First report ofPhoma terrestris causing pink root rot of Chinese onion in Vietnam

Luong, Thi-Hoan; Huynh, Loi; Tran, Uyen; Dau, V. T.; Burgess, L. W.; Phan, H. T.; Aveskamp, M.M.; Vo, A. D.

doi:10.1007/bf03211273

Cited by 1 publication

(2 citation statements)

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“…These symptoms in the foliar area and root system coincide with those reported by López-López et al (2020), whereas the same causal agent affected tomato plants reported in Brazil, Canada, USA and Venezuela (Farr and Rossman, 2022). Likewise, these symptoms were reported in other hosts such as scallions (Allium fistulosum) in China (Luong et al, 2008). Similarly, the symptoms of the corky and pink root diseases coincide with those described for S. terrestris in onion (Schwartz and Mohan, 2008).…”

Section: Resultssupporting

confidence: 73%

“…In turn, Luong et al (2008) identified S. terrestris as the causal agent of pink root in onion, using characteristics of the colony and they observed the pink pigment in the culture medium, as well as the setae in the pycnidia and conidia, typical of this root in some pink roots. Additionally, large guttulates were observed in the conidia of their islates, which coincide with those reported in this study.…”

Section: Setae (µM) Pycnidium (µM) Conidia (µM) Referencementioning

confidence: 99%

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Morphological characterization, phylogeny and pathogenesis of Setophoma terrestris causing corky and pink roots of tomato (Solanum lycopersicum) in Sinaloa, Mexico

López-López,

Tovar-Pedraza,

León-Félix

et al. 2024

RMF, MJP

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Tomato (Solanum lycopersicum) is one of Mexico’s main crops. In the years 2017 and 2018, symptoms of corky and pink roots were observed with an incidence of 10 to 20% in Culiacan, Sinaloa, Mexico. In the foliage, plants presented a generalized chlorosis, with stunted growth and senescence in the leaves. In the roots, brown and pink lesions were formed, as well as a corky texture. The objective of this study was to morphologically and molecularly characterize fungal isolates associated to corky and pink root in tomato orchards in Culiacan, Sinaloa, as well as to evaluate their pathogenicity. Monoconidial isolates were obtained and they were identified as Setophoma terrestris, based on their morphological characteristics. To confirm the identity, the area of the internal transcribed spacers (ITS) of the rDNA was amplified and sequenced, along with a fragment of the gene 28S of the rRNA (LSU). Using the sequences obtained, a phylogenetic tree was created using the Bayesian Inference and it was found that the sequences were grouped with the ex–type sequences of Setophoma terrestris. The pathogenicity of the isolates was verified by inoculating mycelial discs into the root of 10 one-month-old tomato seedlings. The roots of the seedlings inoculated with PDA discs without mycelium served as a control. Thirty days after inoculation, corky and pink root symptoms appeared, whereas the roots of control plants remained healthy. According to the morphological characterization, the molecular identification and the pathogenicity tests, Setophoma terrestris was confirmed to be the causal agent of corky and pink root in agricultural tomato orchards in Culiacan, Sinaloa.

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Section: Resultssupporting

confidence: 73%

Section: Setae (µM) Pycnidium (µM) Conidia (µM) Referencementioning

confidence: 99%