Journal
PLANT CELL REPORTS
Volume 28, Issue 3, Pages 419-427Publisher
SPRINGER
DOI: 10.1007/s00299-008-0653-3
Keywords
Lipid transfer protein; Transgenic plant; Virus-induced gene silencing; Disease resistance; Phytophthora nicotianae; Pseudomonas syringae pv. tabaci
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Funding
- Ministry of Agriculture and Forestry [CG3112]
- Crop Functional Genomics Center [R11-2003-008-04006, R11-2003-008-02006]
- Ministry of Science and Technology (MOST), Republic of Korea
- Agriculture & Forestry Technology Management Center, Republic of Korea [arpc301012-5] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0079422] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Rural Development Administration (RDA), Republic of Korea [07-2007-08-002-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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