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allelochemicals and allelopathy from microorganisms in wheat rhizosphers

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Journal of Environmental Sciences 1997年第1期9卷 108-112页

作者： Ma Ruixia Liu Xiufen Yuan Guanglin Sun Sien Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China Res. Ctr. for Eco-Environ. Sciences Chinese Academy of Sciences Beijing 100085 China

allelochemicals from fungi and bacteria in wheat rhizosphere,as well as their allelo- pathic effects on wheat and maize have been conducted.Fungi and bacteria were incubated at tem- perature 28-30℃.The extracts were tested for bioassay.Some samples identified to be responsi- ble for allelopathy have been determined by GC-MS.Some chemicals identified were selected to test again their bioactivity.The results showed that acidic extracts were more toxic to germination of wheat and maize seeds(statistic significant difference P<0.01 or P<0.05)and basic extracts were less toxic and stimulated effects on germination in some cases.A good relationship has been observed between the data of chemical analysis and bioassay. A wide variety of chemicals such as phenolic acids,organic acids,aldehydes,alcohol,ke- tones,nitrogen-containing chemicals,were identified by GC-MS.Some phenols and organic acids were identified to be inhibit and nitrogens-containing compounds were to be stimulate to germina- tion of seeds and extension of root and shoot of wheat and maize.

关键词： allelochemicals allelopathy soil bacteria soil fungi.

The Study of allelochemicals of the Melon Fly (Myiopardalis pardalina Bigot.)

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Agricultural Sciences 2023年第8期14卷 1098-1107页

作者： Omon Kholbekov Gulnara Shakirzyanova Azimjon Mamadrahimov Bahrom Babayev Turgun Jumakulov Jahongir Turdibayev Acad. A. S. Sadykov Institute of Bioorganic Chemistry Academy of Sciences of the Republic of Uzbekistan Tashkent Uzbekistan Faculty of Chemistry National University of Uzbekistan Named after M. Ulugbek Tashkent Uzbekistan Department of Chemistry and Physics Almalyk Branch of the Tashkent State Technical University Named after I. Karymov Almalyk Uzbekistan

This study describes the isolation, identification of allelochemicals of the melon fly (Myiopardalis pardalina Bigot.), using the GC-MS method. A food attractant has been identified and a method for the synthesis of its synthetic analogue has been developed. Also, a route for the synthesis of para pheromone, raspberry ketone, has been proposed.

关键词： Melon Fly (Myiopardalis pardalina Bigot.) Melon (Cucumis melo) Pheromonitoring allelochemicals Biomass Adults GC-MS-Spectroscopy

Extraction of allelochemicals from poplar alkaline peroxide mechanical pulping effluents and their allelopathic effects on Microcystis aeruginosa

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Journal of Bioresources and Bioproducts 2020年第4期5卷 276-282页

作者： Yanyan Wang Mengxing Zhao Tingzhi Liu Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and TechnologyTianjin 300457China

In this study,allelochemicals were extracted from pulping effluents rather than from the raw ma-terial of plants.Herein,five organic solvents(ethyl acetate(EAC),methyl tert-butyl ether(MTBE),dichloromethane(DCM),carbon tetrachloride(CTC),and petroleum(PE))were applied to sep-arately extracting the allelochemicals from alkaline peroxide mechanical pulp(APMP)effluents.The results from the algal density,inhibition ratio,and optical density of 446 nm(OD 446nm)concluded that the extractives from the APMP effluents can act as effective allelochemicals and showed noticeable allelopathic inhibition effects on Microcystis aeruginosa growth.The results in-dicated that organic solvent extraction could be a practical approach to isolate the allelochemicals from the APMP effluents,which would broaden the potential application of the APMP effluents in the production of antimicrobial agents and other value-added materials.

关键词： Allelopathic inhibition allelochemicals Organic solvent extraction Microcystis aeruginosa Alkaline peroxide mechanical pulping(APMP) effluents

Effects of allelochemicals on activity of nitrate reductase

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Journal of Environmental Sciences 2000年第1期12卷 127-130页

作者： MA Rui\|xia (Research Center for Eco\|Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)

Study on the effects of allelochemicals such as trans \|ferulic acid ( t \|FA), benzoic acid (BA) and p \|hydroxybenzoic acid ( p \|HA), isolated from decomposed wheat straw on the activity of nitrate reductase at different concentrations of allelochemicals and different pH is described. t \|FA (0.26, 2.58 and 5.15 mmol/L) and BA (4.09, 8.19 mmol/L) showed a certain inhibition to the activity of nitrate reductase. The highest inhibition rate was 18.40%, but BA (0.41 mmol/L) and p \|HA (0.36, 1.81 and 3.62 mmol/L) showed stimulation, the more strong stimulation rate was 15.80%. At pH 6 condition, the activity of nitrate reductase was stronger inhibited than pH 7 and pH 8, but the mixture of 3 allelochemicals at pH 6 showed a stimulation. The mixture, however, at pH 7 and pH 8 showed some inhibition. It was found that there was a relationship between production of NO\+-\-2 and transformation of NO\+-\-3.

