Lauric acid in crown daisy root exudate potently regulates root-knot nematode chemotaxis and disrupts Mi-flp-18 expression to block infection

Dong, Lixin; Li, Xin; Huang, Lili; Gao, Yingying; Zhong, Lina; Zheng, Yuanyuan; Zuo, Yuanmei

doi:10.1093/jxb/ert356

Cited by 88 publications

(80 citation statements)

References 43 publications

(61 reference statements)

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“…La diferencia en la condición R, T y HPS de acuerdo con el número de NF en suelo y raíz tiene su origen en aspectos de la biología de los nematodos (por ejemplo, el ciclo de vida), y la interacción nematodo-arvense (por ejemplo, el tipo de parasitismo). La densidad de NF en suelo está relacionada con la liberación de sustancias químicas (exudados) a través de las raíces, las cuales constituyen atrayentes de NF hacia la planta (Curtis, 2008;Rasmann et al, 2012;Dong et al, 2014). Este fenómeno podría hacer que una arvense adquiera una condición R o T con base en un número alto de NF en suelo.…”

Section: Delilia Bifloraunclassified

“…El fenómeno de susceptibilidad se presenta en la planta como tal, por lo tanto, en este último ejemplo un número bajo de NF en suelo se puede atribuir a un efecto atrayente poco eficiente por parte de los exudados radicales producidos por la arvense. Esta situación se traduce en una baja atracción de NF hacia la zona radical y por consiguiente una baja densidad poblacional de los mismos (Dong, et al, 2014).…”

Section: Delilia Bifloraunclassified

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Evaluación de arvenses como hospedantes alternos de nematodos fitoparásitos en cafetales en Costa Rica

Peraza-Padilla¹,

Orozco-Aceves²

2018

Mesoam. Agron.

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Evaluación de arvenses como hospedantes alternos de nematodos fitoparásitos en cafetales en Costa Rica Assessment of weeds as alternative hosts of plant-parasitic nematodes in coffee plantations in Costa RicaWalter Peraza-Padilla 2 , Martha Orozco-Aceves 3 © 2018 Agronomía Mesoamericana es desarrollada en la Universidad de Costa Rica y se encuentra licenciada con Creative Commons Reconocimiento-NoComercial-SinObraDerivada 3.0 Costa Rica. Para más información escríbanos a pccmca@ucr.ac.cr ResumenLas arvenses pueden ser hospedantes alternos de nematodos fitoparásitos (NF); sin embargo, no existe una metodología que evalúe el riesgo fitosanitario de la presencia de estas en los cultivos. El objetivo de esta investigación fue determinar si las arvenses presentes en dos plantaciones de cafeto (orgánico y convencional) constituyen un riesgo al ser hospedantes alternos de NF. El estudio se llevó a cabo en dos fincas localizadas en Aserrí, San José, Costa Rica, durante agosto de 2010. En las plantaciones se identificaron las arvenses más importantes, se cuantificaron los nematodos de los géneros Meloidogyne, Pratylenchus y Helicotylenchus en suelo y raíz de las arvenses seleccionadas, y en los cafetos. Mediante análisis permutacional de varianza, se determinaron los géneros de NF cuyas poblaciones en arvenses fueron significativamente diferentes de las de cafetos. Con base en estos resultados, las arvenses se clasificaron como: reservorio, trampa, u hospedante poco susceptible de NF. Este criterio de clasificación, además del ciclo de vida y tipo de parasitismo de los NF, fueron utilizados para asignar valores numéricos a las arvenses. Con los valores numéricos se calculó un Índice de Riesgo Fitosanitario (IRF), el cual presentó un valor máximo de 10 para la arvense Oplismenus burnannii en la finca orgánica, y un valor máximo de 24 para Commelina diffusa, Emilia fosbergii, Delilia biflora y Spermacoce hirta, en la finca convencional. Los resultados indican que la presencia de estas arvenses en cafetales puede constituir un riesgo potencial para los cafetos desde el punto de vista nematológico.Palabras clave: Helicotylenchus, Meloidogyne, plantas hospederas, Pratylenchus. AbstractThere is potential for weeds to be alternative hosts of plant-parasitic nematodes (PPN), but a methodology that assesses the phytosanitary risk derived from the presence of weeds in plantations is not available. This research was conducted in order to determine if the presence of weeds in coffee plantations (organic and conventional) represented a phytosanitary risk due to their role as alternative hosts of PPN. The research was developed into two plantations Agron. Mesoam. 29(1):193-206, enero-abril, 2018 ISSN 2215-3608 doi: 10.15517/ma.v29i1.28078Peraza-Padilla y Orozco-Aceves: Arvenses hospedantes de nematodos fitoparásitos 194 IntroducciónLas arvenses (o malezas) son especies no deseadas en los cultivos agrícolas, incluyendo el cultivo del cafeto, debido, entre otros aspectos, a que pueden ser hospedantes alternos de nematodos fitoparásito...

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Section: Delilia Bifloraunclassified

Evaluación de arvenses como hospedantes alternos de nematodos fitoparásitos en cafetales en Costa Rica

Peraza-Padilla¹,

Orozco-Aceves²

2018

Mesoam. Agron.

