Induction of trap formation in nematode-trapping fungi by a bacterium

Li, Lei; Ma, Mingchuan; Liu, Yongjun; Zhang, Jingwei; Qu, Qing; Lu, Kai-Ping; Fu, Denggao; Zhang, Ke‐Qin

doi:10.1111/j.1574-6968.2011.02351.x

Cited by 24 publications

(14 citation statements)

References 22 publications

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“…(McClure, 1989 ); by inducing the activity of other nematode antagonists, such Chryseobacterium spp. that induce trap formation in Arthobotrys oligospora (Li et al, 2011 ); by suppressing disease severity, such Chryseobacterium spp. (Liu et al, 2014 ); or by parasitizing RKN eggs, such Fusarium equiseti and Cladosporium spp.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Soil Suppressiveness to Root-Knot Nematodes in Organic Horticulture in Plastic Greenhouse

et al. 2016

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The fluctuation of Meloidogyne population density and the percentage of fungal egg parasitism were determined from July 2011 to July 2013 in two commercial organic vegetable production sites (M10.23 and M10.55) in plastic greenhouses, located in northeastern Spain, in order to know the level of soil suppressiveness. Fungal parasites were identified by molecular methods. In parallel, pot tests characterized the level of soil suppressiveness and the fungal species growing from the eggs. In addition, the egg parasitic ability of 10 fungal isolates per site was also assessed. The genetic profiles of fungal and bacterial populations from M10.23 and M10.55 soils were obtained by Denaturing Gradient Gel Electrophoresis (DGGE), and compared with a non-suppressive soil (M10.33). In M10.23, Meloidogyne population in soil decreased progressively throughout the rotation zucchini, tomato, and radish or spinach. The percentage of egg parasitism was 54.7% in zucchini crop, the only one in which eggs were detected. Pochonia chlamydosporia was the only fungal species isolated. In M10.55, nematode densities peaked at the end of the spring-summer crops (tomato, zucchini, and cucumber), but disease severity was lower than expected (0.2–6.3). The percentage of fungal egg parasitism ranged from 3 to 84.5% in these crops. The results in pot tests confirmed the suppressiveness of the M10.23 and M10.55 soils against Meloidogyne. The number of eggs per plant and the reproduction factor of the population were reduced (P < 0.05) in both non-sterilized soils compared to the sterilized ones after one nematode generation. P. chlamydosporia was the only fungus isolated from Meloidogyne eggs. In in vitro tests, P. chlamydosporia isolates were able to parasitize Meloidogyne eggs from 50 to 97% irrespective of the site. DGGE fingerprints revealed a high diversity in the microbial populations analyzed. Furthermore, both bacterial and fungal genetic patterns differentiated suppressive from non-suppressive soils, but the former showed a higher degree of similarity between both suppressive soils than the later.

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Section: Discussionmentioning

confidence: 99%

Characterization of Soil Suppressiveness to Root-Knot Nematodes in Organic Horticulture in Plastic Greenhouse

et al. 2016

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“…oligospora, a nematophagous fungus, captures nematodes by using adhesive polymers present on traps which form a three dimensional network [19]. Recent studies revealed that some of bacteria could induce trap for mation in A. oligospora [20]. In our present experi ment, the filtrate of bacteria A. faecalis YMF 3.175 induced trap formation in this fungus.…”

Section: Bioassay For Inducing Trap Formation In a Oli Gospora By Amentioning

confidence: 49%

Bioactive constituents from the bacteirium Alcaligenes faecalis YMF 3.175

Wang

Zhang

et al. 2014

Appl Biochem Microbiol

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“…attached to hyphae of A. oligospora and their metabolites (Li et al . ). The data produced in this study are consistent to previous studies and indicate that either bacteria or their metabolites should attract a greater attention in the future, considering their potential effects on nematodes ecology.…”

Section: Resultsmentioning

confidence: 97%

Induction of trap formation in nematode-trapping fungi by bacteria-released ammonia

Wang

et al. 2016

Lett Appl Microbiol

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A total of 11 bacterial strains were assayed for bacteria-induced trap formation in the nematode-trapping fungus Arthrobotrys oligospora YMF1·01883 with two-compartmented Petri dish. These strains were identified on the basis of their 16S rRNA gene sequences. Volatile organic compounds (VOCs) of eight isolates were extracted using solid-phase micro-extraction (SPME) and their structures were identified based on gas chromatography-mass spectrometry (GC-MS). At the same time, all isolates were used for quantitative measurement of ammonia by the indophenol blue method. The effects of pure commercial compounds on inducement of trap formation in A. oligospora were tested. Taken together, results demonstrated that the predominant bacterial volatile compound inducing trap formation was ammonia. Meanwhile, ammonia also played a role in other nematode-trapping fungi, including Arthrobotrys guizhouensis YMF1·00014, producing adhesive nets; Dactylellina phymatopaga YMF1·01474, producing adhesive knobs; Dactylellina cionopaga YMF1·01472, producing adhesive columns and Drechslerella brochopaga YMF1·01829, producing constricting rings.

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Induction of trap formation in nematode-trapping fungi by a bacterium

Cited by 24 publications

References 22 publications

Characterization of Soil Suppressiveness to Root-Knot Nematodes in Organic Horticulture in Plastic Greenhouse

Characterization of Soil Suppressiveness to Root-Knot Nematodes in Organic Horticulture in Plastic Greenhouse

Bioactive constituents from the bacteirium Alcaligenes faecalis YMF 3.175

Induction of trap formation in nematode-trapping fungi by bacteria-released ammonia

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