Overexpression of lipid transfer protein (LTP) genes enhances resistance to plant pathogens and LTP functions in long-distance systemic signaling in tobacco

Sujon Sarowar, Young Jin Kim, Ki Deok Kim, Byung Kook Hwang, Sung Han Ok, Jeong Sheop Shin

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71 Citations (Scopus)


The lipid signal is essential for the activation of plant defense responses, but downstream components of the signaling pathway are still poorly defined. To investigate the biological functions of pepper lipid transfer protein (LTP), we carried out virus-induced gene silencing (VIGS) in pepper, constitutive expression of CALTPs and grafting experiments in the tobacco plant. Suppression of endogenous CALTPI and CALTPII by VIGS, respectively, resulted in enhanced susceptibility to Xanthomonas campestris pv. vescatoria and pepper mosaic mottle virus in pepper. On the other hand, the constitutive expression of CALTPI and CALTPII genes in tobacco plants showed enhanced resistance to oomycete pathogen, Phytophthora nicotianae and bacterial pathogen, Pseudomonas syringae pv. tabaci. Enhanced resistance is found to be associated with the enhanced CALTP transcript levels in the independent transgenic CALTPI or II tobacco lines. Induced resistance responses in grafted scion leaves revealed that LTP plays a role in long-distance systemic signaling in plants.

Original languageEnglish
Pages (from-to)419-427
Number of pages9
JournalPlant Cell Reports
Issue number3
Publication statusPublished - 2009 Mar 1



  • Disease resistance
  • Lipid transfer protein
  • Phytophthora nicotianae
  • Pseudomonas syringae pv. tabaci
  • Transgenic plant
  • Virus-induced gene silencing

ASJC Scopus subject areas

  • Plant Science
  • Agronomy and Crop Science

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