Fig 5 - uploaded by Uwe Braun
Content may be subject to copyright.
Passalora senecionicola. A-hyphae, B-conidiophore fascicles, C-conidiophores, D-conidia, bar = 10 µm, U. Braun del.
Source publication
Citations
... Nomura (Nomura 1997). Another species found in the asexual Oidium (Pseudoidium) stage only was recorded by Braun et al. (2006) for the first time on lotus in Germany, where it was considered an accidental infection under glasshouse conditions. The fungus was used to test experimentally the environmental factors that allow the unusual infection of extremely self-cleaning lotus leaves (Cerman 2007). ...
... The conidial wall structures seen with the SEM showing longitudinal striations that become more conspicuous during aging, the three minute central papillae and "fibrillar" or "basket weave pattern" at the ends were described for members of Pseudoidium by Braun et al. (2002), Cook et al. (1997), and Inman et al. (2000). The characteristics agree with those described by Braun et al. (2006) for Oidium sp. on lotus in Germany, except for the wider range of conidial width given by Braun et al. (2006) and Cerman (2007). Other records of powdery mildews on lotus are not known for Germany (Brandenburger and Hagedorn 2006). ...
... The conidial wall structures seen with the SEM showing longitudinal striations that become more conspicuous during aging, the three minute central papillae and "fibrillar" or "basket weave pattern" at the ends were described for members of Pseudoidium by Braun et al. (2002), Cook et al. (1997), and Inman et al. (2000). The characteristics agree with those described by Braun et al. (2006) for Oidium sp. on lotus in Germany, except for the wider range of conidial width given by Braun et al. (2006) and Cerman (2007). Other records of powdery mildews on lotus are not known for Germany (Brandenburger and Hagedorn 2006). ...
The powdery mildew Erysiphe magnifica (Erysiphales, Ascomycota) has been recorded for the first time on lotus (Nelumbo nucifera) based on a collection from the Botanical Garden in Frankfurt am Main, Germany. This powdery mildew previously known only
from Magnolia species was identified by a combination of light and scanning electron microscopic investigation of ascomata and the Oidium stage, and comparison of ITS DNA sequences. This finding is discussed with respect to the narrow host specificity concept
used in Erysiphales taxonomy, the effect of lotus leaf surface on fungal infection, and the extending geographical distribution
of powdery mildews.
KeywordsMicroscopy-SEM-Taxonomy
... Podosphaera negeri was first described as Sphaerotheca spi ralis in 1907 (Braun 1987) and revised as P. negeri by Braun et al. (2006). This species has a unique characteristic with coiled appendages, infects Escallonia (Escalloniaceae) and has been reported only in Argentinian Patagonia. ...
Podosphaera is a genus of the powdery mildew fungi belonging to the tribe Cystotheceae of the Erysiphaceae. Among the host plants of Podosphaera, 86 % of hosts of the section Podosphaera and 57 % hosts of the subsection Sphaerotheca belong to the Rosaceae. In order to reconstruct the phylogeny of Podosphaera and to determine evolutionary relationships between Podosphaera and its host plants, we used 152 ITS sequences and 69 28S rDNA sequences of Podosphaera for phylogenetic analyses. As a result, Podosphaera was divided into two large clades: clade 1, consisting of the section Podosphaera on Prunus (P. tridactyla s.l.) and subsection Magnicellulatae; and clade 2, composed of the remaining member of section Podosphaera and subsection Sphaerotheca. Because section Podosphaera takes a basal position in both clades, section Podosphaera may be ancestral in the genus Podosphaera, and the subsections Sphaerotheca and Magnicellulatae may have evolved from section Podosphaera independently. Podosphaera isolates from the respective subfamilies of Rosaceae each formed different groups in the trees, suggesting a close evolutionary relationship between Podosphaera spp. and their rosaceous hosts. However, tree topology comparison and molecular clock calibration did not support the possibility of co-speciation between Podosphaera and Rosaceae. Molecular phylogeny did not support species delimitation of P. aphanis, P. clandestina, P. ferruginea, P. spiraeae and P. tridactyla in their current circumscriptions, which suggests the need for revision of these species.
