scholarly journals The hijacking of a receptor kinase–driven pathway by a wheat fungal pathogen leads to disease

2016 ◽  
Vol 2 (10) ◽  
pp. e1600822 ◽  
Author(s):  
Gongjun Shi ◽  
Zengcui Zhang ◽  
Timothy L. Friesen ◽  
Dina Raats ◽  
Tzion Fahima ◽  
...  
Keyword(s):  
Fungal Pathogen ◽  
Positional Cloning ◽  
Pathogen Resistance ◽  
Complex Nature ◽  
Receptor Kinase ◽  
Necrotrophic Pathogen ◽  
Biotrophic Pathogen ◽  
Biotrophic Pathogens ◽  
Parastagonospora Nodorum ◽  
Susceptibility And Resistance

Necrotrophic pathogens live and feed on dying tissue, but their interactions with plants are not well understood compared to biotrophic pathogens. The wheatSnn1gene confers susceptibility to strains of the necrotrophic pathogenParastagonospora nodorumthat produce the SnTox1 protein. We report the positional cloning ofSnn1, a member of the wall-associated kinase class of receptors, which are known to drive pathways for biotrophic pathogen resistance. Recognition of SnTox1 bySnn1activates programmed cell death, which allows this necrotroph to gain nutrients and sporulate. These results demonstrate that necrotrophic pathogens such asP. nodorumhijack host molecular pathways that are typically involved in resistance to biotrophic pathogens, revealing the complex nature of susceptibility and resistance in necrotrophic and biotrophic pathogen interactions with plants.

Characteristics of a disease of Sphagnum fuscum caused by Scleroconidioma sphagnicola

2001 ◽  
Vol 79 (10) ◽  
pp. 1217-1224 ◽  
Author(s):  
A Tsuneda ◽  
M H Chen ◽  
R S Currah
Keyword(s):  
Cell Wall ◽  
Fungal Pathogen ◽  
Infected Leaf ◽  
Disease Development ◽  
Cortical Cells ◽  
Necrotrophic Pathogen ◽  
Sphagnum Fuscum ◽  
Entire Plant ◽  
Host Cell Wall ◽  
Advanced Stages

Scleroconidioma sphagnicola Tsuneda, Currah & Thormann, a dematiaceous hyphomycetous fungus, was found to cause a disease of Sphagnum fuscum (Schimp.) Klinggr. Hyphae of S. sphagnicola penetrated into chlorophyllose cells of host leaves and caused degeneration of chloroplasts, resulting in chlorosis of the infected leaves. Parasite hyphae often grew inside the host cell wall, and cavities were created around the hyphae. The invaded cell wall of Sp. fuscum appeared swollen and showed wavy deformation. In advanced stages of disease development, infected leaf chlorophyllose cells and stem cortical cells were necrotic and the entire plant became brown, shriveled, and brittle. Hyphae of S. sphagnicola began to form microsclerotia during early stages of disease development. Microsclerotia either formed conidiogenous cells on their surface or remained metabolically inactive and did not form conidiogenous cells. It was concluded that S. sphagnicola is a necrotrophic pathogen of Sp. fuscum, and its morphological and phenological features show remarkable adaptations for dispersal and colonization as a pathogen in bog habitats.Key words: moss, fungal pathogen, pathogenesis, chlorosis, necrosis, microsclerotia.

scholarly journals Near-Complete Genome Assembly of Alternaria brassicae—A Necrotrophic Pathogen of Brassica Crops

2019 ◽  
Vol 32 (8) ◽  
pp. 928-930 ◽  
Author(s):  
Sivasubramanian Rajarammohan ◽  
Deepak Pental ◽  
Jagreet Kaur
Keyword(s):  
Genome Assembly ◽  
Fungal Pathogen ◽  
Complete Genome ◽  
Alternaria Brassicae ◽  
Necrotrophic Pathogen ◽  
Alternaria Blight ◽  
Brassica Crops ◽  
Genome Information ◽  
Important Disease ◽  
Chromosome Level

Alternaria brassicae, a necrotrophic fungal pathogen, causes Alternaria blight, an important disease of brassica crops. Although many Alternaria spp. have been sequenced, no genome information is available for A. brassicae, a monotypic lineage within the Alternaria genus. A highly contiguous genome assembly of A. brassicae has been generated using Nanopore MinION sequencing with an N50 of 2.98 Mb, yielding nine full chromosome-level sequences. This study adds to the current genomic resources available for the genus Alternaria and will provide opportunities for further analyses to unravel the mechanisms underlying pathogenicity of this important necrotrophic pathogen.

scholarly journals Wheat receptor-kinase-like protein Stb6 controls gene-for-gene resistance to fungal pathogen Zymoseptoria tritici

2018 ◽  
Vol 50 (3) ◽  
pp. 368-374 ◽  
Author(s):  
Cyrille Saintenac ◽  
Wing-Sham Lee ◽  
Florence Cambon ◽  
Jason J. Rudd ◽  
Robert C. King ◽  
...  
Keyword(s):  
Fungal Pathogen ◽  
Receptor Kinase ◽  
Zymoseptoria Tritici ◽  
Gene For Gene
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