Role of the pepper cytochrome P450 gene CaCYP450A in defense responses against microbial pathogens

Plant cytochrome P450 enzymes are involved in a wide range of biosynthetic reactions, leading to various fatty acid conjugates, plant hormones, or defensive compounds. Herein, we have identified the pepper cytochrome P450 gene CaCYP450A, which is differentially induced during Xanthomonas campestris...

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Veröffentlicht in:Planta 2010-11, Vol.232 (6), p.1409-1421
Hauptverfasser: Hwang, In Sun, Hwang, Byung Kook
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description Plant cytochrome P450 enzymes are involved in a wide range of biosynthetic reactions, leading to various fatty acid conjugates, plant hormones, or defensive compounds. Herein, we have identified the pepper cytochrome P450 gene CaCYP450A, which is differentially induced during Xanthomonas campestris pv. vesicatoria (Xcv) infection. CaCYP450A contains a heme-binding motif, PXFXXGXRXCXG, located in the C-terminal region and a hydrophobic membrane anchor region at the N terminal. Knock-down of CaCYP450A by virus-induced gene silencing (VIGS) led to increased susceptibility to Xcv infection in pepper. CaCYP450A-overexpressing Arabidopsis plants exhibited lower pathogen growth and reduced disease symptoms, and they were more resistant to Pseudomonas syringae pv. tomato (Pst) and Hyaloperonospora arabidopsidis than wild-type plants. Overexpression of CaCYP450A also enhanced H₂O₂ accumulation and cell death. However, CaCYP450A Arabidopsis ortholog CYP94B3 mutants showed enhanced susceptibility to virulent Pst DC3000, but not to avirulent Pst DC3000 avrRpm1 or virulent H. arabidopsidis infection. Taken together, these results suggest that CaCYP450A is required for defense responses to microbial pathogens in plants. The nucleotide sequence data reported here has been deposited in the GenBank database under the accession number HM581974.
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Herein, we have identified the pepper cytochrome P450 gene CaCYP450A, which is differentially induced during Xanthomonas campestris pv. vesicatoria (Xcv) infection. CaCYP450A contains a heme-binding motif, PXFXXGXRXCXG, located in the C-terminal region and a hydrophobic membrane anchor region at the N terminal. Knock-down of CaCYP450A by virus-induced gene silencing (VIGS) led to increased susceptibility to Xcv infection in pepper. CaCYP450A-overexpressing Arabidopsis plants exhibited lower pathogen growth and reduced disease symptoms, and they were more resistant to Pseudomonas syringae pv. tomato (Pst) and Hyaloperonospora arabidopsidis than wild-type plants. Overexpression of CaCYP450A also enhanced H₂O₂ accumulation and cell death. However, CaCYP450A Arabidopsis ortholog CYP94B3 mutants showed enhanced susceptibility to virulent Pst DC3000, but not to avirulent Pst DC3000 avrRpm1 or virulent H. arabidopsidis infection. Taken together, these results suggest that CaCYP450A is required for defense responses to microbial pathogens in plants. The nucleotide sequence data reported here has been deposited in the GenBank database under the accession number HM581974.</abstract><cop>Berlin/Heidelberg</cop><pub>Berlin/Heidelberg : Springer-Verlag</pub><pmid>20830594</pmid><doi>10.1007/s00425-010-1266-y</doi><tpages>13</tpages></addata></record>
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subjects Agriculture
Amino Acid Sequence
Biological and medical sciences
Biomedical and Life Sciences
Capsicum - enzymology
Capsicum - genetics
Capsicum - microbiology
Capsicum annuum
cell death
Cytochrome
cytochrome P-450
Cytochrome P-450 Enzyme System - chemistry
Cytochrome P-450 Enzyme System - genetics
Cytochromes
Defense responses
Ecology
Forestry
Fundamental and applied biological sciences. Psychology
Gene Knockdown Techniques
Genes, Plant
Hormones
Infections
Inoculation
Leaves
Life Sciences
Molecular Sequence Data
Original Article
Pathogens
Peppers
Plant growth
Plant Sciences
Plants
Plants, Genetically Modified
Reverse Transcriptase Polymerase Chain Reaction
Sequence Homology, Amino Acid
Tomatoes
Transgenic Arabidopsis
Transgenic plants
VIGS assay
Xanthomonas campestris
Xanthomonas campestris - pathogenicity
title Role of the pepper cytochrome P450 gene CaCYP450A in defense responses against microbial pathogens
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