Reduced Meloidogyne incognita infection of tomato in the presence of castor and the involvement of fatty acids

Dong, Lixin; Liao, Xiaolin; Huang, Chengdong; Lu, Qiaofang; Li, Baoshen; Yao, Yuanyuan; Liu, Tongtong; Zuo, Yuanmei

doi:10.1016/j.scienta.2018.03.066

Cited by 20 publications

(6 citation statements)

References 29 publications

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“…This growth promotion may be attributable to the suppression of the M. incognita infection and the nutrient content of the fermentation broth. , Many crops naturally release nematotoxic compounds into the environment either from their roots or directly from the plant tissue to suppress RKNs. Some residues have been used as nematicides to control nematodes and promote plant growth .…”

Section: Discussionmentioning

confidence: 99%

Nematicidal Effect of Methyl Palmitate and Methyl Stearate against Meloidogyne incognita in Bananas

Liu

Wang

et al. 2020

J. Agric. Food Chem.

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Banana plants (Musa spp.) are susceptible to infection by many plant-parasitic nematodes, including Meloidogyne incognita. In this study, a mixed fermentation broth of chicken manure (CM) and cassava ethanol wastewater (CEW) was used to inhibit M. incognita by reducing egg hatching and by having a lethal effect on second-stage juvenile nematodes (J2s). It also alleviated nematode damage and promoted banana plant growth. Using gas chromatography–mass spectrometry (GC–MS), we identified methyl palmitate and methyl stearate as bioactive compounds. These bioactive compounds repelled J2s and inhibited egg hatching; reduced root galls, egg masses, and nematodes in soil; and downregulated the essential parasitic nematode genes Mi-flp-18 and 16D10. A Caenorhabditis elegans offspring assay showed that low concentrations of the fermentation broth, methyl palmitate, and methyl stearate were safe for its life cycle. This study explored the effective and environmentally safe strategies for controlling root-knot nematodes.

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Section: Discussionmentioning

confidence: 99%

Nematicidal Effect of Methyl Palmitate and Methyl Stearate against Meloidogyne incognita in Bananas

Liu

Wang

et al. 2020

J. Agric. Food Chem.

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“…Indeed, the expression of flps is upregulated in the H. avenae [135] and G. pallida [69] par-J2 stage, just as in C. elegans dauer [69]. The involvement of flps in locomotion associated with dauer is further supported by the fact that downregulation of flps in the closely related root-knot nematode species M. incognita and M. graminicola reduces hatching and infectivity [152][153][154][155].…”

Section: Dauer In Clade 12 Parasitic Nematodesmentioning

confidence: 95%

On the role of dauer in the adaptation of nematodes to a parasitic lifestyle

et al. 2021

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Nematodes are presumably the most abundant Metazoa on Earth, and can even be found in some of the most hostile environments of our planet. Various types of hypobiosis evolved to adapt their life cycles to such harsh environmental conditions. The five most distal major clades of the phylum Nematoda (Clades 8–12), formerly referred to as the Secernentea, contain many economically relevant parasitic nematodes. In this group, a special type of hypobiosis, dauer, has evolved. The dauer signalling pathway, which culminates in the biosynthesis of dafachronic acid (DA), is intensively studied in the free-living nematode Caenorhabditis elegans, and it has been hypothesized that the dauer stage may have been a prerequisite for the evolution of a wide range of parasitic lifestyles among other nematode species. Biosynthesis of DA is not specific for hypobiosis, but if it results in exit of the hypobiotic state, it is one of the main criteria to define certain behaviour as dauer. Within Clades 9 and 10, the involvement of DA has been validated experimentally, and dauer is therefore generally accepted to occur in those clades. However, for other clades, such as Clade 12, this has hardly been explored. In this review, we provide clarity on the nomenclature associated with hypobiosis and dauer across different nematological subfields. We discuss evidence for dauer-like stages in Clades 8 to 12 and support this with a meta-analysis of available genomic data. Furthermore, we discuss indications for a simplified dauer signalling pathway in parasitic nematodes. Finally, we zoom in on the host cues that induce exit from the hypobiotic stage and introduce two hypotheses on how these signals might feed into the dauer signalling pathway for plant-parasitic nematodes. With this work, we contribute to the deeper understanding of the molecular mechanisms underlying hypobiosis in parasitic nematodes. Based on this, novel strategies for the control of parasitic nematodes can be developed.

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“…This response is probably elicited by lauric acid's concentration-dependent regulation of Mi-flp-18 gene expression (Dong et al, 2014). Moreover, two other active compounds, namely palmitic acid and linoleic acid derived from castor root exudates, was found to repel M. incognita and inhibited the expression of Mi-flp-18 and Mi-mpk-1 (mitogenactivated protein kinase) genes in a concentration-dependent manner (Dong et al, 2018). Silencing G. pallida flp genes (Gp-flp-1, -6, -12, -14, or -18) resulted in aberrant behavioral phenotypes, which further confirms that flp genes play key roles in motor function and suggests that flp gene silencing can be a novel plant parasite control strategy (Kimber et al, 2007).…”

Section: Modes Of Action Of Root Metabolites In Nematodesmentioning

confidence: 99%

Impacts of Root Metabolites on Soil Nematodes

Sikder

Vestergård

2020

Front. Plant Sci.

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Plant parasitic nematodes cause significant crop damage globally. Currently, many nematicides have been banned or are being phased out in Europe and other parts of the world because of environmental and human health concerns. Therefore, we need to focus on sustainable and alternative methods of nematode control to protect crops. Plant roots contain and release a wide range of bioactive secondary metabolites, many of which are known defense compounds. Hence, profound understanding of the root mediated interactions between plants and plant parasitic nematodes may contribute to efficient control and management of pest nematodes. In this review, we have compiled literature that documents effects of root metabolites on plant parasitic nematodes. These chemical compounds act as either nematode attractants, repellents, hatching stimulants or inhibitors. We have summarized the few studies that describe how root metabolites regulate the expression of nematode genes. As non-herbivorous nematodes contribute to decomposition, nutrient mineralization, microbial community structuring and control of herbivorous insect larvae, we also review the impact of plant metabolites on these nontarget organisms.1 study on effect of both plant and specific metabolites detected in root exudates of the plant, 2 study on effect of plant, 3 study on effect of synthetic compound on nematodes, NA indicate not applicable.

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Reduced Meloidogyne incognita infection of tomato in the presence of castor and the involvement of fatty acids

Cited by 20 publications

References 29 publications

Nematicidal Effect of Methyl Palmitate and Methyl Stearate against Meloidogyne incognita in Bananas

Nematicidal Effect of Methyl Palmitate and Methyl Stearate against Meloidogyne incognita in Bananas

On the role of dauer in the adaptation of nematodes to a parasitic lifestyle

Impacts of Root Metabolites on Soil Nematodes

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