Isolation and characterization of two genes encoding polygalacturonase-inhibiting protein from Populus deltoides

Qiang Cheng; Youzhi Cao; Huixin Pan; Mingxiu Wang; Minren Huang

doi:10.1016/S1673-8527(08)60084-3

Volume 35 Issue 10

Oct. 2008

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Article Navigation > Journal of Genetics and Genomics > 2008 > 35(10): 631-638

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Isolation and characterization of two genes encoding polygalacturonase-inhibiting protein from Populus deltoides

doi: 10.1016/S1673-8527(08)60084-3

Key Laboratory of Genetics & Biotechnology, Ministry of Education, Nanjing Forestry University, Nanjing 210037, China

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Corresponding author: E-mail address: mrhuang@njfu.edu.cn (Minren Huang)
Received Date: 2008-02-23
Accepted Date: 2008-07-18
Rev Recd Date: 2008-07-14

Available Online: 2008-10-18

Publish Date: 2008-10-20

Abstract

Abstract

Polygalacturonase-inhibiting proteins (PGIPs) are extracellular proteins that belong to the leucine-rich repeat (LRR) protein superfamily. PGIPs inhibit fungal polygalacturonases (PGs) and promote accumulation of oligogalacturonides, which activate plant defense responses. PGIPs play important roles in resistance to infection of pathogens. In this study, reverse transcriptase-polymerase chain reaction (RT-PCR) and RNA ligase-mediated rapid amplification of cDNA ends (RLM-RACE) were used to isolate the full-length PGIP cDNA from Populus deltoides (GenBank accession no. of PdPGIP2 and PdPGIP4: EF684913 and EF684912). Domain analysis revealed that the deduced amino acid sequences of PdPGIP2 and PdPGIP4 had a typical PGIP topology. Phylogenetic analysis of known PGIPs indicated that the two PdPGIPs were clustered to the defense-related PGIP clade. Using real-time RT-PCR, the expression patterns of the two PdPGIPs following treatment with a fungal pathogen and defense-related signaling molecules were studied. The expression levels ofPdPGIP2 and PdPGIP4 were both up-regulated when inoculated with the phytopathogenic fungus Marssonina brunnea. Therefore, it was proposed that the two PGIPs might be involved in the resistance to Marssonina brunnea in P. deltoides.
- Polygalacturonase-inhibiting protein,
- real-time RT-PCR

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References

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