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Biofumigation effects of brassicaceous cover crops on soil health in cucurbit agroecosystems in Hawaii, USA

Pedosphere 2022年第4期32卷 521-531页

作者： Philip WAISEN Zhiqiang CHENG Brent S.SIPES Koon-Hui WANG Department of plant and Environmental Protection Sciences University of Hawaii at ManoaHI 96822USA Department of Agriculture Papua New Guinea University of TechnologyLae 411Papua New Guinea University of California Agriculture and Natural Resources Division Cooperative ExtensionIndio CA 92201USA

Brassicaceous cover crops, such as brown mustard (Brassica juncea) and oil radish (Raphanus sativus), are commonly used for biofumigation, a process that utilizes isothiocyanates (ITCs) generated from the hydrolysis of glucosinolates in Brassica plants to suppress soil-borne pathogens, including plant-parasitic nematodes. Given the biocidal nature of ITCs, limited information is available on the non-target effects of biofumigation on free-living nematodes, which are reliable soil health indicators. The objectives of this study were to determine if biofumigation methods effective against plant-parasitic nematodes would have non-target effects on free-living nematodes, and to examine the relationships between biofumigation indicators and nematode communities. Three field trials were conducted to examine whether different biofumigation methods would affect free-living nematodes. Tissue maceration of biofumigant crops, soil tillage, and black plastic mulching were adopted singly or in combination to generate different regimes of biofumigation efficacy. Termination of biofumigant crops by tissue maceration and soil tillage followed by black plastic mulching for one week was most effective in suppressing plant-parasitic nematodes and enhancing bacterial decomposition. However, these effects did not last through the subsequent zucchini (Cucurbita pepo) crop cycle. When comparing changes in soil glucose and sulfate concentrations as indicators of biofumigation efficacy, we found that soil sulfate was a better indicator of biofumigation efficacy than soil glucose, owing to the more stable state of sulfate in soil. Canonical correspondence analysis between soil sulfate as a biofumigation indicator and nematode soil health indicators revealed strong positive correlations of sulfate level with the abundances of bacterivorous and carnivorous nematodes, enrichment index, brown mustard biomass, and soil temperature. However, biofumigation did not affect the nematode community stru

关键词： brown mustard free-living nematode glucose oil radish plant-parasitic nematode soil-borne pathogens sulfate

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Identification of Naturally Occurring Polyamines as Root-Knot nematode Attractants

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Molecular plant 2020年第4期13卷 658-665页

作者： Morihiro Oota Allen Yi-Lun Tsai Dan Aoki Yasuyuki Matsushita Syuuto Toyoda Kazuhiko Fukushima Kentaro Saeki Kei Toda Laetitia Perfus-Barbeoch Bruno Favery Hayato Ishikawa Shinichiro Sawa Graduate School of Science and Technology Kumamoto UniversityKurokami 2-39-1Kumamoto 860-8555Japan Graduate School of Bioagricultural Sciences Nagoya UniversityNagoya 464-8601Japan INRA Universite Cote d'AzurCNRSUMR 1355-7254 Institut Sophia AgrobiotechSophia-Antipolis 06900France Present address:Dormancy and Adaptation Research Unit RIKEN Center for Sustainable Resource ScienceYokohama 230-0045Japan

Root-knot nematodes(RKNs;genus Meloidogyne)are a class of plant parasites that infect the roots of many plant *** is believed that RKNs target certain signaling molecules derived from plants to locate their hosts;however,currently,no plant compound has been unambiguously identified as a universal RKN *** address this question,we screened a chemical library of synthetic compounds for Meloidogyne incognita *** breakdown product of aminopropylam ino-anthraquinone,1,3-diam inopropane,as well as its related compounds,putrescine and cadaverine,were found to attract *** exam ining various polyamines,*** were found to be attracted specifically by natural com pounds that possess three to five methylene groups between two terminal amino *** cryo-TO F-SIM S/SEM,cadaverine was indeed detected in soybean root cortex cells and the surrounding rhizosphere,establishing a chemical *** addition to cadaverine,putrescine and 1,3-diam inopropane were also detected in root exudate by HPLC-MS/*** ore,exogenously applied cadaverine is sufficient to enhance *** infection of Arabidopsis *** results suggest that *** is likely attracted by polyam ines to locate the appropriate host plants,and the naturally occurring polyamines have potential applications in agriculture in developing protection strategies for crops from RKN infection.

