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The tomato UV-damaged DNA-binding protein-1 (DDB1) is implicated in pathogenesis-related (PR) gene expression and resistance to Agrobacterium tumefaciens.
MedLine Citation:
PMID:  21726402     Owner:  NLM     Status:  Publisher    
Plants defend themselves against potential pathogens via the recognition of pathogen-associated molecular patterns (PAMPs). However, the molecular mechanisms underlying this PAMP-triggered immunity (PTI) are largely unknown. In this study, we show that tomato HP1/DDB1, coding for a key component of the CUL4-based ubiquitin E3 ligase complex, is required for resistance to Agrobacterium tumefaciens. We found that the DDB1-deficient mutant (high pigment-1, hp1) is susceptible to nontumorigenic A. tumefaciens. The efficiency of callus generation from the hp1 cotyledons was extremely low as a result of the necrosis caused by Agrobacterium infection. On infiltration of nontumorigenic A. tumefaciens into leaves, the hp1 mutant moderately supported Agrobacterium growth and developed disease symptoms, but the expression of the pathogenesis-related gene SlPR1a1 and several PTI marker genes was compromised at different levels. Moreover, exogenous application of salicylic acid (SA) triggered SlPR1a1 gene expression and enhanced resistance to A. tumefaciens in wild-type tomato plants, whereas these SA-regulated defence responses were abolished in hp1 mutant plants. Thus, HP1/DDB1 may function through interaction with the SA-regulated PTI pathway in resistance against Agrobacterium infection.
Jikai Liu; Hanjing Li; Min Miao; Xiaofeng Tang; Jim Giovannoni; Fangming Xiao; Yongsheng Liu
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-4
Journal Detail:
Title:  Molecular plant pathology     Volume:  -     ISSN:  1364-3703     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954969     Medline TA:  Mol Plant Pathol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610064, China Department of Plant, Soil, and Entomological Sciences, University of Idaho Moscow, ID 83844-2339, USA School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, China US Department of Agriculture-Agricultural Research Service, Robert Holly Center and Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, NY 14853, USA.
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