Abstract
Production of antimicrobial metabolites known as phytoalexins is considered as one of the initial and main barriers to inhibit pathogen development in local infected aerial tissues. Capsidiol is the main bicyclic sesquiterpene phytoalexin in tobacco (Nicotiana tabacum) and chili pepper (Capsicum annuum). Production of 5-epi-aristolochene by the corresponding sesquiterpene cyclase enzymes is considered the critical step in capsidiol biosynthesis. To analyze the transcriptional activation of chili pepper 5-epi-aristolochene synthase gene expression in response to several pathogen-associated molecular patterns, a 1,455 bp promoter fragment upstream start codon was fully sequenced and fused to β-glucuronidase reporter gene. Analyses of spatial and temporal patterns of hybrid gene expression were carried out in transgenic tobacco plants. Surprisingly β-glucuronidase was detected in both, the locally treated and the phylotactically adjacent leaves. A particular systemic gene expression was localized in the immediate vascular tissue. The activation patterns of 5-epi-aristolochene synthase transcripts and detection of capsidiol in corresponding tobacco and pepper systemic leaves confirmed these results. This expression pattern might be mediated by reactive oxygen species. This is the first report of a highly localized systemic gene expression of enzymes directly involved in sesquiterpene phytoalexin biosynthesis in leaves, elicited by pathogen-associated molecular patterns.
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Abbreviations
- CFU:
-
colony-forming units
- DAB:
-
3, 3′-diaminobenzidine
- FPP:
-
farnesyl diphosphate
- GUS:
-
β-glucuronidase reporter gene
- HMGR:
-
3-hydroxy-3-metylglutaryl CoA reductase
- HR:
-
hypersensitive response
- JA:
-
jasmonic acid
- MAPK:
-
mitogen-activated protein kinase
- PAMPs:
-
pathogen-associated molecular patterns
- PCD:
-
programmed cell death
- PEAS :
-
5-epi-aristolochene synthase gene
- PR:
-
pathogenesis-related proteins
- ROS:
-
reactive oxygen species
- SAR:
-
systemic acquired resistance
- TEAS:
-
tobacco 5-epi-aristolochene synthase gene
- UBC2:
-
ubiquitin conjugating enzyme gene
- PAL:
-
phenylalanine ammonia lyase
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Maldonado-Bonilla, L.D., Betancourt-Jiménez, M. & Lozoya-Gloria, E. Local and systemic gene expression of sesquiterpene phytoalexin biosynthetic enzymes in plant leaves. Eur J Plant Pathol 121, 439–449 (2008). https://doi.org/10.1007/s10658-007-9262-1
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DOI: https://doi.org/10.1007/s10658-007-9262-1