First report of<i>Neocosmospora vasinfecta</i>associated with the root rot complex of peanuts in Vietnam

Dau, Van Thanh; Pham, L. T.; Luong, Thi-Hoan; Huynh, Loi; Tran, N.T.; Ho, Tiffany; Hoang, Ha; Phan, H. T.; Burgess, L. W.

doi:10.1071/dn10028

Cited by 7 publications

(13 citation statements)

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“…N. vasinfecta an incident of wilt of Clusterbean have been reported by Patel, Patel, Desai and Khandar (1998). N. vasinfecta associated with the root rot complexes of peanuts has been reported in Vietnam (Dau et al, 2010) and China (Huang, Chen, & Chung, 1992). Cornely et al (2001) reported N. vasinfecta as human pathogenic fungi in a patient with acute non lymphocytic leukemia on the basis of 5.8S nuclear rDNA region.…”

Section: Discussionmentioning

confidence: 99%

Molecular diagnosis and intraspecific genetic variability of root pathogens of arid legumes in Western Rajasthan, India

Gautam

Singh

Sharma

2016

RBT

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Abstract:The productivity of arid legumes, such as Clusterbean (Cyamopsis tetragonoloba), Cowpea (Vigna unguiculata), Moth bean (Vigna aconitifolia) and Horse gram (Macrotyloma uniflorum), may remain stagnant over decades because of their high susceptibility to root diseases. Besides, there is a limitation on the information about molecular diagnosis and intraspecific genetic variability of root pathogens in arid legumes. To contribute in this field, we assessed a total of 52 isolates from 88 root samples that were found infected with fungal pathogens in Jodhpur, Jaipur and Bikaner Districts of Rajasthan. Diseased roots samples were analyzed following standard microbiological methods for fungus extraction and purification, and for genetic studies. Irrespective of the geographical location from where the diseased samples were collected, all pathogen isolates were clustered in RAPD dendrograms as per their respective genera. Phylogram, based on multiple sequence alignment, revealed that different genera (i.e. Fusarium, Neocosmospora and Syncephalastrum), separated from each other, and species within the same genera, clustered together with their reference sequences with apreciable bootstrap values. Out of 20 representative isolates representing each cluster and all outgroups sequenced, eight were molecularly identified as Neocosmospora vasinfecta, five as Fusarium solani, two as Neocosmospora striata, two as Fusarium acutatum, one as Syncephalastrum monosporum, one as Fusarium oxysporum and one as Fusarium species. The root pathogens of the arid legumes were found neither restricted to a geographical location nor were host specific in nature. Fusarium solani wilt in cowpea and seedling rot in moth bean, F. oxysporum wilt in moth bean, F. acutatum damping off in cowpea and Clusterbean, Fusarium sp. seedling rot in Clusterbean, Neocosmospora striata root rot in cowpea and wilt in Clusterbean and Syncephalastrum monosporum root rot in Clusterbean were molecularly identified as new fungal records as pathogens causing root diseases in arid legumes. Rev. Biol. Trop. 64 (4): 1505-1518. Epub 2016 December 01.

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Section: Discussionmentioning

confidence: 99%

Molecular diagnosis and intraspecific genetic variability of root pathogens of arid legumes in Western Rajasthan, India

Gautam

Singh

Sharma

2016

RBT

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“…Fuhlbohm et al (2007) described the pathogen of peanut as N. vasinfecta var. africana in Australia which was also reported in Taiwan, China and South Korea (Huang et al 1992;Dau et al 2010;Gai et al 2011a), however Gai et al (2011b) and Sun et al (2014) reported the soybean pathogen to be N. vasinfecta var. vasinfecta.…”

Section: Research Backgroundmentioning

confidence: 76%

“…There have been reports of peanut root and pod rot caused by N. vasinfecta in Taiwan (Huang et al 1992), Vietnam (Dau et al 2010) and China (Pan et al 2010;Gai et al 2011a;Sun et al 2011a) that have reported similar symptoms in the field and after inoculation of plants under controlled conditions. Neocosmospora vasinfecta has also been reported as a pathogen of chickpea in Pakistan (Ali et al 2011) and soybean in the United States of America (Gray et al 1980;Greer et al 2015), China (Gai et al 2011b) and South Korea (Sun et al 2014).…”