The article continues a series of critical reviews of the species composition of powdery mildew fungi (Erysiphaceae, Helotiales, Ascomycota) of Ukraine and their distribution within the country. This article deals with species of the section Microsphaera of the genus Erysiphe. These species are distinguished by fruiting bodies that have non-mycelioid appendages with dichotomously branched apices. A list of 36 species of the section Microsphaera recorded in Ukraine with their distribution by regions is provided, as well as a key for their identification. The most common species frequently occurring in many regions of Ukraine are E. alphitoides, E. astragali, E. berberidis, E. divaricata, E. ehrenbergii, E. euonymi, E. ornata var. europaea, E. palczewskii, E. syringae-japonicae, and E. trifoliorum. Other species, such as E. baeumleri, E. elevata, E. euonymicola, E. friesii, E. grossulariae, E. hyperici, E. hypophylla, E. ornata var. ornata, E. penicillata, E. pseudoacaciae, E. robiniae, E. syringae, E. tortilis, E. vanbruntiana, and E. viburni, were recorded less often. Erysiphe azaleae, E. begoniicola, E. corylacearum, E. deutziae, E. gorlenkoi, E. guarinonii, E. magnifica, E. magnusii, E. platani, E. rayssiae, E. russellii, and E. symphoricarpi are known only from some localities. A number of species are invasive fungi mostly recorded in Ukraine relatively recently, within the last hundred years. Of them, E. alphitoides, E. palczewskii, E. syringae-japonicae, and E. vanbruntiana have become common species in Ukraine. Erysiphe azaleae, E. elevata, and E. platani can massively develop in certain regions or localities. The recently registered E. corylacearum is apparently becoming widespread in the Carpathians, E. ravenelii and E. symphoricarpi at present frequently occur in Kyiv. Some species, such as E. begoniicola, E. deutziae, E. euonymicola, E. guarinonii, E. magnifica, and E. russellii, are known from a few localities; however, in Kyiv magnolias are commonly infected by E. magnifica. At the same time, the North American species E. syringae has disappeared in Ukraine since the East Asian fungus E. syringae-japonicae started to spread on lilac. The indigenous fungus E. robiniae has also ceased to occur on Caragana arborescens, being completely replaced by the East Asian species E. palczewskii.
In this review, we present an historic account of the work on the diversity of fungi associated with plants of the Cerrado Biome, including an overview of the studies carried out by the research group of the Mycological Collection connected to the Herbarium UB (Universidade de Brasília), and the rust fungi in Herbarium IBI (Instituto Biológico, São Paulo). The contributions to Cerrado mycology from the early 19th century to the present days were highlighted. Illustrative maps were included to show the geographical distribution of the main fungal groups, associated with native plants of the Cerrado, belonging to the five predominant orders: Pucciniales (rust fungi), Phyllachorales (tar-spot fungi), Capnodiales (cercosporoid fungi: Family Mycosphaerellaceae), as well as Meliolales and Asterinales (black mildews).
Out of 163 samples of suspected volunteer plants to fungal infection collected from different areas of Hamedan province
(W Iran), 49 isolates of the anamorphic fungi were identified according to morphological and molecular features. Based on these,
13 species were identified and classified in six genera. Most of them belonged to Cladosporium, Ascochyta and Phoma, respectively.
Among them, Embellisia astragali, E. tellustris, Phoma herbicola and Septoria sonchi on Scorzonera cana, Cirsium arvensis,
Taraxacum sp. and Sonchus oleraceous are new records for the mycoflora of Iran. To confirm morphological identification, ITS
regions (ITS1, ITS2 & 5.8 S gene) of ribosomal DNA from these species were sequenced. ITS sequences of different species of
Phoma and Embellisia were very diverse.
