Sinigrin degradation and G. pallida suppression in soil cultivated with brassicas under controlled environmental conditions

Ngala, Bruno M.; Woods, S. R.; Back, Matthew A.

doi:10.1016/j.apsoil.2015.05.009

Cited by 11 publications

(7 citation statements)

References 23 publications

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“…Previous studies suggested that Brassica and Allium were kinds of bioactive plants that could release bioactive compounds to suppress soil-borne pests and diseases [30,32]. In this study, the qPCR results showed that A. fistulosum and B. juncea reduced the proliferation of F. proliferatum in replanted soil (Figure 2), relying on their active compounds.…”

Section: Discussionmentioning

confidence: 50%

“…Consistent with this, fumigation led to the highest observed growth of replanted seedlings within two years in our study (Table 1). Previous studies suggested that Brassica and Allium were kinds of bioactive plants which could suppress soil-borne diseases and promote crop growth [27,30]. Thus, these bioactive plants are generally regarded as ideal materials for crop rotation, intercropping, and bio-fumigation [27,31].…”

Section: Discussionmentioning

confidence: 99%

“…Our results showed that mixed cropping with A. fistulosum and B. juncea could alleviate ARD in replanted apple seedlings and lead to more growth (Table 1). On the one hand, the root exudates of A. fistulosum and B. juncea could produce substances that kill soil-borne harmful fungi and promote the healthy growth of apple roots [16,28,30]; on the other hand, the root residues of A. fistulosum and B. juncea are decomposed to produce organic matter and other nutrients that promote apple tree growth [32]. This study provides a novel method of mixed cropping of apple seedlings with Allium and Brassica to suppress ARD.…”

Section: Discussionmentioning

confidence: 99%

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Control of Apple Replant Disease Using Mixed Cropping with Brassica juncea or Allium fistulosum

et al. 2022

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Evidence indicates that Allium and Brassica species which release bioactive compounds are widely used in bio-fumigation to suppress soil-borne diseases. However, the active molecules of such plant residues are easily volatilized. In this study, we conducted mixed cropping of the apple tree with Allium fistulosum or Brassica juncea; the results demonstrated that such mixed cropping significantly improved the growth of the grafted apple seedlings and alleviated apple replant disease (ARD) for two years. The terminal-restriction fragment length polymorphism profile results showed that the soil fungal community demonstrated distinct variation and diversity in terms of composition. A. fistulosum and B. juncea significantly improved the Margalef, Pielou, and Shannon indices. In addition, the analyses of clone libraries showed that A. fistulosum and B. juncea promoted the proliferation of antagonistic fungi such as Mortierella, Trichoderma, and Penicillium, and inhibited the proliferation of pathogens such as Fusarium. Fusarium. Proliferatum (F. proliferatum) was abundant in replanted soil and proved to be an aggressive pathogen of apple seedlings. Our findings thus indicate that apple tree mixed cropping with A. fistulosum and B. juncea was an effective long-term method for modifying the resident fungal community and alleviating ARD.

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Section: Discussionmentioning

confidence: 50%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Control of Apple Replant Disease Using Mixed Cropping with Brassica juncea or Allium fistulosum

et al. 2022

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“…These compounds could potentially be used to control pathogens by biofumigation, which involves mulching of plant tissues into soils to release biocidal allelochemicals. While biofumigation has previously been shown to suppress the growth of soil-borne fungal (8)(9)(10), nematode (11,12) and bacterial pathogens (13,14), outcomes are still varied, ranging from clear pathogen suppression (15,16) to having no effect (17)(18)(19). A better understanding of the antimicrobial and biocidal effects of plant allelochemicals on pathogens is thus required.…”

Section: Introductionmentioning

confidence: 99%

Plant pathogenic bacterium can rapidly evolve tolerance to an antimicrobial plant allelochemical

