Conidium morphology of Curvularia geniculata and allied species

Hosokawa, Munetaka; Tanaka, Chihiro; Tsuda, Mitsuya

doi:10.1007/s10267-003-0103-6

Cited by 12 publications

(14 citation statements)

References 13 publications

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“…Intraspecific variation within the C. geniculata population Intraspecific variation was found within the C. geniculata population, including groups formerly treated as the separate species C. affinis, C. fallax, and C. senegalensis (Hosokawa et al 2003). Among C. geniculata populations, the maximum intraspecific genetic distance was 0.0137.…”

Section: Brn1 Dna Sequencesmentioning

confidence: 98%

“…They were grown on modified V-8 juice agar (Tsuda and Ueyama 1987) or complete agar medium (CM) (Shimizu et al 1997) in slant cultures maintained at 25°C. Conidial morphology of representative isolates was shown in the previous report (Hosokawa et al 2003). Species or isolates with protuberant hilum conidia and C. robusta isolates used in this study are shown in Figs.…”

Section: Isolates and Media Usedmentioning

confidence: 99%

“…However, the conidial morphology available for species separation is sparse, and the practical identification of the species is difficult mainly because of the inconsistency and variability within an isolate and among isolates depending on conditions. Thus, the species delimitation is sometimes arbitrary and vague (Upsher 1975;Tsuda andUeyama 1982, 1983;Hosokawa et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…C.V. Subram. were crossed with tester isolates of C. geniculata, they produced fertile ascocarps (Hosokawa et al 2003); this means that these species are conspecific because there is no reproductive isolation. This method is considered to be useful for the delimitation of the species (Tsuda and Ueyama 1987).…”

Section: Introductionmentioning

confidence: 99%

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Species separation in Curvularia “geniculata” group inferred from Brn1 gene sequences

et al. 2003

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Brn1, a reductase gene involved in the melanin biosynthetic pathway, was adopted for species delimitation among members in the "geniculata" group of Curvularia species and proved to be useful for this purpose. Phylogenetic trees of these fungal members were constructed from nucleotide sequences of this region. The so-called geniculata group of Curvularia was separated into several clusters. The conidial morphology of the members in each cluster is closely similar but clearly different among discrete clusters. The phylogenetic groups almost concurred with the morphological grouping. Thus, the synonymous treatment of Curvularia affinis, C. fallax, and C. senegalensis to C. geniculata in a previous study was supported. The isolates with warping hilum conidia were clearly different from C. geniculata and separated into two clusters. C. geniculata ATCC 6671 made an independent cluster situated near these clusters. The protuberant hilum species were located separately in the phylogenetic trees. For sound taxonomic treatment of these isolates, we should accumulate more information and retain our species determination for them.

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Section: Brn1 Dna Sequencesmentioning

confidence: 98%

Section: Isolates and Media Usedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Species separation in Curvularia “geniculata” group inferred from Brn1 gene sequences

et al. 2003

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“…However, the above treatments were all based on morphology, and the genus has not been well examined using modern protocols. The classical identification of Cochliobolus and its anamorphs has encountered some problems due to the plasticity of morphological traits under different growth conditions (Old & Roberston, 1969;Hosokawa et al, 2003). We predict that new molecular developments will lead to a rearrangement of taxa at the specific or subspecific level in the near future.…”

Section: Cochliobolus and Its Anamorphsmentioning

confidence: 99%

The need to carry out re-inventory of plant pathogenic fungi

Cai¹,

Udayanga²,

Manamgoda³

et al. 2011

Trop. plant pathol.

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OUTLINEPlant pathogenic fungi have long been documented through concerted efforts of mycologists and plant pathologists; these records have served as the basis for regional and countrywide checklists which have since been put into databases listing hosts and associated fungi. They are used by governments and scientists to formulate trade quarantine policies and determine research funding, such as in plant breeding programs and disease control. With the ability to use molecular characters to study the systematics of fungi it is clear that morphologically defined species are often large complexes comprised of genetically and biologically distinct species. Use of molecular techniques to examine species complexes has revealed cryptic species in many important plant pathogenic genera, e.g. Botryosphaeria, Colletotrichum, Fusarium, and Mycosphaerella. It has occurred to such an extent that existing checklists and databases need updating. It is important that the data from these studies, including changes in taxonomy and nomenclature, be incorporated into the databases of plant pathogenic fungi to support accurate plant quarantine decisions. In addition, epitypifying fungi by re-collecting material from type habitats and isolating the organism into pure culture will provide essential materials for systematics studies to further clarify the taxonomy and phylogeny of plant pathogenic fungi. Overall, we conclude that disease lists are likely to be highly outdated and advocate the need for countrywide re-inventory of plant pathogens. As a result of these studies, tools can be developed that use morphological or molecular characters, or both, to promote accurate identification of plant pathogenic fungi.

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