Quinoxyfen perturbs signal transduction in barley powdery mildew (Blumeria graminis f.sp. hordei).
SUMMARY Quinoxyfen is a protectant fungicide which controls powdery mildew diseases by interfering with germination and/or appressorium formation. Mutants of barley powdery mildew, Blumeria graminis f.sp. hordei, which are resistant to quinoxyfen produce fewer conidia, which germinate and form appre...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2003
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| _version_ | 1826269752580898816 |
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| author | Wheeler, I Hollomon, D Gustafson, G Mitchell, J Longhurst, C Zhang, Z Gurr, S |
| author_facet | Wheeler, I Hollomon, D Gustafson, G Mitchell, J Longhurst, C Zhang, Z Gurr, S |
| author_sort | Wheeler, I |
| collection | OXFORD |
| description | SUMMARY Quinoxyfen is a protectant fungicide which controls powdery mildew diseases by interfering with germination and/or appressorium formation. Mutants of barley powdery mildew, Blumeria graminis f.sp. hordei, which are resistant to quinoxyfen produce fewer conidia, which germinate and form appressoria more promiscuously than do the prolific numbers of wild-type spores. This suggests that resistance bypasses host recognition signals. RT-PCR profiles of signal transduction genes, recorded during wild-type germling morphogenesis, reveals that quinoxyfen alters the accumulation of Protein Kinase C (pkc), pkc-like and catalytic subunit of Protein Kinase A (cpka) transcripts. Differential display-reverse transcription PCR identified a gene transcript in wild-type conidia that was absent, or much less abundant, in conidia from quinoxyfen-resistant mutants. This mRNA was not detectable 24 h after wild-type conidia were inoculated on to barley. It encodes a GTPase activating protein (GAP), which may interact with a small molecular weight Ras-type GTP binding protein. In the presence of quinoxyfen, the gap mRNA remains throughout germling morphogenesis. The involvement of GAP in resistance suggests that quinoxyfen inhibits mildew infection by disrupting early cell signalling events. |
| first_indexed | 2024-03-06T21:30:02Z |
| format | Journal article |
| id | oxford-uuid:44623a27-ac91-479e-9a8b-d961d8891a29 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:30:02Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | oxford-uuid:44623a27-ac91-479e-9a8b-d961d8891a292022-03-26T15:01:12ZQuinoxyfen perturbs signal transduction in barley powdery mildew (Blumeria graminis f.sp. hordei).Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:44623a27-ac91-479e-9a8b-d961d8891a29EnglishSymplectic Elements at Oxford2003Wheeler, IHollomon, DGustafson, GMitchell, JLonghurst, CZhang, ZGurr, SSUMMARY Quinoxyfen is a protectant fungicide which controls powdery mildew diseases by interfering with germination and/or appressorium formation. Mutants of barley powdery mildew, Blumeria graminis f.sp. hordei, which are resistant to quinoxyfen produce fewer conidia, which germinate and form appressoria more promiscuously than do the prolific numbers of wild-type spores. This suggests that resistance bypasses host recognition signals. RT-PCR profiles of signal transduction genes, recorded during wild-type germling morphogenesis, reveals that quinoxyfen alters the accumulation of Protein Kinase C (pkc), pkc-like and catalytic subunit of Protein Kinase A (cpka) transcripts. Differential display-reverse transcription PCR identified a gene transcript in wild-type conidia that was absent, or much less abundant, in conidia from quinoxyfen-resistant mutants. This mRNA was not detectable 24 h after wild-type conidia were inoculated on to barley. It encodes a GTPase activating protein (GAP), which may interact with a small molecular weight Ras-type GTP binding protein. In the presence of quinoxyfen, the gap mRNA remains throughout germling morphogenesis. The involvement of GAP in resistance suggests that quinoxyfen inhibits mildew infection by disrupting early cell signalling events. |
| spellingShingle | Wheeler, I Hollomon, D Gustafson, G Mitchell, J Longhurst, C Zhang, Z Gurr, S Quinoxyfen perturbs signal transduction in barley powdery mildew (Blumeria graminis f.sp. hordei). |
| title | Quinoxyfen perturbs signal transduction in barley powdery mildew (Blumeria graminis f.sp. hordei). |
| title_full | Quinoxyfen perturbs signal transduction in barley powdery mildew (Blumeria graminis f.sp. hordei). |
| title_fullStr | Quinoxyfen perturbs signal transduction in barley powdery mildew (Blumeria graminis f.sp. hordei). |
| title_full_unstemmed | Quinoxyfen perturbs signal transduction in barley powdery mildew (Blumeria graminis f.sp. hordei). |
| title_short | Quinoxyfen perturbs signal transduction in barley powdery mildew (Blumeria graminis f.sp. hordei). |
| title_sort | quinoxyfen perturbs signal transduction in barley powdery mildew blumeria graminis f sp hordei |
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