Friman

2021

Preprint

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Crop losses to plant pathogens are a growing threat to global food security, and hence, more effective control strategies are urgently required. Biofumigation, an agricultural technique, where Brassica plant tissues are mulched into soils to release antimicrobial plant allelochemicals called isothiocyanates (ITCs), has been proposed as an environmentally friendly alternative to synthetic agrochemicals. While biofumigation has been shown to suppress a range of plant pathogens, its effects on plant pathogenic bacteria remain largely unexplored. Here we used a laboratory model system to compare the efficacy of different types of ITCs against Ralstonia solanacearum plant bacterial pathogen. Additionally, we evaluated the potential for ITC-tolerance evolution under high, intermediate and low transfer frequency ITC exposure treatments. We found that allyl-ITC was the most efficient compound at suppressing R. solanacearum growth, and its efficacy was not improved when combined with other types of ITCs. Despite consistent pathogen growth suppression, ITC tolerance evolution was observed in the low transfer frequency exposure treatment. Mechanistically, tolerance was associated with parallel mutations in a gene linked to glucose/sorbonose dehydrogenase, resulting in cross-tolerance to ampicillin beta-lactam antibiotic. Interestingly, pathogen adaptation to the growth media also indirectly selected for increased ITC tolerance through potential metabolic adaptations linked with cell wall structure (serine/threonine kinase) and DNA replication, recombination and repair (deoxyribonucleases). Together, our results suggest that R. solanacearum can rapidly evolve tolerance to allyl-ITC plant allelochemical, which could constrain the long-term efficiency of biofumigation biocontrol and potentially shape pathogen evolution with plants.

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“…Among oilseed crops, biofumigant Brassicaceae crops have shown great potential within integrated pest management and organic farming solutions. In fact, some Brassica DSMs contain high level of glucosinolates (GSLs) and, after a patented procedure (Lazzeri et al, 2010), they proved to be suppressive against a variety of soil-borne fungal pathogens (Lazzeri et al, 2003), nematodes (Lazzeri et al, 2009;Ngala et al, 2015) and wire-worms (Furlan et al, 2010). In their native form, GSLs are stable and marginally reactive, while in the presence of water and the endogenous enzyme myrosinase (MYR) they are quickly hydrolyzed with the production of a series of bioactive breakdown products, mainly isothiocyanates (ITCs) and, to a lesser extent, nitriles, epithionitriles and thiocyanates, depending on the reaction conditions (Bones and Rossiter, 2006;Agerbirk and Olsen, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of defatted seed meals from Brassicaceae with or without crude glycerin against black grass (Alopecurus myosuroides Huds.)

Matteo

Back

Reade

et al. 2018

Industrial Crops and Products

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Herbicide resistance has become an increasing problem, and at the same time pesticide usage is declining due to stringent EU pesticide legislation which aims to reduce the impact on environment and human health. For these reasons, new alternative integrated weed management approaches are becoming increasingly relevant. Formulations based on Brassica defatted seed meals (DSMs) and glycerin, have previously been shown to be effective in reducing the germination of lettuce seed. In this work five DSMs, formulated with and without crude glycerin, were chosen for in vitro and glasshouse experiments: i) Brassica nigra, ii) Brassica tournefortii, iii) Eruca sativa, iv) Rapistrum rugosum and v) Sinapis alba. Black-grass (Alopecurus myosuroides), a weed demonstrating extensive herbicide resistance, was used as a target, and the germination inhibition caused on this weed by Brassica defatted seed meals was assessed. In both in vitro and in vivo experiments, the most effective DSM for inhibiting germination of both lettuce and black-grass seeds was the sinigrin containing DSM, Brassica nigra.

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Sinigrin degradation and G. pallida suppression in soil cultivated with brassicas under controlled environmental conditions

Cited by 11 publications

References 23 publications

Control of Apple Replant Disease Using Mixed Cropping with Brassica juncea or Allium fistulosum

Control of Apple Replant Disease Using Mixed Cropping with Brassica juncea or Allium fistulosum

Plant pathogenic bacterium can rapidly evolve tolerance to an antimicrobial plant allelochemical

Effectiveness of defatted seed meals from Brassicaceae with or without crude glycerin against black grass (Alopecurus myosuroides Huds.)

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