Abstract
Key message
A gene encoding a coproporphyrinogen III oxidase mediates disease resistance in plants by the salicylic acid pathway.
Abstract
A number of genes that regulate powdery mildew resistance have been identified in Arabidopsis, such as ENHANCED DISEASE RESISTANCE 1 to 3 (EDR1 to 3). To further study the molecular interactions between the powdery mildew pathogen and Arabidopsis, we isolated and characterized a mutant that exhibited enhanced resistance to powdery mildew. The mutant also showed dramatic powdery mildew-induced cell death as well as growth defects and early senescence in the absence of pathogens. We identified the affected gene by map-based cloning and found that the gene encodes a coproporphyrinogen III oxidase, a key enzyme in the tetrapyrrole biosynthesis pathway, previously known as LESION INITIATION 2 (LIN2). Therefore, we designated the mutant lin2-2. Further studies revealed that the lin2-2 mutant also displayed enhanced resistance to Hyaloperonospora arabidopsidis (H.a.) Noco2. Genetic analysis showed that the lin2-2-mediated disease resistance and spontaneous cell death were dependent on PHYTOALEXIN DEFICIENT 4 (PAD4), SALICYLIC ACID INDUCTION-DEFICIENT 2 (SID2), and NONEXPRESSOR OF PATHOGENESIS-RELATED GENES 1 (NPR1), which are all involved in salicylic acid signaling. Furthermore, the relative expression levels of defense-related genes were induced after powdery mildew infection in the lin2-2 mutant. These data indicated that LIN2 plays an important role in cell death control and defense responses in plants.
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Abbreviations
- LIN2:
-
LESION INITIATION 2
- CPO:
-
Coproporphyrinogen III oxidase
- EDR1:
-
ENHANCED DISEASE RESISTANCE 1
- PAD4:
-
PHYTOALEXIN DEFICIENT 4
- SID2:
-
SALICYLIC ACID INDUCTION-DEFICIENT 2
- NPR1:
-
NONEXPRESSOR OF PATHOGENESIS-RELATED GENES 1
- EIN2:
-
ETHYLENE INSENSITIVE 2
- COI1:
-
CORONATINE-INSENSITIVE 1
- KEG:
-
KEEP ON GOING
- SR1:
-
SIGNAL RESPONSIVE1
- LMMs:
-
Lesion mimic mutants
- PCD:
-
Programmed cell death
- SA:
-
Salicylic acid
- JA:
-
Jasmonic acid
- ET:
-
Ethylene
- HR:
-
Hypersensitive response
- SAR:
-
Systemic acquired resistance
- DAB:
-
Diaminobenzidine
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This study was financially supported by the National Transgenic Program of China (Grant No. 2011ZX08005-002) and by the National Transgenic Program of China (Grant No. 2009ZX08009-036B).
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Communicated by Y. Lu.
C. Guo and G. Wu contributed equally to this work.
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Guo, Cy., Wu, Gh., Xing, J. et al. A mutation in a coproporphyrinogen III oxidase gene confers growth inhibition, enhanced powdery mildew resistance and powdery mildew-induced cell death in Arabidopsis. Plant Cell Rep 32, 687–702 (2013). https://doi.org/10.1007/s00299-013-1403-8
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DOI: https://doi.org/10.1007/s00299-013-1403-8