关键词： allelochemicals nitrate reductase denitrification activity CLC number: S131 Document code: A

Role of extracellular polymeric substances in resistance to allelochemical stress on Microcystis aeruginsosa and its mechanism

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Journal of Oceanology and Limnology 2023年第6期41卷 2219-2231页

作者： Li YIN Ying XU Desheng KONG Juan WANG Kaipian SHI Yong ZHANG Huan HE Shaogui YANG Lixiao NI Shiyin LI School of Environment Nanjing Normal UniversityNanjing 210023China Department of Geological Sciences University of AlabamaTuscaloosaAL 35487USA Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education/School of Environment Hohai UniversityNanjing 210098China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China

Using allelochemicals to suppress cyanobacteria growth is a prospective method for its high efficiency and ecological safety.However,the suppression efficiency is affected inevitably by the extracellular polymeric substances(EPS)produced by cyanobacteria,and the knowledge about the roles of EPS in resistance to allelochemical stress is scarce.For the study,two typical anti-cyanobacterial allelochemicals were adopted to investigate the role of EPS in resistance to allelochemical stress on Microcystis aeruginosa.Results show that EPS was crucial in alleviating the toxicity of allelochemicals to algae,especially in stabilizing the metabolism and photosynthetic activity of algal cells.The aggregation rate of algal cells increased with the increase of EPS secretion,which alleviated the stress of allelopathy.Tryptophan proteins and humic acids in EPS provided a binding site for allelochemicals,and the EPS-allelochemicals complex were formed by chemical bonding.This study improved our comprehension of the role of EPS in algal inhibition by allelochemicals.

关键词： allelochemicals extracellular polymeric substances cyanobacteria Microcystis aeruginosa allelopathy

Identification and Quantification of allelochemicals from Selected Sweet Potato (<i>Ipomoea batatas</i>(L.) Lam.) Cultivars

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American Journal of Plant Sciences 2019年第12期10卷 2354-2365页

作者： Bhawna Soni Te-Ming Paul Tseng Ziming Yue Department of Plant and Soil Sciences Mississippi State University Mississippi State MS USA

Allelopathic compounds have the potential to inhibit the growth and development of other organisms in a diverse manner ranging from shifting nutrients and enhancing their growth to inflicting diseases. In addition, these compounds influence seedling growth and seed germination of various crops. The goal of this study was to identify and quantify different allelochemicals in various sweet potato cultivars through high-performance liquid chromatography techniques. Selected sweet potato slips (weight: 2.0 - 2.5 grams/slip) were propagated in separate glass tubes filled with 10.0 mL distilled water. Water extract from each glass tube was collected after 2, 4, and 6 weeks after transplanting (WAP) to identify and quantify allelochemical compounds by comparing their peaks with the retention time of standards. Results show that the concentration of allelochemicals in water extract was increased from 2 to 4 WAP but remained constant in the sixth week. Quantitative analysis revealed that the amount of chlorogenic acid was higher in all sweet potato cultivars compared to other allelochemicals. Some sweet potato cultivars, A5 and A39, exhibited higher allelopathy (18.28 - 19.37 ppm/slip) and reduced the height and biomass of Palmer amaranth the most due to the presence of increased concentration of combined allelochemicals, while other cultivars produced lesser allelochemicals (10.90 ppm/slip) and did not reduce the growth of the weed species. Allelopathic sweet potato cultivars high in chlorogenic acid production can effectively suppress Palmer amaranth with minimal dependence on chemicals to manage weeds and harmful pests under sustainable agricultural system.

关键词： Sweet Potato (Ipomoea batatas (L.) Lam.) allelochemicals High Performance Liquid Chromatography Seedling Growth Retention Time

Inductive and synergistic interactions between plant allelochemical flavone and Bt toxin Cry1 Ac in Helicoverpa armigera

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Insect Science 2021年第6期28卷 1756-1765页

作者： Shan Wang Min Zhang Jinyong Huang Leyao Li Kaiyuan Huang Yuting Zhang Yalu Li Zhongyuan Deng Xinzhi Ni Xianchun Li School of Agricultural Sciences Zhengzhou UniversityZhengzhouChina School of Life Sciences Zhengzhou UniversityZhengzhouChina USDA-ARS Crop Genetics and Breeding Research UnitUniversity of Georgia-Tifton CampusTiftonGAUSA Department of Entomology and BI05 Institute University of ArizonaTucsonAZUSA

