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Ectopic Expression of a Proteinase Inhibitor I4 (MtPiI4) Gene from Medicago truncatula Confers Plant Resistance to Pseudomonas syringae pv. Tomato DC3000

Proteinase inhibitors (PIs) play an important role in plant responses to biotic and environmental stimuli, but little is known about the role of PIs in mediating plant immune responses to microbial infection. In this study, a gene named proteinase inhibitor I4 (MtPiI4) was isolated from Medicago tru...

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Published in:Plant molecular biology reporter 2015-12, Vol.33 (6), p.1686-1696
Main Authors: Sun, Di, Chen, Jian, Zhou, Zhao Sheng, Zhu, Can Can, Hu, Liang Bin, Wang, Lei, Yang, Lu, Yang, Zhi Min
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description Proteinase inhibitors (PIs) play an important role in plant responses to biotic and environmental stimuli, but little is known about the role of PIs in mediating plant immune responses to microbial infection. In this study, a gene named proteinase inhibitor I4 (MtPiI4) was isolated from Medicago truncatula and characterized as a serpin family gene with a typically conserved DUF716 domain. MtPiI4 was differentially expressed in seed, root, leaf, stem and flower tissues. Expression of MtPiI4 was induced by inoculation with a typical bacterial pathogen Pseudomonas syringae pv. tomato DC3000 strain (Pst DC3000). It was also up-regulated by methyl jasmonate (MeJA) treatment. To identify its function in regulating plant immunity against Pst DC3000, we constructed transgenic Arabidopsis plants over-expressing MtPiI4. Compared to wild type, 35S::MtPiI4 plants showed enhanced resistance to Pst DC3000. Expression of JA biosynthetic and responsive genes such as LOX2, PDF1.2, and VSP1 was depressed in 35S::MtPiI4 plants as compared to wild type, suggesting that the JA signaling response was attenuated in 35S::MtPiI4 plants upon Pst DC3000 exposure. Furthermore, over-expression of MtPiI4 led to up-regulation of NPR1 (nonexpressor of pathogenesis-related gene 1—a negative regulator of JA signaling) and down-regulation of MAPK4 (mitogen-activated protein kinase4—a positive regulator of JA signaling). These results indicate that MtPiI4 regulation of plant resistance to Pst DC3000 is involved in the JA signaling transduction pathway.
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It was also up-regulated by methyl jasmonate (MeJA) treatment. To identify its function in regulating plant immunity against Pst DC3000, we constructed transgenic Arabidopsis plants over-expressing MtPiI4. Compared to wild type, 35S::MtPiI4 plants showed enhanced resistance to Pst DC3000. Expression of JA biosynthetic and responsive genes such as LOX2, PDF1.2, and VSP1 was depressed in 35S::MtPiI4 plants as compared to wild type, suggesting that the JA signaling response was attenuated in 35S::MtPiI4 plants upon Pst DC3000 exposure. Furthermore, over-expression of MtPiI4 led to up-regulation of NPR1 (nonexpressor of pathogenesis-related gene 1—a negative regulator of JA signaling) and down-regulation of MAPK4 (mitogen-activated protein kinase4—a positive regulator of JA signaling). 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Tomato DC3000</atitle><jtitle>Plant molecular biology reporter</jtitle><stitle>Plant Mol Biol Rep</stitle><date>2015-12-01</date><risdate>2015</risdate><volume>33</volume><issue>6</issue><spage>1686</spage><epage>1696</epage><pages>1686-1696</pages><issn>0735-9640</issn><eissn>1572-9818</eissn><abstract>Proteinase inhibitors (PIs) play an important role in plant responses to biotic and environmental stimuli, but little is known about the role of PIs in mediating plant immune responses to microbial infection. In this study, a gene named proteinase inhibitor I4 (MtPiI4) was isolated from Medicago truncatula and characterized as a serpin family gene with a typically conserved DUF716 domain. MtPiI4 was differentially expressed in seed, root, leaf, stem and flower tissues. Expression of MtPiI4 was induced by inoculation with a typical bacterial pathogen Pseudomonas syringae pv. tomato DC3000 strain (Pst DC3000). It was also up-regulated by methyl jasmonate (MeJA) treatment. To identify its function in regulating plant immunity against Pst DC3000, we constructed transgenic Arabidopsis plants over-expressing MtPiI4. Compared to wild type, 35S::MtPiI4 plants showed enhanced resistance to Pst DC3000. Expression of JA biosynthetic and responsive genes such as LOX2, PDF1.2, and VSP1 was depressed in 35S::MtPiI4 plants as compared to wild type, suggesting that the JA signaling response was attenuated in 35S::MtPiI4 plants upon Pst DC3000 exposure. Furthermore, over-expression of MtPiI4 led to up-regulation of NPR1 (nonexpressor of pathogenesis-related gene 1—a negative regulator of JA signaling) and down-regulation of MAPK4 (mitogen-activated protein kinase4—a positive regulator of JA signaling). These results indicate that MtPiI4 regulation of plant resistance to Pst DC3000 is involved in the JA signaling transduction pathway.</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s11105-015-0865-y</doi><tpages>11</tpages></addata></record>
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source Springer Nature
subjects Alfalfa
Arabidopsis
Bioinformatics
Biomedical and Life Sciences
flowers
gene expression regulation
gene overexpression
genes
immune response
leaves
Life Sciences
Lycopersicon esculentum
Medicago truncatula
Metabolomics
methyl jasmonate
Original Paper
pathogens
Plant biology
Plant Breeding/Biotechnology
Plant resistance
plant response
Plant Sciences
Proteinase inhibitors
Proteomics
Pseudomonas syringae
Pseudomonas syringae pv. tomato
tissues
Tomatoes
transgenic plants
title Ectopic Expression of a Proteinase Inhibitor I4 (MtPiI4) Gene from Medicago truncatula Confers Plant Resistance to Pseudomonas syringae pv. Tomato DC3000
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