|Table of Contents|

Effect of cadmium in the V-Ti tailings soil on the potassium-dissolving ability of potassium-dissolving bacteria(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2019 01
Page:
76-82
Research Field:
Articles
Publishing date:

Info

Title:
Effect of cadmium in the V-Ti tailings soil on the potassium-dissolving ability of potassium-dissolving bacteria
Author(s):
CUI Yongliang1 LI Yanmei2 LI Lijun1 YOU Ke2 ZHENG Xiaoqin1 TU Weiguo1 WANG Qiongyao1 ZHUANG Qiguo1 WANG Yongzhi1 WU Fan1 & YU Xiumei2**
1 Sichuan Provincial Academy of Natural Resource Sciences, Chengdu 610015, China 2 Department of Resources, Sichuan Agricultural University, Wenjiang 611130, China
Keywords:
potassium-dissolving bacteria cadmium Advenella tailing soil
CLC:
S154.3 : X53
PACS:
DOI:
10.19675/j.cnki.1006-687x.2018.04016
DocumentCode:

Abstract:
Potassium-dissolving bacteria can decompose potassium feldspar, apatite, and other insoluble silicon aluminate inorganic minerals. The insoluble potassium in soil is converted into a soluble nutrient that promotes plant growth and development. However, the diversity of potassium-dissolving bacteria in the V-Ti magnetite tailings soil and the effects of heavy metal cadmium on the potassium-dissolving ability of bacteria remain unclear. A total of 136 bacterial strains were isolated from the V-Ti magnetite tailing soil in Panzhihua by inoculating bacteria on potassium feldspar. The qualitative screening and quantitative measurement of the potassium-dissolving activity of the isolates led to the identification of seven highly efficient potassium-dissolving bacterial strains, including three Rhizobium, two Bacillus, one Ochrobactrum, and one Advenella strains. Their evolutionary status was determined by performing a similarity and phylogenetic analysis of their 16S rRNA genes. Their potassium-dissolving efficiency change rule was measured under different concentrations of cadmium stress, revealing the influence of cadmium on their potassium-dissolving ability. Their soluble potassium content was 18.63–31.32 mg/L in the potassium feldspar liquid medium. Among the seven strains, Advenella KT106 showed the highest potassium-dissolving capacity, and its highest potassium-dissolving content was obtained at the sixth hour. KT106 showed tolerance against cadmium. The potassium-dissolving efficiency decreased with increasing concentrations of cadmium stress. Only 5% bacteria from the V-Ti magnetite tailings soil showed the potassium-dissolving ability, but these potassium-dissolving bacteria had certain diversity. Cadmium had an inhibition effect on the potassium-dissolving activity of bacteria. This study provided a scientific basis for the use of potassium-dissolving bacteria in the phytoremediation of heavy metal-contaminated soil.

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Last Update: 2019-02-25