Enhanced defense responses of tomato plants against late blight pathogen Phytophthora infestans by pre-inoculation with rhizobacteria

Yongjun An, Seogchan Kang, Ki Deok Kim, Byung Koo K. Hwang, Yongchull Jeun

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The efficacy of resistance in tomato plants, induced by rhizobacteria isolated from Jeju Island in Korea, against late blight disease caused by Phytophthora infestans was tested. Among the bacterial isolates tested, pre-inoculation with four isolates induced an effective defense against late blight. The four isolates, TRH423-3, TRH427-2, KRJ502-1 and KRY505-3, were identified as Burkholderia gladioli, Miamiensis avidus, Acinetobacter quenomosp and Bacillus cereus, respectively, by sequencing the ribosomal intergenic spacer region. They also promoted the growth of tomato seedlings. To illustrate resistance mechanisms, the infection process by P. infestans was examined using a fluorescence microscope. There were no noticeable differences in the rate of germination and appressorium formation between the untreated and pre-inoculated plants. However, callose was more frequently formed at the penetration sites on the leaves of pre-inoculated plants than the untreated plants, suggesting that these rhizobacterial isolates induce defense responses against P. infestans.

Original languageEnglish
Pages (from-to)1406-1412
Number of pages7
JournalCrop Protection
Volume29
Issue number12
DOIs
Publication statusPublished - 2010 Dec

Keywords

  • Callose
  • Hypersensitive reaction
  • Induced systemic resistance (ISR)
  • Resistance mechanism
  • Tomato

ASJC Scopus subject areas

  • Agronomy and Crop Science

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