Journal
AUSTRALASIAN PLANT PATHOLOGY
Volume 43, Issue 6, Pages 715-726Publisher
SPRINGER
DOI: 10.1007/s13313-014-0314-7
Keywords
Barley net blotch; Net form net blotch; Virulence; Proteinaceous toxins; Xylanase
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Funding
- Grains Research and Development Corporation (GRDC)
- Iraqi Ministry of Higher Education and Scientific Research
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The barley pathogen Pyrenophora teres f. teres (Ptt) produces proteinaceous toxins that contribute to the necrotic symptoms observed during net form net blotch (NFNB) disease. To better understand the relationship between these toxins and virulence, a proteomics approach was used to identify proteins differentially expressed in a more virulent Ptt isolate. Three proteins were identified: an endo-1,4-beta-xylanase A (PttXyn11A), a cysteine hydrolase family protein (PttCHFP1) and an unknown (but conserved) secreted protein (PttSP1). PttXyn11A was homologous to a plant cell-wall degrading enzyme but also had a predicted necrosis-inducing region on the enzyme surface. PttCHFP1 showed homology to an isochorismatase, an enzyme proposed to suppress plant defence. Xylanase activity and PttXyn11A expression were greater in more virulent isolates in vitro and during the interaction respectively, suggesting that PttXyn11A plays a role in symptom development.
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