Cultivar-specific response of bacterial community to cadmium contamination in the rhizosphere of rice (Oryza sativa L.)
Cultivar-specific response of bacterial community to cadmium contamination in the rhizosphere of rice (Oryza sativa L.)
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DOI：
10.1016/j.envpol.2018.04.121
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发表时间：
2018-10-01
影响因子：
8.9
通讯作者：
Tian, Shengke
中科院分区：
文献类型：
--
作者：
Hou, Dandi;Wang, Runze;Tian, Shengke
镉在水稻籽粒中的积累主要取决于其生物有效性，而生物有效性受土壤理化性质和微生物学过程的影响。研究了在Cd污染土壤上种植的水稻品种（HA和LA）的根际细菌群落。在低（0.44 mg kg（-1））和高（6.66 mg kg（-1））土壤Cd水平下，HA根系吸收Cd量分别是LA根系的7.26倍和2.25倍。无论Cd水平如何，HA根际Cd生物有效性显著高于LA。种植水稻和镉水平升高都显着降低细菌α多样性和改变细菌群落结构，水稻品种之间有显着差异。在HA根际（拟杆菌门，厚壁菌门，和Deltaproteobacteria）特别丰富的类群可以直接或间接地参与金属活化，而LA根际高度殖民植物生长促进类群（门α变形菌和γ变形菌）。研究结果表明，水稻对Cd的吸收和积累与根际细菌之间存在潜在的关联，从而为水稻安全的维护提供了基础数据和新的视角。(C)2018爱思唯尔有限公司版权所有
Cadmium accumulation in rice grains is highly dependent on its bioavailability that affected by various physicochemical properties and microbiological processes of soil. The rhizospheric bacterial communities of rice grown in contaminated soils by means of rice cultivars highly or weakly accumulating Cd in grains (HA and LA, respectively) were investigated. HA roots absorbed 7.26- and 2.25-fold more Cd than did LA roots at low (0.44 mg kg(-1)) and high (6.66 mg kg(-1)) soil Cd levels, respectively. Regardless of Cd levels, Cd bioavailability in the rhizosphere of HA was significantly higher than that of LA. Planting of rice and elevated Cd levels both significantly decreased bacterial alpha-diversity and altered bacterial community structure, with noticeable differences between the rice cultivars. Taxa specifically enriched in the HA rhizosphere (phyla Bacteroidetes, Firmicutes, and Deltaproteobacteria) can directly or indirectly participate in metal activation, whereas the LA rhizosphere was highly colonized by plant growth promoting taxa (phyla Alphaproteobacteria and Gammaproteobacteria). The results indicate a potential association of Cd uptake and accumulation with rhizosphere bacteria in rice grown on a contaminated soil, thus providing baseline data and a new perspective on the maintenance of rice security. (C) 2018 Elsevier Ltd. All rights reserved.