Pythium zingiberum Causing Rhizome Rot of Ginger Plant and Its Distribution

Ichitani, Takio; Shinsu, Toshinori

doi:10.3186/jjphytopath.46.435

Cited by 7 publications

(9 citation statements)

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“…A reference isolate of P. zingiberis NBRC30817 (NBRC30817) which was morphological confirmed by Ichitani and Shinsu (1980) Dhingra and Sinclair (1995). The culture on the CMA was then submerged in autoclaved distilled water (DW) and stored at room temperature.…”

Section: Pythium Spp Culturesmentioning

confidence: 77%

“…This may have been due to the long term storage of the reference specimen. P. zingiberis NBRC30817 had a reported temperature optimum at near 34 °C (Ichitani and Shinsu, 1980), but in this study it exhibited fastest growth at 30 °C. The putative P. zingiberis isolates obtained from PSR ginger in this study grew particularly well at high temperature and exhibited best growth at 35 °C.…”

Section: Since 2007 P Myriotylum Isolates Have Been Collected From Dmentioning

confidence: 80%

“…P. butleri was originally considered as a separate taxon although based on its morphology it is quite similar to P. aphanidermatum (Drechsler, 1934). On ginger, P. aphanidermatum was recorded in China, India and Japan, but when assessed for pathogenicity on ginger in Japan in a pot trial, PSR symptoms were not observed (Ichitani and Shinsu, 1980). According to Drechsler (1934), P. butleri had a faster growth rate on media and produced larger oogonia than P. aphanidermatum.…”

Section: Pythium Spp-causal Agents Of the Soft Rot Diseasementioning

confidence: 99%

“…Hence, it is assumed that P. spinosum is either opportunistic or a postharvest pathogen of ginger. Similarly, P. ultimum was also isolated from ginger rhizomes in India and Japan, but efforts to fulfil Koch's postulates of the Japanese isolate showed that P. ultimum was non-pathogenic on ginger (Ichitani and Shinsu, 1980). This is despite the fact that the host range of P. ultimum includes many plants in many genera and the pathogen is known to be quite aggressive on seedlings of some other hosts such as cabbage (Kubota et al, 2006a, b), maize (Da Silva and Munkvold, 2010), chingensai (Tanina et al, 2004), common bean (Lucas and Griffiths, 2004), okra (Priekule, 2007), geranium (Chagnon and Belanger, 1991) and lucerne (Denman et al, 1995).…”

Section: Pythium Spp-causal Agents Of the Soft Rot Diseasementioning

confidence: 99%

“…Although P. myriotylum and P. zingiberis have been accepted as two taxa (Dick, 1990;Ichitani and Shinsu, 1980;Uzuhashi et al, 2010;Takahashi, 1954;Watanabe, 2010), their status as two distinctive species needs a re-appraisal. P. myriotylum was first described in 1943 on tomato in the USA, but has since been reported as having a wide host range worldwide (Plaats-Niterink, 1981).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of species associated with Pythium soft rot of ginger and evaluation of Pythium Oligandrum as a biocontrol

Le¹

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Section: Pythium Spp Culturesmentioning

confidence: 77%

Section: Since 2007 P Myriotylum Isolates Have Been Collected From Dmentioning

confidence: 80%

Section: Pythium Spp-causal Agents Of the Soft Rot Diseasementioning

confidence: 99%

Section: Pythium Spp-causal Agents Of the Soft Rot Diseasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of species associated with Pythium soft rot of ginger and evaluation of Pythium Oligandrum as a biocontrol

Le¹

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Phylogenetic relationships of Pythium species based on ITS and 5.8S sequences of the ribosomal DNA

et al. 1999

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The sequences of ITS regions in 30 species and two groups of the genus Pythium were resolved. In the phylogenetic trees, the species were generally divided into two clusters, referred to here as the F and S groups. The species in the two groups correspond in terms of their sporangial morphology, with the F group being filamentous/Iobulate and the S group being spherical. Genetic divergence within the F group was lower than that within the S group. Other morphological characteristics such as oogonial structure and sexual nature appeared to be unrelated to the groupings in these trees. An alignment analysis revealed common sequences to all the species and arrangements specific to each F or S group. It was found that the ITS region was a good target in designing species-specific primers for the identification and detection of Pythium species. In the tree based on 5.8S rDNA sequences, oomycetes are distantly related to other fungi but separated from algae in Chromista. Key WordsChromista; internal transcribed spacer; phylogeny; Pythium; 5.8S rDNA.Pythium is a large genus of the class Oomycetes including more than 80 species (van der Plaats-Niterink, 1981 ), some of which are important plant pathogens with worldwide distribution. The taxonomy of this genus is mainly based on the morphology of reproductive structures such as the oogonium, oospore, antheridium, and sporangium. Since Matthews (1931) and Sideris (1932) proposed the first keys for Pythium spp., several keys have been published as new species have been described. Researchers providing systematic taxonomy in the genus are Middleton (1943), Waterhouse (1967), and van der Plaats-Niterink (1981). Hendrix and Papa (1974) introduced the concept of 'species complexes' in relation to taxonomy of the genus Pythium. This is an arrangement in which the species of Pythium are lumped into 15 species groups based on their morphological characteristics. In the taxonomic keys for Pythium, the size of each structure and common morphological characteristics are taken as criteria, including: (1) the presence of sexual reproductive structures -homothallic or heterothallic; (2) the sporangial morphology-spherical, filamentous or Iobulate; (3) the oogonial wall charactersmooth or ornamental; (4) the oospore character-plerotic or aplerotic; and (5) the antheridial charactermonoclinous or diclinous, However, each author regarded different characteristics as more important. For example, Middleton (1943) used the sporangial morphology at the first branch, whereas Waterhouse (1967) frequently utilized the reproductive structure size in the separaCorresponding author. E-mail: kageyama(~cc.gifu-u.ac.jp tion of species. Van der Plaats-Niterink (1981) regarded the presence of reproductive structures and the oogonial wall character as more important criteria. These differences in the interpretation of the taxonomic value of each character have resulted in a confusing taxonomic system for the Pythium species. It is therefore necessary to determine which morphological characteristic is the ...

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Species delimitation in Pythium species complexes: the case of Pythium myriotylum Drechsler and Pythium zingiberis Takahashi

Smith²,

Aitken

2017

Mycol Progress

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Pythium zingiberum Causing Rhizome Rot of Ginger Plant and Its Distribution

Cited by 7 publications

References 0 publications

Characterization of species associated with Pythium soft rot of ginger and evaluation of Pythium Oligandrum as a biocontrol

Characterization of species associated with Pythium soft rot of ginger and evaluation of Pythium Oligandrum as a biocontrol

Phylogenetic relationships of Pythium species based on ITS and 5.8S sequences of the ribosomal DNA

Species delimitation in Pythium species complexes: the case of Pythium myriotylum Drechsler and Pythium zingiberis Takahashi

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