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“…In addition, volatiles from nearby plants can modulate attraction of PPNs to host plants. For example, when intercropped with crown daisy, the tomato plant is protected from parasitism by the root-knot nematode Meloidogyne incognita [81]. Crown daisy roots produce lauric acid, which is attractive for PPNs at low concentrations but repulsive at high concentrations [81], reminiscent of the concentration-dependent effects of isoamyl alcohol on C. elegans [18].…”

Section: Introductionmentioning

confidence: 99%

“…For example, when intercropped with crown daisy, the tomato plant is protected from parasitism by the root-knot nematode Meloidogyne incognita [81]. Crown daisy roots produce lauric acid, which is attractive for PPNs at low concentrations but repulsive at high concentrations [81], reminiscent of the concentration-dependent effects of isoamyl alcohol on C. elegans [18]. After attracting M. incognita to crown daisy root, lauric acid appears to disrupt chemotaxis behavior and infectivity by downregulating expression of the FMRFamide-related neuropeptide FLP-18 [81].…”

Section: Introductionmentioning

confidence: 99%

“…Crown daisy roots produce lauric acid, which is attractive for PPNs at low concentrations but repulsive at high concentrations [81], reminiscent of the concentration-dependent effects of isoamyl alcohol on C. elegans [18]. After attracting M. incognita to crown daisy root, lauric acid appears to disrupt chemotaxis behavior and infectivity by downregulating expression of the FMRFamide-related neuropeptide FLP-18 [81]. The intercropping of certain plants may be a nonhazardous alternative to artificial pesticides: intercropping decreases PPN-induced crop damage through the modulation of PPN chemotaxis behavior.…”

Section: Introductionmentioning

confidence: 99%

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Olfactory circuits and behaviors of nematodes

Rengarajan

Hallem

2016

Current Opinion in Neurobiology

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Summary Over one billion people worldwide are infected with parasitic nematodes. Many parasitic nematodes actively search for hosts to infect using volatile chemical cues, so understanding the olfactory signals that drive host seeking may elucidate new pathways for preventing infections. The free-living nematode Caenorhabditis elegans is a powerful model for parasitic nematodes: because sensory neuroanatomy is conserved across nematode species, an understanding of the microcircuits that mediate olfaction in C. elegans may inform studies of olfaction in parasitic nematodes. Here we review circuit mechanisms that allow C. elegans to respond to odorants, gases, and pheromones. We also highlight work on the olfactory behaviors of parasitic nematodes that lays the groundwork for future studies of their olfactory microcircuits.

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Characterization of finger millet extracts and evaluation of their nematicidal efficacy and plant growth promotion potential

Chrisantus,

Sarah,

Dorcas

et al. 2024

Plant Enviro Interactions

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Plant‐parasitic nematodes pose a significant threat to finger millet crops, potentially causing yield reduction of up to 70%. Extracts derived from finger millet varieties contain potent bioactive compounds that can mitigate nematode damage and promote plant growth. This study aimed at isolating and characterizing bioactive compounds from the finger millet varieties Ikhulule, Okhale‐1, and U‐15; evaluating the impact of Ikhulule and U‐15 extracts on the mortality of the root lesion nematode Pratylenchus vandenbergae; assessing the growth promotion effects of Ikhulule and U‐15 extracts on the finger millet variety Okhale‐1; and determining the efficacy of these extracts in managing plant‐parasitic nematodes under greenhouse conditions. Extracts were obtained from both leaves and roots and tested in vitro for nematode mortality and in vivo for growth promotion and nematode control. The results showed that finger millet extracts exhibited strong nematicidal properties in vitro, achieving a mortality rate of up to 98% against P. vandenbergae nematodes. Applying these extracts to finger millet shoots significantly reduced nematode populations in both soil and roots and decreased the reproductive factor to below one (1), indicating an effective nematode control. The study attributes the enhanced nematicidal effects of finger millet extracts to their bioactive compounds, particularly dodecanoic acid, phytol, 1,1,4a‐trimethyl‐6‐decahydro naphthalene, 2,3‐dihydro‐benzofuran, 2‐methoxy‐4‐vinylphenol and ethyl ester, and hexadecanoic acid. These findings suggest that finger millet‐derived extracts offer a natural solution for nematode management and broader agronomic benefits, ultimately contributing to overall plant health and productivity.

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Lauric acid in crown daisy root exudate potently regulates root-knot nematode chemotaxis and disrupts Mi-flp-18 expression to block infection

Abstract: Lauric acid is a bioactive root exudate component in crown daisy. Mi-flp-18 is a pivotal gene regualting nematode chemotaxis and infection. Lauric acid regulates the nematode chemotaxis and disrupts the Mi-flp-18 expression in a concentration-dependent manner

Cited by 88 publications

References 43 publications

Evaluación de arvenses como hospedantes alternos de nematodos fitoparásitos en cafetales en Costa Rica

Evaluación de arvenses como hospedantes alternos de nematodos fitoparásitos en cafetales en Costa Rica

Olfactory circuits and behaviors of nematodes

Characterization of finger millet extracts and evaluation of their nematicidal efficacy and plant growth promotion potential

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