New insights into the life cycle of the wheat powdery mildew: direct observation of ascosporic infection in Blumeria graminis f. sp. tritici
Article
Article Title | New insights into the life cycle of the wheat powdery mildew: direct observation of ascosporic infection in Blumeria graminis f. sp. tritici |
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ERA Journal ID | 2639 |
Article Category | Article |
Authors | Jankovics, Tünde (Author), Komaromi, Judit (Author), Fabian, Attila (Author), Jager, Katalin (Author), Vida, Gyula (Author) and Kiss, Levente (Author) |
Journal Title | Phytopathology: International Journal of the American Phytopathological Society |
Journal Citation | 105 (6), pp. 797-804 |
Number of Pages | 8 |
Year | 2015 |
Publisher | American Phytopathological Society |
Place of Publication | United States |
ISSN | 0031-949X |
1943-7684 | |
Digital Object Identifier (DOI) | https://doi.org/10.1094/PHYTO-10-14-0268-R |
Web Address (URL) | http://apsjournals.apsnet.org/doi/abs/10.1094/PHYTO-10-14-0268-R |
Abstract | Although Blumeria graminis is an intensively studied pathogen, an important part of its life cycle (namely, the way ascospores initiate primary infections on cereal leaves) has not yet been explored in detail. This study reports, for the first time, the direct observation of this process in B. graminis f. sp. tritici using light and confocal laserscanning microscopy. All the germinated ascospores produced a single germ tube type both in vitro and on host plant surfaces; therefore, the ascosporic and conidial germination patterns are markedly different in this fungus, in contrast to other powdery mildews. Germinated ascospores penetrated the epidermal cells of wheat leaves and produced haustoria as known in the case of conidial infections. This work confirmed earlier studies reporting that B. graminis chasmothecia collected from the field do not contain mature ascospores, only asci filled with protoplasm; ascospore development is induced by moist conditions and is a fast process compared with other powdery mildews. Although ascosporic infections are frequent in B. graminis f. sp. tritici in the field, as shown by this study and other works as well, a recent analysis of the genomes of four isolates revealed the signs of clonal or near-clonal reproduction. Therefore, chasmothecia and ascospores are probably more important as oversummering structures than genetic recombination factors in the life cycle of this pathogen. |
Keywords | Blumeria graminis; Blumeria graminis f. sp. tritici; Erysiphales; Fungi; Triticum aestivum; Ascomycetes; cereal; cytology; fungus spore; genetics; microbiology; physiology; plant disease; plant leaf; wheat; Ascomycota; cereals; plant diseases; plant leaves; spores, fungal; Triticum |
ANZSRC Field of Research 2020 | 310705. Mycology |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Hungarian Academy of Sciences, Hungary |
Centre for Agricultural Research, Hungary | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q422v/new-insights-into-the-life-cycle-of-the-wheat-powdery-mildew-direct-observation-of-ascosporic-infection-in-blumeria-graminis-f-sp-tritici
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