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Fungal flora of tropical Guangxi, China: A preliminary checklist of rust fungi

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Abstract

Sixty-nine rust species are reported from the tropical region of Guangxi Province, China, including a new species, Puccinia stenospora J.Y. Zhuang & S.X. Wei, and a new record in China, Uromyces cucullatus Syd. & P. Syd.

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... (Pucciniastraceae), Thekopsora agrimoniae Dietel (Pucciniastraceae), Uredo agrimoniae J. Schröt. (Anamorphic genera) are frequently assigned names (Tai 1979;Zhuang 1983Zhuang , 2001Zhuang , 2005Guo 1989;Zhang et al. 1997;Cao and Li 1999;Zhuang and Wei 1999;Cao et al. 2000), or in fewer cases as Melampsora agrimoniae Dietel (Melampsoraceae), Puccinia agrimoniae (Arthur) Arthur (Pucciniaceae) and Uropyxis agrimoniae Arthur (Uropyxidaceae) (Arthur 1910;Maneval 1937). ...
... The rust fungus on Agrimonia pilosa was previously frequently recognised as Pucciniastrum agrimoniae due to its ostiolar cells and subepidermal teliospores divided by vertical septa (Tai 1979;Guo 1989;Zhang et al. 1997;Cao and Li 1999;Zhuang and Wei 1999;Cao et al. 2000;Zhuang 2001Zhuang , 2005. P. agrimoniae was first described on A. pilosa from Western Siberia Borus Mountains, Altai in Russia by Tranzschel (1895). ...
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A new rust genus, Quasipucciniastrum, typified by Q. agrimoniae sp. nov., is proposed based on distinct morphological characters and phylogenetic placement. This genus is characterised by its uredinial ostiolar peridial cells with rough surface and sessile, multicellular teliospores with apparently thickened apical wall. Molecular phylogenetic analyses using internal transcribed spacer regions and intervening 5.8S nrRNA gene (ITS) and the large subunit (LSU) rDNA revealed that this genus is sister to the genus Cronartium (Cronartiaceae), but morphologically it is distinct from Cronartium in the sessile teliospores that are divided by vertical septa. Morphologically, Quasipucciniastrum should be compared to Pucciniastrum (Pucciniastraceae) in its multicellular teliospores, but they were phylogenetically distant.
... Commentary-This fungus has been recorded on species of Cinnamomum (Hiratsuka et al. 1992), Lindera (Cao et al. 2000), and Machilus (Hiratsuka et al. 1992;Zhuang and Wei 1999;Kobayashi 2007) in warm climate regions in East Asia. This is the first record of the fungus in tropical Southeast Asia. ...
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Rust fungi collected in Thailand in the past four decades were examined and identified. In this paper, we report seven species in three teleomorphic genera classified in Phakopsoraceae (Pucciniales) and four anamorphic species, whose taxonomic relationships to Phakopsoraceae are assumed. They are Cerotelium fici on Morus (Moraceae), Monosporidium machili on Machilus (Lauraceae), Phakopsora. cingens on Bridelia (Phyllanthaceae), P. elettariae on Zingiber (Zingiberaceae) and unidentified zingiberaceous plants, P. hengshanensis on Ficus (Moraceae), P. fici-erectae on Broussonetia, Ficus, and Morus (Moraceae), P. formosana on Glochidion (Phyllanthaceae), Aecidium innatum on Glochidion, U. amomi on Amomum, Curcuma, and unidentified Alpinia-like plants (Zingiberaceae), Uredo artocarpi on Artocarpus (Moraceae), and U. sawadae on Morus.
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Uromyces is the second-largest plant pathogenic rust genus, is responsible for numerous diseases, and has major effects on both agricultural and non-agricultural plants. The genus is generally characterized by its unicellular teliospores that help to characterize it and distinguish it from another important rust genus, Puccinia. In this study, a global overview of the diversity and distribution of Uromyces is presented based on both online and offline resources. The information obtained was analyzed for numerical and graphical summaries to provide the diversity and distribution of the genus by country and continent. Besides this, broad taxonomical aspects, a brief life cycle, and other comparative aspects on diversity and distribution were also provided. In addition, a phy-logenetic analysis based on the ITS and nLSU DNA sequence data available in GenBank and published literature was performed to examine the intergeneric relationships of Uromyces. The results obtained revealed that the rust genus is found distributed over 150 countries, territories, and occu-pancies of the world on around 647 plant genera belonging to 95 plant families. Phylogenetic studies based on LSU and ITS sequence data revealed that Uromyces species are polyphyletic and require more DNA-based analyses for a better understanding of their taxonomic placement.
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