Rhizosphere colonization pattern of Agrobacterium radiobacter strain G12A, an antagonistic rhizobacterium to the potato cyst nematode Globodera pallida

Hackenberg, C.; Vrain, T. C.; Sikora, R. A.

doi:10.1016/s0944-5013(99)80035-4

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…may suppress SCN populations in some soils and likewise has potential for biocontrol of a variety of plant-parasitic nematodes (3,10,49). Several bacteria have been found to inhibit infection of crops by cyst nematodes, either through direct inhibition or parasitism of the nematode or through host plant-induced resistance (13,18,20,45,53).…”

mentioning

confidence: 99%

Bacteria Associated with Cysts of the Soybean Cyst Nematode ( Heterodera glycines )

Nour

Lawrence²,

Zhu

et al. 2003

Appl Environ Microbiol

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The soybean cyst nematode (SCN), Heterodera glycines, causes economically significant damage to soybeans (Glycine max) in many parts of the world. The cysts of this nematode can remain quiescent in soils for many years as a reservoir of infection for future crops. To investigate bacterial communities associated with SCN cysts, cysts were obtained from eight SCN-infested farms in southern Ontario, Canada, and analyzed by culture-dependent and -independent means. Confocal laser scanning microscopy observations of cyst contents revealed a microbial flora located on the cyst exterior, within a polymer plug region and within the cyst. Microscopic counts using 5-(4,6-dichlorotriazine-2-yl)aminofluorescein staining and in situ hybridization (EUB 338) indicated that the cysts contained (2.6 ؎ 0.5) ؋ 10 5 bacteria (mean ؎ standard deviation) with various cellular morphologies. Filamentous fungi were also observed. Live-dead staining indicated that the majority of cyst bacteria were viable. The probe Nile red also bound to the interior polymer, indicating that it is lipid rich in nature. Bacterial community profiles determined by denaturing gradient gel electrophoresis analysis were simple in composition. Bands shared by all eight samples included the actinobacterium genera Actinomadura and Streptomyces. A collection of 290 bacteria were obtained by plating macerated surfacesterilized cysts onto nutrient broth yeast extract agar or on actinomycete medium. These were clustered into groups of siblings by repetitive extragenic palindromic PCR fingerprinting, and representative isolates were tentatively identified on the basis of 16S rRNA gene sequence. Thirty phylotypes were detected, with the collection dominated by Lysobacter and Variovorax spp. This study has revealed the cysts of this important plant pathogen to be rich in a variety of bacteria, some of which could presumably play a role in the ecology of SCN or have potential as biocontrol agents.

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mentioning

confidence: 99%

Bacteria Associated with Cysts of the Soybean Cyst Nematode ( Heterodera glycines )

Nour

Lawrence²,

Zhu

et al. 2003

Appl Environ Microbiol

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“…Another study showed that B. cereus significantly decreased M. incognita and M. javanica populations in roots of Arabidopsis through the development of systemic resistance (Jiang et al 2020). Hackenberg et al (1999) found that Agrobacterium radiobacter (G12) plays an essential role in preventing Globodera spp. juveniles from penetrating potato (S. tuberosum) roots.…”

Section: Induced Systemic Resistance (Isr)mentioning

confidence: 99%

Plant growth promoting rhizobacteria (PGPR) and their role in plant-parasitic nematodes control: a fresh look at an old issue

2022

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The increasing demand for agricultural products can be met by maximizing production potential and reducing crop losses caused by common plant-parasitic nematodes. Chemical-based nematode management is a successful technique for mitigating damage and yield losses caused by nematode pests; however, inappropriate and irresponsible application of synthetic pesticides has negative impacts on fauna, bioflora, and natural enemies such as predators and parasites. The use of biocontrol agents is the most appreciated method for nematode control among farmers because it’s safe and reduces environmental pollution. There is increasing focus on the biological control of plant-parasitic nematodes using plant growth-promoting rhizobacteria (PGPR) as a biopesticide. Moreover, PGPR strains can promote plant growth by producing various secondary metabolites of these PGPRs. This review focuses on the direct (Nitrogen fixation, phytohormone formation, phosphate solubilization, Potassium solubilization, siderophores and ammonia production) and indirect mechanisms (Hyperparasitism, antibiosis, lytic enzyme production, induced systemic resistance) of action of PGPR in plant-parasitic nematodes management, and the future prospects of PGPR-based plant-parasitic nematodes biocontrol agents.

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Conventional and Organic Management as Divergent Drivers for Plant Parasitic Nematodes Control

Khanna

Gautam

Kapoor

et al. 2022

Sustainability in Plant and Crop Protection

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Rhizosphere colonization pattern of Agrobacterium radiobacter strain G12A, an antagonistic rhizobacterium to the potato cyst nematode Globodera pallida

Cited by 6 publications

References 11 publications

Bacteria Associated with Cysts of the Soybean Cyst Nematode ( Heterodera glycines )

Bacteria Associated with Cysts of the Soybean Cyst Nematode ( Heterodera glycines )

Plant growth promoting rhizobacteria (PGPR) and their role in plant-parasitic nematodes control: a fresh look at an old issue

Conventional and Organic Management as Divergent Drivers for Plant Parasitic Nematodes Control

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