BioVector? NTCC? 2P24 Pseudomonas fluorescens BioVector?丁香假單胞菌植物促生根際細(xì)菌PGPR


BioVector? 2P24 菌株是一種被充分表征的植物促生根際細(xì)菌（PGPR），具體鑒定為丁香假單胞菌（Pseudomonas fluorescens）2P24。該菌株從中國(guó)的帶菌小麥土壤中分離得到，廣泛應(yīng)用于科學(xué)研究，特別是在植物病害生防、細(xì)菌調(diào)控以及廢水處理等領(lǐng)域。

主要特性與研究應(yīng)用
生防制劑：P. fluorescens 2P24 是一種有效的生防制劑，能夠?qū)苟喾N土壤傳播的植物病原體，例如立枯絲核菌（Rhizoctonia solani）和尖孢鐮刀菌（Fusarium oxysporum）。
次級(jí)代謝產(chǎn)物：其主要的抑病機(jī)制涉及產(chǎn)生對(duì)抗多種病原體有毒性的抗生素2,4-二乙酰基間苯三酚（2,4-DAPG）。
調(diào)控研究：該菌株被用于研究復(fù)雜的調(diào)控網(wǎng)絡(luò)，包括控制 2,4-DAPG 產(chǎn)生、運(yùn)動(dòng)性和生物膜形成等的 Gac/Rsm 系統(tǒng)、群體感應(yīng)（QS）以及 III 型和 VI 型分泌系統(tǒng)（T3SS 和 T6SS）。
廢水處理：研究表明，P. fluorescens 2P24 在從合成廢水和生活廢水中去除無(wú)機(jī)氮化合物（如銨和硝酸鹽）方面表現(xiàn)出高效率，表明其在環(huán)境修復(fù)中具有潛在應(yīng)用。
菌株變異體研究
科學(xué)家們已經(jīng)從野生型 P. fluorescens 2P24 中生成并研究了各種突變菌株，以了解特定的基因功能：
rpoZ 突變體 (2P24-ΔrpoZ)：該突變體顯示 2,4-DAPG 的產(chǎn)量顯著減少，并且喪失了對(duì)抗立枯絲核菌的拮抗作用，表明 rpoZ 基因是生防性狀的重要調(diào)節(jié)因子。
hfq 突變體 (PM107)：hfq 基因的缺失導(dǎo)致 2,4-DAPG 產(chǎn)量下降、生物膜形成減少，并削弱了在小麥根際定殖的能力。
rsmA rsmE 雙突變體：該突變體產(chǎn)生高水平的 2,4-DAPG，并且由于高濃度抗生素的毒性而生長(zhǎng)速率降低。
SPI-1 T3SS 突變體：invF 或 hilA 等基因發(fā)生突變的菌株顯示出對(duì)某些真菌抵抗性的改變、對(duì)葡萄糖的趨化反應(yīng)改變以及生物膜形成的變化，揭示了該分泌系統(tǒng)的多樣化功能。
NTCC? Pseudomonas fluorescens 2P24, a beneficial bacterium used as a biocontrol agent to suppress soil-borne plant diseases. Its main mechanism of action is the production of the antibiotic compound 2,4-diacetylphloroglucinol (2,4-DAPG). The production of 2,4-DAPG is tightly regulated by a complex network of genes and proteins, including the Gac/Rsm pathway, quorum sensing, and other regulatory proteins like GidA and TrmE.
Key features of Pseudomonas fluorescens 2P24
Biocontrol agent: It is used to control root diseases in plants.
Antibiotic production: Its primary biocontrol activity comes from producing the antibiotic 2,4-DAPG.
Complex gene regulation: The production of 2,4-DAPG is controlled by a sophisticated regulatory network involving various factors.
Quorum sensing: Strain 2P24 uses a quorum-sensing system to regulate its biocontrol activity.
Other abilities: It can also form biofilms, colonize wheat roots, and has been studied for its ability to remove ammonium and nitrate from water.
Regulation of 2,4-DAPG production
The production of this crucial antibiotic is managed through a fine-tuned regulatory system:
Gac/Rsm pathway: A two-component system (GacS-GacA) activates this pathway, which in turn regulates the production of small non-coding RNAs (sRNAs) that are involved in controlling 2,4-DAPG synthesis.
RsmA and RsmE proteins: These proteins act as repressors by binding to the messenger RNA (mRNA) of genes needed to produce 2,4-DAPG.
Small non-coding RNAs (sRNAs): These sRNAs can fine-tune the levels of RsmA and RsmE, allowing the bacteria to precisely control 2,4-DAPG production.
Other regulatory factors: Other proteins, such as GidA, TrmE, and GrxD, have also been found to play roles in positively or negatively regulating 2,4-DAPG production through various mechanisms, such as modifying tRNAs or interacting with other proteins in the pathway.

Classification: Pseudomonas fluorescens, a plant growth-promoting rhizobacterium (PGPR).
Source: Isolated from wheat take-all decline soil in Shandong Province, China.
Function: Biocontrol agent against various soil-borne pathogens like Rhizoctonia solani and Fusarium oxysporum.
Key Metabolite: Produces the antibiotic 2,4-diacetylphloroglucinol (2,4-DAPG) as a primary mechanism of action.
Regulatory Systems: Activity is regulated by complex systems, including the GacA/GacS two-component system and quorum sensing mechanisms.
Environmental Role: Exhibits high efficiency in removing inorganic nitrogen from wastewater.
Research Use: Widely used in studies concerning bacterial regulation, plant-microbe interactions, and environmental applications.

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