Stable cesium uptake and accumulation capacities of five plant species as influenced by bacterial inoculation and cesium distribution in the soil
Stable cesium uptake and accumulation capacities of five plant species as influenced by bacterial inoculation and cesium distribution in the soil
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DOI：
10.1007/s10265-014-0647-x
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发表时间：
2014-09-01
影响因子：
2.8
通讯作者：
Yokoyama, Tadashi
中科院分区：
文献类型：
--
作者：
Djedidi, Salem;Kojima, Katsuhiro;Yokoyama, Tadashi
研究了接种芽孢杆菌和固氮菌对小松菜属、阿马兰斯属、高粱属、小米属和荞麦属5种植物在铯污染土壤上生长和铯积累的影响。盆栽实验进行了“人工”铯污染土壤。根据Cs在土壤中的定位，采用3种处理。对于盆中15 cm的土壤高度，Cs如下添加：在顶部5 cm中模拟不耕作条件;在底部5 cm中模拟倒置耕作;并且均匀分布的Cs再现正常耕作。一般来说，接种Cs暴露的植物显着增强生长和耐受性，这种元素。转移因子（植物组织中的Cs浓度与周围土壤中的Cs浓度之比）受Cs分布的强烈影响，在顶部Cs处理中具有较高的值。在此处理中，接种小松与芽孢杆菌和固氮菌菌株导致最大的转移因子分别为6.55和6.68。接种固氮菌的小松菜、阿马兰斯和荞麦的芽中铯含量高，即，每盆分别为1，830、1，220和1，030 μ g（每盆种植5株植物）。因此，接种小松菜和阿马兰斯与这里测试的菌株可以有效地提高Cs的积累。在均匀和底层Cs处理下Cs转移的减少表明，旨在减少Cs转移的对策可以依赖于耕作措施。
The effects of inoculation with Bacillus and Azospirillum strains on growth and cesium accumulation of five plant species, Komatsuna, Amaranth, sorghum, common millet and buckwheat, grown on cesium-spiked soil were assessed for potential use in cesium remediation. Pot experiments were performed using "artificially" Cs-contaminated soil. Three treatments were applied based on Cs location in the soil. For a soil height of 15 cm in the pots, Cs was added as follows: in the top five cm to imitate no ploughing condition; in the bottom five cm simulating inverted ploughing; and uniformly distributed Cs reproducing normal plowing. Generally, inoculation of Cs-exposed plants significantly enhanced growth and tolerance to this element. Transfer factor (ratio of Cs concentration in the plant tissues to that in surrounding soil) was strongly influenced by Cs distribution, with higher values in the top-Cs treatment. Within this treatment, inoculation of Komatsuna with Bacillus and Azospirillum strains resulted in the greatest transfer factors of 6.55 and 6.68, respectively. Cesium content in the shoots was high in the Azospirillum-inoculated Komatsuna, Amaranth, and buckwheat, i.e., 1,830, 1,220, and 1,030 A mu g per pot, respectively (five plants were grown in each pot). Therefore, inoculation of Komatsuna and Amaranth with the strains tested here could be effective in enhancing Cs accumulation. The decrease of Cs transfer under uniform- and bottom-Cs treatments would suggest that countermeasures aiming at decreasing the transfer of Cs could rely on ploughing practices.