。在抗辐射球菌存在的情况下,利用结球甘蓝(Brassica oleracea)吸收134Cs,初步研究了134Cs化学形态与结球甘蓝对其吸收能力的关系。结果表明:134Cs在土壤中主要以残留态形式存在,且接种抗辐射球菌的土壤残留态134Cs比在无菌土壤中的比例高28.64%~38.17%。结球甘蓝对134Cs的吸收量约为12100Bq/g,但在接种抗辐射球菌后,结球甘蓝对134Cs的吸收量约为8500Bq/g,比未接种细菌时的吸收量下降了约29%。抗辐射球菌可以改变134Cs在土壤中的化学形态,从而降低植物对134Cs的吸收。

Deinococcus radiodurans was inoculated into the soil which was spiked with ^134 Cs to investigate its effect on chemical speciation of ^134 Cs. The relationship between chemical speciation of ^134 Cs and its absorbtion capacity by cabbage （ Brassica oleracea ） in the presence of D. radiodurans was also investigated. The results showed that an increase of 28.64 % -38.17 % in content of ^134 Cs in residual phase was observed with presence of D. radiodurans in comparison with the aseptic control. The amounts of radiocesium uptaken by cabbage were about 12100Bq/g under aseptic conditions, however, which were about 8500Bq/g with the presence of D. radiodurans. The proportion of ^134Cs taken up by cabbage decreased about 29% in comparison with the aseptic control. The chemical speciation could be influenced by D. radiodurans so that its uptake by plants could be reduced.