Journal
PLANT CELL REPORTS
Volume 28, Issue 10, Pages 1573-1580Publisher
SPRINGER
DOI: 10.1007/s00299-009-0756-5
Keywords
Local acquired resistance; cDNA microarray; Colletotrichum gloeosporioides; Non-climacteric pepper fruit; Salicylic acid-responsive gene; Fungal resistance
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Funding
- Ministry of Science and Technology of Korean government [CG1134]
- BioGreen 21 Program, Rural Development Administration, Republic of Korea [20070401-034-026]
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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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