Abstract
The anthracnose fungus Colletotrichum gloeosporioides deleteriously affects unripe pepper fruit, but not ripe fruit. Here, we show that the induction of local acquired resistance (LAR) by salicylic acid (SA), 2,6-dichloroisonicotinic acid, or benzo-(1,2,3)-thiadiazole-7-carbothioic acid S-methyl ester pretreatment protects unripe pepper fruit against the fungus, while jasmonic acid (JA) does not. The SA-mediated LAR in the unripe fruit inhibited the fungal appressoria, resulting in protection against fungal infection. Microarray analysis revealed that 177 of 7,900 cDNA clones showed more than fourfold transcriptional accumulation in SA-treated unripe fruit. The reverse transcription-polymerase chain reaction showed that most of the SA-responsive genes (SRGs) were regulated by SA, but not by JA or ethylene-releasing ethephon. Furthermore, most of the SRGs were preferentially expressed in the ripe fruit. These results suggest that the SA-mediated transcriptional regulation of SRGs has a critical role in the resistance of ripe pepper fruit to fungal infection.
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Abbreviations
- LAR:
-
Local acquired resistance
- SA:
-
Salicylic acid
- INA:
-
2,6-Dichloroisonicotinic acid
- BTH:
-
Benzo-(1,2,3)-thiadiazole-7-carbothioic acid S-methyl ester
- SRGs:
-
SA-responsive genes
- JA:
-
Jasmonic acid
- ET:
-
Ethylene
- AR:
-
Acquired resistance
- SAR:
-
Systemic acquired resistance
- ISR:
-
Induced systemic resistance
- RT-PCR:
-
Reverse transcription-polymerase chain reaction
- DEPC:
-
Diethylpyrocarbonate
- DAI:
-
Day after inoculation
- PR:
-
Pathogenesis related
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Acknowledgments
This research was supported by a grant (CG1134) from the Crop Functional Genomics Center of the 21st Century Frontier Research Program funded by Ministry of Science and Technology of Korean government and a grant (Code 20070401-034-026) from BioGreen 21 Program, Rural Development Administration, Republic of Korea.
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Communicated by J. R. Liu.
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Lee, S., Hong, JC., Jeon, W.B. et al. The salicylic acid-induced protection of non-climacteric unripe pepper fruit against Colletotrichum gloeosporioides is similar to the resistance of ripe fruit. Plant Cell Rep 28, 1573–1580 (2009). https://doi.org/10.1007/s00299-009-0756-5
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DOI: https://doi.org/10.1007/s00299-009-0756-5