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A study on the pathogen species and physiological races of tomato fusarium wilt in Shanxi,China

Journal of Integrative Agriculture 2018年第6期17卷 1380-1390页

作者： CHANG Yin-dong DU Bin WANG Ling JI Pei XIE Yu-jie LI Xin-feng LI Zhi-gang WANG Jian-ming College of Agriculture Shanxi Agricultural University Department of Horticulture Taiyuan University Technology Center Yuncheng Sub-Center Shanxi Entry-Exit Inspection and Quarantine Bureau Department of Genetics and Biochemistry Clemson University

In order to clarify the main pathogens of tomato fusarium wilt in Shanxi Province, China, morphological identification, elongation factor 1 alpha （EF-1α） sequence analysis, specific primer amplification and pathogenicity tests were applied to study the isolates which were recovered from diseased plants collected from 17 different districts of Shanxi Province. The results were as follows： 1） Through morphological and molecular identification, the following 7 species of fusarium were identified： F. oxysporum, F. solani, F. verticillioides, F. subglutinans, F. chlamydosporum, F. sporotrichioides, and F. semitectum; 2） 56 isolates of F. oxysporum were identified using specific primer amplification, among which, 29, 5 and 6 isolates were respectively identified as F. oxysporum f. sp. lycopersici physiological race 1, race 2, and race 3; 3） pathogenicity test indicated the significant pathogenicity of F. oxysporum, F. solani, F. verticillioides, and F. subglutinans to tomato plant. Therefore, among these 4 species confirmed as pathogenic to tomato in Shanxi, the highest isolation rate （53.3％） corresponded to F. oxysporum. Three physiological species, race 1, race 2, and race 3 of F. oxysporum f. sp. lycopersici are detected in Shanxi, among which race 1 is the most widespread pathogen and is also considered as the predominant race.

关键词： tomato fusarium wilt fusarium oxysporum f. sp. lycopersici physiological races EF-1α sequence analysis specific primer amplification

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Inhibitory Effects of Extracts from Marigold(Tagetes patula) against tomato fusarium wilt

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Plant Diseases and Pests 2011年第1期2卷 5-6,13页

作者：李鲜花刘永华榆林学院生命科学学院陕西榆林719000

[ Objective ] The study aimed to explore a new way for the control of tomato fusarium wilt. [ Method ] Different solvents were used to prepare the ex-tracts of marigold, and the inhibitory effects of different extraction solvents and different extraction parts of marigold against tomato Fusar/um wilt were compared. [ Result ] Among different solvent extracts of marigold, chloroform extracts had the strongest inhibitory effects against the growth of the pathogen; among the chloro- form extracts from different parts of marigold, root extract had the most obvious inhibitory effect against the disease, followed by flower and leaf extracts, and the in- hibitory effect of stem extract was the weakest. [ Conclusion ] The active components of marigold have inhibitory effect against tomato fusarium wilt, and the plant has good development prospects and application value.

关键词： Extract of marigold tomato fusarium wilt Inhibitory effect

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Role of root microbiota in suppressing tomato wilt disease

Role of root microbiota in suppressing tomato wilt disease

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中国菌物学会2018年学术年会

作者： Xin Zhou Lei Cai State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of Sciences University of Chinese Academy of Sciences

fusarium wilt of tomato caused by pathogen fusarium oxysporum f. sp. lycopersici（FOL） is one of the most devastating soil-borne disease for tomato. Roots zones（rhizosphere, rhizoplane, and endospheric） are essential for microbiome-plant interactions. In this study, we addressed the role of root microbiota in suppressing tomato wilt disease, by sampling the FOL diseased tomato and healthy tomato roots. We compared root zone microbial communities between the healthy and diseased tomato. In total 539 fungal OTUs and 3682 bacterial OTUs were identified, among which 168 fungal OTUs and 187 bacterial OTUs are enriched in healthy root zone samples. The β-diversity analysis revealed that the health state of the root is the major factor correlated to the tomato root microbiota, followed by root zone areas. Healthy root enriched genera such as Acinetobacter,Aeromonas, Aspergillus, Bacillus, Chaetomium, Chloroflexus, Lysinibacillus, Sporosarcina, Penicillium,Paenibacillus and Pseudomonas. We also observed that the root zone area also has strong selection to its associated microbiota. It is also significant that healthy tomato enriched OTUs that are well-known as biocontrol species such as Aspergillus penicillioides, Aspergillus subversicolor, Bacillus spp., Trichocladium asperum,Lysinibacillus alkaliphilus, Paenibacillus tundrae, Penicillium citrinum, Penicillium chrysogenum, Penicillium herquei, Pseudomonas oryzihabitans, Trichoderma ghanense. Our results, revealed that the root zone microbial assemblages formed significantly larger and more complex networks than the bulk soil communities and the root microbiome networks have high degrees of co-occurrence. Based on the co-occurrence analyses, we identified several keystone species related to the health state in the tomato root microbes, and hypothesized that these keystone species together with some biocontrol species worked together in suppressing the FOL disease in tomato root zone. Finally, our work provides new insights i

关键词： fusarium oxysporum Biocontrol tomato fusarium wilt Soil-borne disease

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