Understanding ecological interactions is a key in managing phytopathology. Although entomologists rely mostly on both traditional molecular methods and morphological characteristics to identify pests, next-generation sequencing is becoming the go-to avenue for scientists studying fungal and oomycete phytopathogens. These organisms sometimes infect plants together with insects. There are many relationships yet to be discovered and much to learn about how these organisms interact with one another. Considering the growing number of exotic insect introductions in Canada, a high-throughput strategy for screening those insects is already implemented by the Canadian Food Inspection Agency (CFIA). However, no plan is deployed to investigate the phytopathogenic fungal and oomycete species interacting with insects. Metagenomics analysis was performed on the preservation fluids from CFIA’s insect traps across Canada. Using the Ion Torrent PGM technology and fusion primers for multiplexing and indexing, community profiling was conducted on the different semiochemicals used in the insect traps and the various areas where these traps were placed. Internal transcribed spacer 1 (fungi and oomycetes) and adenosine triphosphate synthase subunit 9-nicotinamide adenine dinucleotide dehydrogenase subunit 9 spacer amplicons were generated. Although direct links between organisms could not be established, moderately phytopathogenic fungi (e.g., Leptographium spp. and Meria laricis) and oomycetes (mainly Peronospora spp. and Pythium spp.) unique to every type of semiochemical were discovered. The entomopathogenic yeast Candida michaelii was also detected. This project demonstrated our ability to screen for unwanted species faster and at a higher scale and throughput than traditional pathogen diagnostic techniques. Additionally, minimal modifications to this approach would allow it to be used in other phytopathology fields.
Cystotheca lanestris on the new host Quercus canbyi, Microidium bauhiniicola on the new host Bauhinia macranthera and an undescribed species of Phyllactinia on Mimosa aculeaticarpa have recently been collected in Mexico. Analyses of morphological traits and molecular sequence data led to identifications of the causal agents of the powdery mildew diseases involved. Microidium bauhiniicola, hitherto only known from Argentina and Brazil, is new to Mexico. The phylogenetic analysis revealed an isolated position distant from Microidium indicating an undescribed genus, which is introduced as Bulbomicroidium gen. nov. Sequences derived from a Mexican specimen of C. lanestris on Quercus canbyi agree completely with other North American sequences, but differ from sequences retrieved from Asian collections, suggesting that C. lanestris in Asia is not conspecific with C. lanestris s. str. in North America. A new species of Phyllactinia on Mimosa malacophylla is morphologically similar to P. dalbergiae but readily distinguishable by differences in the asexual morph. Based on morphological peculiarities and results of molecular sequence analyses, this species is described as Phyllactinia mimosae sp. nov.
In spite of the self-cleaning property of its leaves called the lotus effect, leaves of lotus (Nelumbo nucifera) provide a habitat for an unknown fungal diversity. The aim of this study was to detect and identify fungi from leaves of N. nucifera, including ectophytic, parasitic and endophytic fungi, in Taiwan using different collection strategies, as well as morphological and diverse molecular markers established in the different systematic groups of fungi. Among ectophytic and parasitic fungi, a new species of Dissoconium and of Pseudocercospora are described, respectively. Phyllosticta nelumbonis Sawada is transferred to Diaporthe. Among plant parasitic fungi, Erysiphe takamatsui and Ps. nymphaeacea are recorded in Taiwan for the first time. Euryale is recorded as a new host genus for Ps. nymphaeacea. The basidiomycetous yeast Fereydounia khargensis is recorded for the first time from living plants and in East Asia. Endophytic fungi from lotus were studied for the first time. From 1002 plant segments, 476 endophytic isolates were produced in culture, comprising 33 typical terrestrial species mainly belonging to the genera Colletotrichum (mainly C. siamense), Diaporthe (D. tulliensis and D. ueckerae) and Fusarium (F. solani species 6, hitherto known from clinical samples), as well as to Xylariaceae, but no Ingoldian fungi. Most isolates were from leaf laminas (71%) compared to those from petioles (29%). From this observation, we conclude that the fungi of the aquatic lotus plant appear to have terrestrial origin and, after dispersal by wind and in spite of the lotus effect, may enter the plant from the lamina. Only three species isolated as endophytes were also found as ectophytic or parasitic fungi.
