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首页> 外文会议>International Plant Nutrition Colloquium >A Pseudomonas sp. isolated from calcareous soil can tolerate stress by phenolic compounds exuded by red clover (Trifolium pratense L.) roots and secrete siderophores
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A Pseudomonas sp. isolated from calcareous soil can tolerate stress by phenolic compounds exuded by red clover (Trifolium pratense L.) roots and secrete siderophores

机译：假单胞菌从钙质土壤中分离出来的红三叶草（Trifolium pratense L.）根系分泌的酚类化合物可以耐受胁迫并分泌铁载体

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摘要

Red clover (Trifolium pratense L. cv. kenland) has been reported to be an iron (Fe)-efficient plant and releases phenolic compounds in large quantities under iron deficiency. Since most phenolic compounds are toxic to many microorganisms, they would have great impact on microbial communities in the rhizosphere of red clover. In the present study, one predominant bacterium was isolated from calcareous soils with root exudates collected from a hydroponic culture of red clover grown under iron-deficient conditions. This strain could not degrade or utilize phenol as a carbon source, but it tolerated phenol when present at up to 600 mg l~(-1). The 16S rDNA sequencing analysis identified the strain as belonging to the genus Pseudomonas. This strain can grow almost equally well in a Fe-free liquid culture medium as in a medium with FeCl_3 (10 μM). Both CAS (Chrome azurol S) assay and iron-hydroxides solubilization tests showed that this strain secreted siderophore and solubilised iron from insoluble Fe(OH)_3. The potential utilization of this strain to overcome iron deficiency in alkaline soils will be discussed.
机译：据报道，红三叶草（Trifolium pratense L. cv。kenland）是一种高效除铁（Fe）的植物，在铁缺乏时会大量释放酚类化合物。由于大多数酚类化合物对许多微生物都具有毒性，因此它们会对红三叶草根际的微生物群落产生巨大影响。在本研究中，从钙质土壤中分离出一种优势细菌，其根系分泌物是从缺铁条件下生长的红三叶草的水培培养物中收集的。该菌株不能降解或利用苯酚作为碳源，但是当其含量高达600 mg l〜（-1）时，它可以耐受苯酚。 16S rDNA测序分析确定该菌株属于假单胞菌属。该菌株在无铁液体培养基中的生长几乎与在FeCl_3（10μM）的培养基中一样好。 CAS（Chrome azurol S）分析和氢氧化铁增溶测试均表明，该菌株从不溶的Fe（OH）_3分泌铁载体和溶解的铁。将讨论该菌株克服碱性土壤中铁缺乏的潜在用途。

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