关键词： plant-parasitic nematode chemotaxis rhizosphere organic diamine

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Biofumigation: An alternative strategy for the control of plant parasitic nematodes

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Journal of Integrative Agriculture 2020年第7期19卷 1680-1690页

作者： Rebecca Jean Barnes BRENNAN Samantha GLAZE-CORCORAN Robert WICK Masoud HASHEMI University of Massachusetts Amherst Cranberry Station East WarehamMassachusetts 02538USA Stockbridge School of Agriculture University of Massachusetts AmherstAmherstMA 01003USA

plant-parasitic nematodes wreak havoc on the yield and quality of crops *** from these pests is estimated to exceed US$100 bllion annually but is likely higher due to *** damage may be catastrophic,but historically the solution has been damaging as *** of the synthetic nematicide methyl bromide(MBr)poses risks to the environment and to human ***,the use of plant material and naturally produced compounds to control pests,is an increasingly feasible method of pest *** process acts through the growth or incorporation of plant material into the soil,that,over the course of its degradation,releases glucosinolates that break down into nematotoxic *** secondary plant metabolites exist naturally in commonly grown plants,most of which belong to the Brassicaceae *** endeavors have increasingly explored the potential of *** reaction of target pests,the selection of biofumigant,and ideal environments for efficacy continue to be *** review seeks to provide a cost and benefit assessment of the status of biofumigation for the control of plant-parasitic nematodes as an alternative to conventional methyl bromide usage.

关键词： biofumigation plant-parasitic nematode Brassicaceae isothiocyanate methyl bromide

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New insights on the utilization of ultrasonicated mustard seed cake:chemical composition and antagonistic potential for root-knot nematode,Meloidogyne javanica

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2021年第7期22卷 563-574页

作者： Hera NADEEM Pieter MALAN Amir KHAN Mohd ASIF Mansoor AHMAD SIDDIQUI Simon TUHAFENI ANGOMBE Faheem AHMAD Department of Botany Aligarh Muslim UniversityAligarh-202002U.P.India Department of Botany School of Biological SciencesNorth-West University(Mafikeng Campus)Mmabatho 2735South Africa Pharmacopoeia Commission for Indian Medicine and Homeopathy Ghaziabad-201002U.P.India Faculty of Agriculture and Natural Resources University of NamibiaWindhoek 10026Namibia

This study focused,for the first time,on the effect of ultrasonic features on the extraction efficiency of secondary metabolites in mustard seed cake(MSC).The nematostatic potential of sonicated seed cake was examined against the second-stage juveniles(J2s)of root-knot nematode,Meloidogyne *** results show that a 35 ppm(parts per million)concentration of a sonicated extract(SE)sample of MSC caused 65%J2s mortality at 18 h exposure period in *** also significantly suppressed the root-knot index(RKI=0.94)in tomato *** lethal concentration values for SE were 51.76,29.79,and 13.34 ppm,respectively,at 6,12,and 18 h of the exposure period,and the lethal concentration values for the non-sonicated extract(NSE)sample were 116.95,76.38,and 55.59 ppm,respectively,at similar exposure *** and gluconapin were identified as the major compounds in ultrasonic-assisted *** of the high extraction efficiency of metabolites in the SE,all treat‐ments of SE were shown to be antagonistic to ***,this study of ultrasonication activity-based profiling of MSC may help generate target-based compounds at a scale relevant to the control of disease caused by nematodes in economic crops.

关键词： plant-parasitic nematode plant by-product Sono-extraction Liquid chromatography-electrospray ionization-mass spectrometry(LC-ESI-MS) Natural compound nematode management

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