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 o...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 of PdPGIP2 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.展开更多
The activity of polygalacturonase inhibiting protein (PGIP)was assayed in four kind of cultures induced endo-polygalacturonase (endo-PG). It was discovered that endo-PG stimulated obviously the accumulation of PGIP. T...The activity of polygalacturonase inhibiting protein (PGIP)was assayed in four kind of cultures induced endo-polygalacturonase (endo-PG). It was discovered that endo-PG stimulated obviously the accumulation of PGIP. The PGIP contents of SuMai No. 3 and SA-Ⅱ cells,which are fungal disease-resistant,are higher than the contents of Mian Yang No. 11 and JingHua No.1. It is indicated in cell level that PGIP has relation to resistance of plant.展开更多
多聚半乳糖醛酸酶抑制蛋白(PGIP)基因已成为植物抗真菌基因工程的研究热点之一,国内外已先后从25个属45种植物中克隆到了pgip基因或片段。截止于2008年3月1日,美国国立生物技术信息中心(The National Center for Biotechnology Informat...多聚半乳糖醛酸酶抑制蛋白(PGIP)基因已成为植物抗真菌基因工程的研究热点之一,国内外已先后从25个属45种植物中克隆到了pgip基因或片段。截止于2008年3月1日,美国国立生物技术信息中心(The National Center for Biotechnology Information,NCBI)GenBank中登记的pgip序列多达239条。本文从PGIPs的早期研究、自身特点以及表达调控方面综述了这种热点基因的研究进展,为更好的利用这一基因资源提供参考。展开更多
基金the National Basic Research Program of China (No 2007CB116307)Forestry Scientific and Technical Supporting Programs (No 2006BAD01A15-3)
文摘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 of PdPGIP2 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.
基金This research was supported by the Foundation of the National Plant Transgenic Program (No. J00-A-009) and the Natural Science Foundation of Guangdong Province (No. 990258).
文摘The activity of polygalacturonase inhibiting protein (PGIP)was assayed in four kind of cultures induced endo-polygalacturonase (endo-PG). It was discovered that endo-PG stimulated obviously the accumulation of PGIP. The PGIP contents of SuMai No. 3 and SA-Ⅱ cells,which are fungal disease-resistant,are higher than the contents of Mian Yang No. 11 and JingHua No.1. It is indicated in cell level that PGIP has relation to resistance of plant.
文摘多聚半乳糖醛酸酶抑制蛋白(PGIP)基因已成为植物抗真菌基因工程的研究热点之一,国内外已先后从25个属45种植物中克隆到了pgip基因或片段。截止于2008年3月1日,美国国立生物技术信息中心(The National Center for Biotechnology Information,NCBI)GenBank中登记的pgip序列多达239条。本文从PGIPs的早期研究、自身特点以及表达调控方面综述了这种热点基因的研究进展,为更好的利用这一基因资源提供参考。
