<i>Microdochium tabacinum</i>, Confirmed as a Pathogen of Alfalfa in Gansu Province, China

Wen, Zhang; Duan, Taizhong; Christensen, Michael J.; Zhang, Nan

doi:10.1094/pdis-10-13-1048-re

Cited by 17 publications

(7 citation statements)

References 27 publications

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“…The seedlings were examined after 2 weeks of incubation. Disease severity ratings were categorized as 0 = healthy, 1 = primary root tip necrotic but firm, 2 = primary root tip rotted and soft, 3 = dead seedling, and 4 = dead seed (Wen et al, 2015). The disease index (DI) was calculated as follows:…”

Section: Pathogenicity Testsmentioning

confidence: 99%

Grazing Intensity Affects Communities of Culturable Root‐Associated Fungi in a Semiarid Grassland of Northwest China

et al. 2017

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Intensive grazing by large herbivores is known to result in the degeneration of grassland worldwide. However, little is known about how grazing affects the fungi living in roots, especially those with septate hyphae. We investigated grazing intensity effects on culturable root‐associated fungi (c‐RAF) of three dominant plant species; Artemisia capillaris, Lespedeza davurica, and Stipa bungeana, in a semiarid grassland of northwest China. Plant roots were sampled from four grazing intensities at four sampling dates. The total colonization rate of c‐RAF was not affected by grazing intensity, but the diversity of c‐RAF displayed a hump‐shaped trend with grazing intensities. Few c‐RAF were present in all plant species, with most of them being confined to only one or two plant species. The 16 most commonly isolated species were selected to investigate their effects on plant growth and health. Three Fusarium species were most pathogenic c‐RAF. Three dark‐sterile species did not affect growth parameters, regardless of host plants. With A. capillaris, the occurrence of Fusarium spp. was highest in the control plots, while with S. bungeana, the occurrence tended to increase as the grazing intensity increased. Two dark‐sterile species, including Darksidea alpha, in L. davurica roots increased with grazing intensities; in contrast, D. alpha decreased for S. bungeana with grazing intensities. Our results strongly suggest that in grasslands, grazing intensity can lead to changes in the colonization of specific root fungal taxa, and these fungal changes would potentially feed back to plant performance depending on the abundance of host plants. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Pathogenicity Testsmentioning

confidence: 99%

Grazing Intensity Affects Communities of Culturable Root‐Associated Fungi in a Semiarid Grassland of Northwest China

et al. 2017

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“…In China, it was first reported on tomato and later on, it was reported as a pathogen of alfalfa and sunflower. [31][32][33] There is no report on its involvement in ginger soft rot disease. Therefore, our detection in the present study may be the first report as a causative agent in ginger soft rot disease.…”

Section: Discussionmentioning

confidence: 99%

Isolation and molecular characterization of ginger soft rot pathogenic fungi in Aizawl district of Mizoram, India

Rosangkima¹,

Vanramliana²,

Lalthanzara³

et al. 2018

Sci Vis

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Ginger soft rot disease caused by fungal pathogens have become one of the most serious problems causing reduced production around the world. It has also caused a major problem among farmers of Mizoram state in India resulting in a huge decline in rhizome yield. However, the exact causative agents of this disease have not been identified in the state. Therefore, the present study was undertaken to isolate and characterized the causative agents of ginger soft rot disease from the diseased plants collected from five different villages of Aizawl district, Mizoram. Isolated fungi were cultured and morphological and molecular identification were done using internal transcribed spacer of rDNA. Fusarium oxysporum, F. solani and Plectosphaerella cucumerina were identified in ginger samples from five villages. Fusarium spp. were the most common and seem to be the major causative agents. It is suggested that further investigation is required to explore the diversity of ginger soft rot pathogenic fungi in the whole state which could be helpful in introducing effective and eco-friendly disease management programme.

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“…An approximately 0·1 g sample of the root system of each plot was cut into 1 cm segments, and the root samples were stained with Trypan blue (Phillips and Hayman 1970) to determine colonization rates of AMF using the gridline intersect method (Giovannetti and Mosse 1980). The pathogen was re‐isolated from F. oxysporum inoculated roots using the method described by Wen et al (2015) and microscopically identified based on morphological characteristics of the colony.…”

Section: Methodsmentioning

confidence: 99%

Dual inoculation of alfalfa ( Medicago sativa L.) with Funnelliformis mosseae and Sinorhizobium medicae can reduce Fusarium wilt

Wang

Ding²,

Li³

et al. 2020

J Appl Microbiol

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Aims: This study was designed to evaluate the biocontrol of the arbuscular mycorrhizal fungus (AMF) Funnelliformis mosseae and the rhizobium Sinorhizobium medicae on alfalfa (Medicago sativa) wilt caused by Fusarium oxysporum, a severe soil-borne fungal pathogen. Methods and Results: The effects of co-inoculation of F. mosseae and S. medicae on alfalfa growth, nitrogen, phosphorus uptake and wilt caused by F. oxysporum were tested. Plant defence-related chemicals were measured to reveal the biochemical mechanism by which alfalfa responds to pathogen infection and how it is regulated by AMF and rhizobium. Pathogen infection caused typical yellowing of alfalfa leaflets and significantly reduced plant AMF colonization. AMF or rhizobium alone and the co-inoculation reduced the plant disease index by 83Á2, 48Á4 and 81Á8% respectively. Inoculation with AMF or rhizobium alone increased the dry weight of alfalfa by more than 13 and 3 times respectively; it also increased plant chlorophyll content by 65Á6 and 16Á6% respectively. Co-inoculation of AMF and rhizobium induced the plant to accumulate more disease-related antioxidant enzymes, plant hydrolase and plant hormones, such as superoxide dismutase, b-1,3-glucanase, chitinase, and phenylalanine ammonialyase, abscisic acid, ethylene and H 2 O 2 , under pathogen stress. Conclusions: Co-inoculation with F. mosseae and S. medicae offered complementarily improved alfalfa nutrient uptake and growth, which increased plant health. The co-inoculation of AMF and rhizobium regulated plant physiological and biochemical processes and induced plants to produce defence-related compounds, thus decreasing the severity of disease. The simultaneous application of F. mosseae and S. medicae is a potential biocontrol strategy to increase the systemic defence responses of alfalfa to Fusarium wilt. Significance and Impact of the Study: This research showed that complex plant-pathogen interactions are affected by rhizobium and AMF, providing insight into plant-microbiome interactions in the rhizosphere as well as the application of the microbiome in agriculture production.

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Microdochium tabacinum, Confirmed as a Pathogen of Alfalfa in Gansu Province, China

Cited by 17 publications

References 27 publications

Grazing Intensity Affects Communities of Culturable Root‐Associated Fungi in a Semiarid Grassland of Northwest China

Grazing Intensity Affects Communities of Culturable Root‐Associated Fungi in a Semiarid Grassland of Northwest China

Isolation and molecular characterization of ginger soft rot pathogenic fungi in Aizawl district of Mizoram, India

Dual inoculation of alfalfa ( Medicago sativa L.) with Funnelliformis mosseae and Sinorhizobium medicae can reduce Fusarium wilt

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