Overexpression of lipid transfer protein (LTP) genes enhances resistance to plant pathogens and LTP functions in long-distance systemic signaling in tobacco.
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.
Sarowar
Sujon
S
School of Life Sciences and Biotechnology, Korea University, Seoul, South Korea.
Kim
Young Jin
YJ
Kim
Ki Deok
KD
Hwang
Byung Kook
BK
Ok
Sung Han
SH
Shin
Jeong Sheop
JS
D002212:Capsicum / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D020868:Gene Silencing; D007113:Immunity, Innate; D010838:Phytophthora / Q000472:pathogenicity; D010935:Plant Diseases / Q000235:genetics*; D010940:Plant Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D044224:Pseudomonas syringae / Q000472:pathogenicity; D015398:Signal Transduction; D014026:Nicotiana / Q000235:genetics* / Q000276:immunology / Q000378:metabolism
D002352:Carrier Proteins; D010940:Plant Proteins; C030363:lipid transfer protein