<i>Pythium campanulatum</i>sp. nov., isolated from the rhizosphere of maize, its taxonomy, ITS region of rDNA, and comparison with related species

Mathew, Ritta; Singh, Kusum Kumari; Paul, Bernard

doi:10.1016/s0378-1097(03)00525-1

Cited by 11 publications

(2 citation statements)

References 16 publications

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“…Stalk rot is caused by many species of Fusarium and Pythium. F. verticillioides , F. subglutinans , and F. proliferatum are important fungi that have caused significant losses of maize in the USA [8,9,10,11]. It was reported that corn stalk rot is mainly caused by F. moniliforme in Hebei, Hubei, and Guangxi Provinces of China [12], while F. graminearum is the main pathogen in Shaanxi, Jilin, and Henan Provinces of China [13].…”

Section: Introductionmentioning

confidence: 99%

The Relationship Analysis on Corn Stalk Rot and Ear Rot According to Fusarium Species and Fumonisin Contamination in Kernels

Cao

et al. 2019

Toxins

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Fusarium diseases, including corn root rot, sheath rot, stalk rot, and ear rot are frequently occurring in maize producing areas of China. Fusarium stalk rot and ear rot are the most serious diseases and often occur at the same time, but it is unclear whether there is a correlation between Fusarium composition and disease occurrence. This study was conducted to clarify the relationship between the two diseases. A total of 49 corn stalk rot samples were collected from 15 regions of eight provinces in China from 2016 to 2018. The pathogens were isolated and identified separately from stalks, ear stems, and kernels. The contents of the fumonisins (FB1 and FB2) were detected in kernels. The results showed that the main Fusarium species were found in corn kernels, ear stems and stalks at the same time. The results showed that 1201 strains of Fusarium verticillioides, 668 strains of Fusarium oxysporum, 574 strains of Fusarium graminearum species complex (FGSC), 318 strains of Fusarium equiseti, 95 strains of Fusarium proliferatum, and 40 strains of Fusarium subglutinans were isolated from 1470 corn kernels, 245 ear stems, and 1225 stalks randomly selected from 49 samples. The contamination rate of fumonisins in the 49 samples was 57.1% with an average content of 1.9 μg/g, of which four samples exhibited higher levels as set by the European Commission (4.0 μg/g). These results provide a certain association between stalk rot and ear rot and lay a foundation to study the relationships among Fusarium maize diseases.

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Section: Introductionmentioning

confidence: 99%

The Relationship Analysis on Corn Stalk Rot and Ear Rot According to Fusarium Species and Fumonisin Contamination in Kernels

Cao

et al. 2019

Toxins

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“…Pythium species are commonly found in water and its surface sediment, sand, field soils and residual dead roots of previous crops (Mathew et al 2003). Many Pythium spp.…”

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First report of Pythium recalcitrans infecting flue-cured tobacco

Bian

Zhao

Jang

et al. 2016

Australasian Plant Dis. Notes

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In July 2014, an unknown Pythium sp. was isolated from the rhizosphere soil of flue-cured tobacco (Nicotiana tabacum) in Luoyang of China. Based on morphological characteristics and phylogenetic analysis of Inter Transcribed Spacer sequences, the pathogen was identified as Pythium recalcitrans Moralejo. The result of the pathogenicity test showed that Pythium recalcitrans could infect the seedlings of flue-cured tobacco.Keywords Pythium recalcitrans . Flue-cured tobacco . Pathogenicity Luoyang is a high quality tobacco production area in China. It belongs to the warm temperate continental monsoon climate, therefore having four distinct seasons. It experiences a large temperature difference annually with long hours of sunshine in the summer months. It is characterised with varied topography including hills, mountains and numerous rivers. Each year, nearly 20 000 ha of flue-cured tobacco are planted in hilly land. However, the diseases of flue-cured tobacco, caused by the lack of good cultivation management greatly influence the quality of flue-cured tobacco.

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Pythium rhizo-oryzae sp. nov. Isolated from Paddy Fields: Taxonomy, ITS Region of rDNA, and Comparison with Related Species

2006

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Pythium rhizo-oryzae sp. nov. was isolated from some soil samples taken in paddy fields in northeastern India. For quite a long time it was wrongly identified as Pythium catenulatum Mathews, because of the presence of numerous catenulate hyphal bodies. The sequencing of the ITS region of its nuclear ribosomal DNA and a close look at its morphological characters have now enabled us to describe it as a new species. This species is characterized by the absence of zoospores and sporangia, rarely formed aritheridia and oogonia, and the presence of chained and terminal hyphal bodies. The ITS region of its rDNA comprises 774 bases. This oomycete is closely related to the members producing a filamentous inflated type of sporangia like P. catenulatum Mathews, P. torulosum Coker & Paterson, and P. inflatum Mathews. The closest of all these is P. catenulatum. Taxonomic description of this new species and its comparison with related oomycetes, together with the sequence of the PCR amplified internal transcribed region (spacers ITS1, ITS2, and the gene 5.8S) of its rDNA are given here.

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Pythium campanulatumsp. nov., isolated from the rhizosphere of maize, its taxonomy, ITS region of rDNA, and comparison with related species

Cited by 11 publications

References 16 publications

The Relationship Analysis on Corn Stalk Rot and Ear Rot According to Fusarium Species and Fumonisin Contamination in Kernels

The Relationship Analysis on Corn Stalk Rot and Ear Rot According to Fusarium Species and Fumonisin Contamination in Kernels

First report of Pythium recalcitrans infecting flue-cured tobacco

Pythium rhizo-oryzae sp. nov. Isolated from Paddy Fields: Taxonomy, ITS Region of rDNA, and Comparison with Related Species

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