Section: Research Backgroundmentioning

confidence: 93%

“…africana (Arx). Extensive crop damage caused by the disease was first reported in an irrigated peanut crop in the North Burnett region of Queensland (Fuhlbohm et al 2007) and has since been found in many other areas worldwide (Dau et al 2010;Pan et al 2010;Gai et al 2011a;Sun et al 2011a). Neocosmospora root rot is characterised by symptoms such as leaf chlorosis and wilting followed by rapid plant death and the presence of reddish-orange perithecia on the taproot and lateral root system of the plant (Fuhlbohm et al 2007).…”

Section: Research Backgroundmentioning

confidence: 99%

“…Neocosmospora root rot of peanuts is considered to be an emerging soil borne disease caused by Neocosmospora vasinfecta var. africana, a pathogen that has been reported sporadically in peanut crops in Australia (Fuhlbohm et al 2007), China (Pan et al 2010;Gai et al 2011a;Sun et al 2011a), South Africa (Baard & van Wyk 1985), India (Sakhuja & Sethi 1985), Taiwan (Huang et al 1992) and Vietnam (Dau et al 2010).…”

Section: Neocosmospora Root Rota New Soil Borne Pathogenmentioning

confidence: 99%

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Investigation into the emerging soil borne disease of peanut – Neocosmospora root rot

Wenham¹

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Neocosmospora root rot is an emerging soilborne disease of peanut (Arachis hypogaea L.) crops in Australia caused by Neocosmospora vasinfecta var. africana. The fungal pathogen was first identified in southern Queensland in 2005 following extensive damage to an irrigated peanut crop, and has since been found in all peanut growing areas in Queensland and New South Wales. Typical symptoms of the disease include extensive chlorosis and wilting of the plant starting from the main stem, and a blackened and decayed root system with reddish-orange perithecia of N. vasinfecta present on necrotic tissue of the main tap root and lateral root system as well as the pods. While the disease has been widely observed in agricultural production areas of Australia and is considered one of the most destructive pathogens of peanut, the biology, ecology and aetiology of N. vasinfecta is largely unknown therefore the biotic and abiotic factors that may influence the infectivity of the pathogen and severity of disease epidemics have not been identified. The purpose of this thesis is to investigate the biology, ecology and aetiology of N. vasinfecta var. africana and understand how these factors may contribute to the pathogenicity of the fungus.Due to limited knowledge of the biology of N. vasinfecta var. africana, a morphological and molecular approach was taken to determine the taxonomic identification and the morphological characteristics of the pathogen. The results of the morphological analysis of isolates collected from a range of peanut growing areas in Queensland identified the fungus to the species level as Neocosmospora vasinfecta. Further morphological analysis of the ascospores confirmed the characteristics of the ascospores to be consistent with the morphological description for the variety africana. Morphological analysis of isolates collected from peanut crops in Georgia were also consistent with N. vasinfecta however a MegaBlast search revealed the species variety to be vasinfecta which may account for the difference in pathogenicity seen between the two countries.Neocosmospora root rot has been identified in all peanut growing areas in Australia, however outbreaks of the disease have been sporadic and contained to isolated areas of peanut crops. An investigation into the behaviour of N. vasinfecta var. africana concluded that the fungus is likely to originate from foci of infected plants where soil inoculum is high and environmental conditions are conducive to infection, and is spread to neighbouring plants. N. vasinfecta var. africana has been identified as the most prevalent fungi isolated where plants have exhibited symptoms such as wilting, chlorosis, plant death and root decay, and therefore is considered to be a primary pathogen. There is the potential for N. vasinfecta var. africana to infect plants in conjunction with other pathogens such as peanut Tospovirus, which was evidenced by the presence of Tobacco Streak Virus (TSV) in the roots of peanut plants exhibiting symptoms of Neocosmospora root rot. Perithecia ...

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Root and collar rot disease: a new threat to young cacao (Theobroma cacao L.) plants in Sulawesi, Indonesia

Rosmana

Sjam²,

Dewi³

et al. 2022

Australasian Plant Pathol.

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First report ofNeocosmospora vasinfectaassociated with the root rot complex of peanuts in Vietnam

Cited by 7 publications

References 2 publications

Molecular diagnosis and intraspecific genetic variability of root pathogens of arid legumes in Western Rajasthan, India

Molecular diagnosis and intraspecific genetic variability of root pathogens of arid legumes in Western Rajasthan, India

Investigation into the emerging soil borne disease of peanut – Neocosmospora root rot

Root and collar rot disease: a new threat to young cacao (Theobroma cacao L.) plants in Sulawesi, Indonesia

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