期刊
ENVIRONMENTAL POLLUTION
卷 241, 期 -, 页码 63-73出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2018.04.121
关键词
Cadmium; Rhizosphere; Bacterial community; Rice cultivar; Proteobacteria
资金
- National Natural Science Foundation of China [41401366, 31370040]
- National Key Research and Development Program of China [2017YFD0801303, 2016YFD0800805]
- Zhejiang Provincial Major Research and Development Program of China [2015C03020]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [201469]
- Fundamental Research Funds for the Central Universities [2018FZA6007]
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.
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