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The objective of this study was to find features in microcyclic rust fungi (Uredinales) on wild host plants favorable for
extension of the natural range of distribution. Puccinia glechomatis, a leptosporic rust fungus and its herbal host Glechoma hederacea (Lamiaceae), both natives to Eurasia and introduced in North America, were used for this study. Although the host has been
known from North America since the beginning of the nineteenth century, the rust fungus was first observed there only in recent
years. Favorable features were identified by studying the life cycle of the rust, including nuclear conditions and seasonal
characteristics as well as its spread in North America. The life cycle was studied macroscopically by inoculation experiments,
by various light microscope techniques, and by scanning electron microscopy. The spread of the pathogen and its host were
reconstructed by evaluating host plant herbarium specimens and databases, literature, and field study data. The studies on
P. glechomatis show that, generally for microcyclic rust fungi, establishment and potential for spread are based on several favorable features
of both the host (e.g., synanthropic occurence and dispersal, genetic stability, regeneration of vegetative plant parts) and
the rust fungus (asexual reproduction/genetic stability, homothallism, propagation with host plant, formation of both leptospores
and thick-walled teliospores). 相似文献
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Markus Scholler Anke Schmidt Jamjan Meeboon Uwe Braun Susumu Takamatsu 《Mycoscience》2018,59(1):85-88
Since the mid-nineties Phyllactinia fraxini has become frequent in Germany. This species has hitherto been characterized by having straight conidiophore foot cells. However, we found that recent collections from Germany have conidiophores with sinuated and twisted foot cells. So far sinuated foot cells were only known from the related P. fraxinicola, another species with Eastern Asian origin. We thus hypothesized that recent collections from Germany belong to P. fraxinicola which might have been introduced to Europe. Using morphological and molecular rDNA data we found that no introduction took place and that there is only P. fraxini in Germany. 相似文献
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