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Pseudocercospora crotalariigena sp. nov. a-d. Conidia with narrowly truncate base; e-f. Catenate and branched conidia; g-h. Conidia showing obtuse tip and broad truncate base; i. A Germinating conidium; j. A curved long conidium; k. A broadly fusoid conidium; l. Conjugating conidia; m. An obclavate conidium; n-o. Fascicle of conidiophores; p. Fascicle of conidiophores and a conidiophore bearing cynlidrical to dentate terminal and lateral conidiogenous cells. Scale bar: a-p = 20 μm.
Source publication
A new species of Pseudocercospora is described causing leaf spot disease on Crotalaria assamica from India. The identity of
isolate was based on asexual morphs, cultural characteristics and phylogenetic analyses of partial nuclear ribosomal 28S large subunit
and complete internal transcribed spacer rDNA sequence data with high statistical support v...
Citations
... The area is recognized to be one of the best regions for the rich and varied occurrence of parasitic fungi particularly of cercosporoid forms. In the last few years, some foliicolous fungi were collected, described and illustrated from the forest flora of Vindhya Range (Singh, 2012;Kumar et al., 2013;Singh et al., 2014;Singh et al., 2021, Singh et al., 2022a, 2022b. During October 2020, a study was conducted to explore the cercosporoid fungi in the forest of Vindhya Range. ...
Pseudocercospora morigena (Mycosphaerellaceae, Mycosphaerellales) was discovered causing severe foliar leaf spot disease of Morus alba. Identity of the new species is based on morphology, culture characteristics and molecular analyses from three gene regions, internal transcribed spacer regions with intervening 5.8S nrRNA gene (ITS), translation elongation factor 1-alpha gene (TEF1-α) and actin gene (ACT). Morphologically, the present species differs from the allied species reported on the same host genus by the presence of superficial mycelium giving rise to solitary conidiophore, stromata filling stomatal opening and geniculate conidiophores.
... Based on multi-gene phylogenetic analysis, Crous et al. (2013) proved that Pseudocercospora species are host specific with a few exceptions. Presently, the phylogenetic analysis based on multigene sequence data is being used to understand the regional diversity and describe new species of Pseudocercospora (Bakhshi et al. 2014;Nakashima et al. 2016;Shivas et al. 2015;Park et al. 2015;Singh et al. 2021;Yadav et al. 2021;Meswaet et al. 2021). ...
... The presented phylogenetic tree was obtained with the maximum likelihood approach. Finally, the tree reconstruction, visualization and editing were done with FIGTREE v1.4.4 (Rambaut 2018) and TreeGraph_2.14.0 (Stöver& Müller (2010) (Crous et al. 2013;Singh et al. 2021;Yadav et al. 2021). The phylogenetic tree constructed with concatenated data set LSU, ITS, ACT and TEF1α showed that Ps. rauvolfiicola is separated from other Pseudocercospora species with Pseudocercospora chengtuensis strain CBS 131924, as closely related species with high bootstrap values and high Bayesian posterior probability (ML: 83%, MP: 87%, PP: 0.99). ...
A new species of Pseudocercospora is discovered causing foliar disease on the medicinal plant Rauvolfia serpentina (Apocynaceae) from India. The new species is described and illustrated on the morphology of asexual-morphs, growth characters and multigene phylogeny. Morphologically, new species has similar characters with allied species in Pseudocercospora but differs in having catenate and branched conidia. Phylogenetic analysis using combined LSU, ITS, ACT and TEF1α data supports the isolate to be a new species of Pseudocercospora (Capnodiales, Mycosphaerellaceae).
Abstract
Pseudocercospora haldinae, a new anamorphic foliicolous hyphomycetous fungus discovered on living leaves of Haldina
cordifolia (Rubiaceae) is taxonomically described and illustrated. This species is compared with closely related species
of Pseudocercospora and other dematiaceous cercosporoid forms reported on the same host genus. The phylogeny of this
species has been inferred from partial nuclear ribosomal 28S large subunit (LSU) and complete internal transcribed spacer
(ITS) rDNA sequence data. On the basis of LSU, P. haldinae represents characteristic features of Pseudocercospora s. str.
and did not form red crystals when cultivated on agar media.
Keywords: anamorph, phylogeny, plant disease, taxonomic novelty