Genetically engineered crops simultaneously produce defensive allelochemi-cals and Bacillus thuringiensis(Bt)toxin proteins to kill some of the world's most devastating insect pests.How the two types of toxins,when ingested sequentially or simultaneously,interact at both lethal and sublethal doses in these pests remains underexplored.Here,we examined the toxicological interactions between the Bt toxin Cry 1 Ac and the flavonoid allelochemical flavone in Helicoverpa armigera.Simultaneous exposure of H.armigera neonates to lethal doses(LC25)of Cry 1 Ac and flavone caused a mortality significantly higher than that of either toxin alone and their expected additive mortality.Preexposure for 24 h to a sublethal dose(LC10)of Cry 1 Ac followed by 6-d simultaneous exposure to the same dose of Cry 1 Ac plus a lethal dose(1.6 mg/g diets,LC50)of flavone resulted in a mortality significantly higher than that of the LC50 dose of flavone alone and the expected additive mortality of the LC50 dose of flavone plus the LC10 dose of Cry 1 Ac.One-day preexposure to the sublethal dose(LC10)of flavone followed by 6-d simultaneous exposure to the LC50 dose(6 ng/cm2)of Cry 1 Ac plus the LC25 dose of flavone yielded a mortality significantly higher than that of the LC50 dose of Cry 1 Ac but similar to the expected additive mortality of the LC50 dose of Cry 1 Ac plus the LC50 dose of flavone.The results suggest that Cry 1 Ac induces and synergizes the toxicity of flavone against H.armigera larvae.

关键词： allelochemicals Bt crops combination toxicity induced toxicity resistance toxicological interactions

allelochemicals Involved in Rice Allelopathy

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Allelochemicals Involved in Rice Allelopathy

Sustainable Utilization of Agricultural Straw for Harmful Algal Blooms Control:A Review

中国第二届植物化感作用学术研讨会暨中国植物保护学会植物...

作者： Chuihua Kong Xiaohua Xu Institute of Applied Ecology Chinese Academy of Sciences State Key Laboratory of Elemento-organic Chemistry Nankai University

allelochemicals play an important role in natural and managed ecosystems. Food crop Oryza sativa L. can produce and release allelochemicals participating in its defense against weeds. However, it remains obscure which allelochemicals in rice are predominantly involved in defense mechanisms against weeds. In this study, many kinds of compounds were systematically isolated and identified from allelopathic rice PI 312777 seedlings. Among them, alkaloids, alkylresorcinols, cyclohexenone and urea derivatives, flavonoids and their glucosides, diterpenoids and triterpenes had inhibitory activities on the growth of Echinochloa crus-galli, Cyperus difformis and Leptochloa chinensis weeds associated with rice. However, the presence of these compounds in allelopathic rice seedlings does not necessarily mean that they can be released into the environment to demonstrate their allelopathic effects under natural field conditions. Accordingly, allelochemicals released from selected rice seedlings into soil were determined and analyzed by LC/MS and HPLC. As a result, phenolic acids, flavonoids, diterpenoids and cyclohexenone and urea derivatives were found in soil- grown allelopathic rice seedlings. Particularly, 3-isopropyl-5-acetoxy- cyclohexene-2-one-1, momilactone B and 5,7,4′-trihydroxy-3,5- dimethoxyflavone occurred in the soil at day 15 after rice seedlings emergence, and reached the concentration initiated for inhibition on associated weeds at day 30 after rice emergence, while other compounds were not detected or they were as trace only in the soil. These results suggest that 3-isopropyl-5-acetoxycyclohexene-2-one-1,momilactone B and 5,7,4′-trihydroxy-3,5-dimethoxyflavone are allelochemicals involved in rice allelopathy and allelopathic rice seedlings can establish their own weed defense mechanism through production and release of these allelochemicals.

关键词： Oryza sativa L allelochemicals allelopathy isolation and identification secondary metabolite soil.

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Journal of Renewable Materials 2020年第5期8卷 461-483页

作者： Kokoette Effiong Jing Hu Caicai Xu Tao Tang Haomin Huang Jiangning Zeng Xi Xiao Ocean College Zhejiang UniversityZhouShan316021China School of Environment and Energy South China University of TechnologyGuangzhou510006China Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China Key Laboratory of Marine Eco-monitoring and Remediation Technology Ministry of Natural ResourcesShanghai200137China

The use of agricultural straw for algal bloom control has been studied for more than 30 years.In this article,we have reviewed the promising potentials of using agricultural straw as source of anti-algal agents,including the effectiveness of each major straw type so far used in this regard,and the investigated algal species.Various pre-treatment methods have also been widely reviewed.Significant progress has been made in natural product chemistry and molecular biology with regards to agricultural straw,especially in relation to the extraction of antialgal allelochemicals,degradation processes of agricultural straws and the mechanisms through which these inhibitions occur.The development of biotechnologies using agricultural straw to successfully inhibit growth of bloom forming algae has been generally accepted as environmentally friendly.The current research status and that of the future should include isolation and discovery of antialgal allelochemicals,development of models that would illustrate the sequence of physiologic events that match the species-specific inhibitor phenomenon,and products fit in the field applications.

关键词： Agricultural straw eutrophication harmful algal blooms allelochemicals algal inhibition bioremediation