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标题：Fluorescent pseudomonads (FPs) as a potential biocontrol and plant growth promoting agent associated with tomato rhizosphere
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作者：Perumal Suresh ; Shanmugaiah Vellasamy ; Khalid S. Almaary 等
期刊名称：Journal of King Saud University - Science
印刷版ISSN：1018-3647
出版年度：2021
卷号：33
期号：4
页码：1-13
DOI：10.1016/j.jksus.2021.101423
语种：English
出版社：Elsevier
摘要：AbstractA total of 87 FPs have been isolated from tomato(Lycopersicon esculentum) rhizosphere and evaluated by dual plate assay method for the antimicrobial activity ofRalstonia solanacearum. Of which, 30 FPs showed antagonistic activity againstR. solanacearumwith the zone of inhibitions (ZOI) ranging from 19 mm to 28 mm. Similarly, antagonistic FPs significantly controlled various fungal phytopathogens such asRhizoctonia solani(6.3 mm−20 mm), Macrophomina phaseolina(8.7 mm−19.3 mm),Fusarium oxysporum(7.3 mm−30.7 mm), andSclerotium rolfsii(5.3 mm−21 mm). The cell-free culture filtrate ofPseudomonassp VSMKU3054 significantly suppressed the fungal pathogens and increased the root and shoot length of the tomato seedlings compared to the control. Furthermore, the antagonistic FPs effectively produced lytic enzymes and antimicrobial traits such as amylase (6), protease (30), cellulase (28), pectinase (12), chitinase (22), gelatinase (27), siderophore (28), hydrogen cyanide (25), phosphate solubilization (30), and Indole acetic acid (IAA) (23). Genetic diversity of FPs was assessed by BOX-PCR with specific primers revealed that two distinct clusters were observed, whereas, RFLP analyses were showed that 5 to 16 bands ranged from 75 bp to 1.2 bp with two major clusters using restriction enzymeHaeIII. The antibiotic encoding genes were detected from FPs, of which 10 FPs were positive for 2,4-diacetylphloroglucinol (DAPG), 9 FPs were positive for pyoleuterin (PLT), 10 FPs were positive for hydrogen cyanide (HCN) and none of them obtained pyrrolnitrin (PRN) with respective primers. Based on the superior antagonistic isolates againstR. solanacearumand phytofungal pathogens and other antimicrobial traits, the isolate VSMKU3054 was selected for further studies. Based on the morphological, physiological and 98% of 16 s rDNA sequence similarity, the selected isolate VSMKU3054 was identified asPseudomonas fluorescens. Further, the potential isolateP. fluorescensVSMKU3054 and cell free culture filtrate remarkably enhance tomato seedling growth such as root and shoot length, fresh and dry weight and vigor index compared to control. This study indicated that rhizospheric isolates of FPs have more potential for plant growth promotion and plant protection from plant pathogenic microbes.
关键词：Fluorescent pseudomonads;Ralstonia solanacearum;Fungal pathogens;Antibiotic encoding genes;Antimicrobial traits and plant growth promotion