Distinct mineral weathering effectiveness and metabolic activity between mineral-weathering bacteria Burkholderia metallica F22 and Burkholderia phytofirmans G34
Distinct mineral weathering effectiveness and metabolic activity between mineral-weathering bacteria Burkholderia metallica F22 and Burkholderia phytofirmans G34
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DOI：
10.1016/j.chemgeo.2018.05.016
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发表时间：
2018-06
期刊：
影响因子：
3.9
通讯作者：
Qi Wang;Shan Gao;Xiang Ma;Xinxin Mao;Linyan He;X. Sheng
中科院分区：
文献类型：
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作者：
Qi Wang;Shan Gao;Xiang Ma;Xinxin Mao;Linyan He;X. Sheng
细菌在矿物风化、土壤形成和元素循环中发挥着重要作用。然而，人们对硅酸盐矿物和伯克霍尔德杆菌菌株之间的相互作用知之甚少。在这项研究中，矿物风化细菌金属伯克霍尔德菌F22和B。从生长在富含矿物质和贫营养土壤上的优势草（Deyeuxia arundinaceaL. Beauv）的根际土壤中分离出的phytofirmansG34，比较了它们在矿物风化过程中的钾长石风化和代谢活性。尽管这两个菌株表现出相似的 Si 动员能力，但与菌株 G34 相比，菌株 F22 表现出明显更高的 Al（范围从 41% 到 143%）和 Fe（范围从 47% 到 4.8 倍）的矿物质动员能力。此外，菌株F22比菌株G34产生更高的葡萄糖酸（68%至24倍）和胞外多糖（57%至2.2倍）。在矿物风化过程中，与菌株 G34 相比，在菌株 F22 存在下观察到显着更低的 pH（范围从 2.61 至 3.45）和更高的脱氢酶活性（范围从 24% 至 19 倍）。冗余分析表明葡萄糖酸和胞外多糖的浓度与溶解的Al和Fe之间存在很强的正相关性。这些结果表明，两种矿物风化伯克霍尔德杆菌在矿物风化及其代谢活动方面表现不同。研究结果还表明，伯克霍尔德氏菌F22通过增加风化过程中与矿物风化相关的代谢活动来促进钾长石风化。
Bacteria play important roles in mineral weathering, soil formation, and the cycling of elements. However, little is known regarding the interactions between silicate minerals and Burkholderia strains. In this study, mineral-weathering bacteriaBurkholderia metallicaF22 andB. phytofirmansG34 isolated from the rhizosphere soil of a dominant grass (Deyeuxia arundinaceaL. Beauv) grown on mineral-rich and nutrient-poor soil were compared for their potash feldspar weathering and metabolic activities during the mineral weathering process. Although the two strains showed similar mobilization of Si, strain F22 demonstrated significantly higher Al (ranging from 41% to 143%) and Fe (ranging from 47% to 4.8-fold) mobilization from the mineral compared to strain G34. In addition, strain F22 produced higher gluconic acid (ranging from 68% to 24-fold) and exopolysaccharides (ranging from 57% to 2.2-fold) than strain G34. Significantly lower pH (ranging from 2.61 to 3.45) and higher dehydrogenase activity (ranging from 24% to 19-fold) were observed in the presence of strain F22 than in the presence of strain G34 during the mineral weathering process. Redundancy analysis illustrated strong positive correlations between the concentrations of gluconic acid and exopolysaccharides and the dissolved Al and Fe. These results demonstrated that the two mineral-weatheringBurkholderiastrains behaved differently with respect to mineral weathering and in their metabolic activities. The results also suggested thatBurkholderia metallicaF22 promoted potash feldspar weathering by increasing mineral weathering-related metabolic activities during the weathering process.