Growth, sporulation and conidial characteristics of five graminicolous species of Helminthosporium

Kafi, A.; Tarr, S. A. J.

doi:10.1016/s0007-1536(66)80067-0

Cited by 13 publications

(5 citation statements)

References 4 publications

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“…Exserohilum rostratum was an exceptional case, where this species is shown as conspecific to E. antillanum , E. gedarefense , E. longirostratum , E. macginnisii , E. prolatum and H. leptochloae . Morphological variability in conidial shape, size and pigmentation of E. rostratum has been already noticed in natural substrate (Drechsler 1923), as well as in culture, which is influenced by external factors like carbon source, glucose concentration, type of culture media, light exposure and pH, among others (Mitra 1931, Kafi & Tarr 1966, Tarr & Kafi 1968, Leonard 1976, Anahosur & Sivanesan 1978, Honda & Aragaki 1978). Previously, Leonard & Suggs ( 1974) observed morphological similarities among E. rostratum , H. leptochloae and E. longirostratum .…”

Section: Discussionmentioning

confidence: 93%

Multi-locus phylogeny and taxonomy of Exserohilum

Hernández-Restrepo

Madrid

Tan³

et al. 2018

persoonia

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Exserohilum includes a number of plant pathogenic, saprobic and clinically relevant fungi. Some of these species are of great importance in human activities, but the genus has never been revised in a phylogenetic framework. In this study, we revise Exserohilum based on available ex-type cultures from worldwide collections, observation of the holotypes and/or protologues, and additional isolates from diverse substrates and geographical origins. Based on nine nuclear loci, i.e., ITS, LSU, act, tub2, cam, gapdh, his, tef1 and rpb2, as well as phenotypic data, the genus and species boundaries are assessed for Exserohilum. Three species, i.e., E. novae-zelandiae, E. paspali and E. sorghicola, are excluded from the genus and reallocated in Sporidesmiella and Curvularia, respectively, whereas E. heteropogonicola and E. inaequale are confirmed as members of Curvularia. Exserohilum rostratum is revealed as conspecific with species previously described in Exserohilum such as E. antillanum, E. gedarefense, E. leptochloae, E. longirostratum, E. macginnisii and E. prolatum. Additionally, E. curvatum is revealed as synonym of E. holmii, and E. fusiforme of E. oryzicola. A total of 11 Exserohilum phylogenetic species are described, illustrated and discussed, including one novel taxon, E. corniculatum. The placements of 15 other doubtful species are discussed, and E. elongatum is validated.

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Section: Discussionmentioning

confidence: 93%

Multi-locus phylogeny and taxonomy of Exserohilum

Hernández-Restrepo

Madrid

Tan³

et al. 2018

persoonia

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“…Drechslera, Bipolaris, and Exserohilum species vary greatly in the number of conidia that they produce and in their size, shape, color, and number of septa. Factors such as pH, nitrogen source and concentration, carbon source and concentration, relative humidity, photoperiod, light wavelength and intensity, and temperature influence these conidial characteristics (3,11,23,28). Either 15% V-8 juice agar or potato glucose agar should be used in studies of this group of dematiaceous fungi because these media stimulate conidial production.…”

Section: Resultsmentioning

confidence: 99%

Emerging agents of phaeohyphomycosis: pathogenic species of Bipolaris and Exserohilum

McGinnis¹,

Rinaldi²,

Winn³

1986

J Clin Microbiol

175

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Study of numerous living isolates of Bipolaris, Drechslera, Exserohilum, and Helminthosporium spp., as well as a mycological assessment of published case reports of phaeohyphomycosis attributed to these fungi, showed that Bipolaris australiensis, B. hawaiiensis, B. spicifera, Exserohilum longirostratum, E. mcginnisii, and E. rostratum are well-documented pathogens. Conidial shape, septation, and size, hilar characteristics, the origin of the germ tube from the basal cell and, to a lesser extent, from other conidial cells, and the sequence and location of the conidial septa are useful criteria for distinguishing these taxa.

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“…Various workers (Tsuda & Ueyama, 1969; Harding, 1975a,> 1b; Vakalounakis & Christias, 1981; Vakalounakis et al . 1982; Vakalounakis & Christias, 1985; Simmons, 1993, 1994; Kafi & Tarr, 1966) have shown that the morphology of conidia is governed by environmental factors, the chemical constituents of the medium, intensity of light, duration of light, relative humidity, pH, ambient temperature, etc. Traditional mycologists have used the morphology of conidia and conidiophores as criterion in delimiting species of Fungi Imperfecti (Vakalounakis & Christias, 1985).…”

Section: Resultsmentioning

confidence: 99%

Time‐Dependent Sporulation, Conidial Size and Germ Tube Formation in Alternaria tenuissima (Kunze ex Pers.) Wiltshire on Different Media

Sarma¹

2000

Journal of Phytopathology

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Time‐dependent sporulation, conidial size and germ tube formation in Alternaria tenuissima (Kunze ex Pers.) Wiltshire on different media were studied. The results indicate that maximum number of first spore was formed on potato dextrose agar (PDA) and new leaf extract of pigeon pea followed by old leaf extract of pigeon pea and distilled water (DW). The sporulation was relatively poor on other media. The maximum number of spores in a chain were produced on PDA and albumen +0.9% sodium citrate. Only one spore was seen in DW. According to time‐dependent sporulation, the media were divided into three categories: on some media the first spore was formed in 18 h, in another group it took 30–36 h and in the third group the first conidium was formed after 40 h. Four germ tubes were commonly formed on most of the media. The largest conidia were observed on potato dextrose and the smallest ones were seen on DW.

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Growth, sporulation and conidial characteristics of five graminicolous species of Helminthosporium

Cited by 13 publications

References 4 publications

Multi-locus phylogeny and taxonomy of Exserohilum

Multi-locus phylogeny and taxonomy of Exserohilum

Emerging agents of phaeohyphomycosis: pathogenic species of Bipolaris and Exserohilum

Time‐Dependent Sporulation, Conidial Size and Germ Tube Formation in Alternaria tenuissima (Kunze ex Pers.) Wiltshire on Different Media

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