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TGACG-BINDING FACTOR 1 (TGA1) and TGA4 regulate salicylic acid and pipecolic acid biosynthesis by modulating the expression of SYSTEMIC ACQUIRED RESISTANCE DEFICIENT 1 (SARD1) and CALMODULIN-BINDING PROTEIN 60g (CBP60g)
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TGACG-BINDING FACTOR 1 (TGA1) and TGA4 regulate salicylic acid and pipecolic acid biosynthesis by modulating the expression of SYSTEMIC ACQUIRED RESISTANCE DEFICIENT 1 (SARD1) and CALMODULIN-BINDING PROTEIN 60g (CBP60g)
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TGACG-BINDING FACTOR 1 (TGA1) and TGA4 regulate salicylic acid and pipecolic acid biosynthesis by modulating the expression of SYSTEMIC ACQUIRED RESISTANCE DEFICIENT 1 (SARD1) and CALMODULIN-BINDING PROTEIN 60g (CBP60g)
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Journal Article
TGACG-BINDING FACTOR 1 (TGA1) and TGA4 regulate salicylic acid and pipecolic acid biosynthesis by modulating the expression of SYSTEMIC ACQUIRED RESISTANCE DEFICIENT 1 (SARD1) and CALMODULIN-BINDING PROTEIN 60g (CBP60g)
2018
Overview
Salicylic acid (SA) and pipecolic acid (Pip) play important roles in plant immunity. Here we analyzed the roles of transcription factors TGACG-BINDING FACTOR 1 (TGA1) and TGA4 in regulating SA and Pip biosynthesis in Arabidopsis thaliana.
We quantified the expression levels of SYSTEMIC ACQUIRED RESISTANCE DEFICIENT 1 (SARD1) and CALMODULIN-BINDING PROTEIN 60g (CBP60g), which encode two master transcription factors of plant immunity, and the accumulation of SA and Pip in tga1-1 tga4-1 mutant plants. We tested whether SARD1 and CBP60g are direct targets of TGA1 by chromatin immunoprecipitation–polymerase chain reaction (ChIP-PCR).
In addition to promoting pathogen-induced SA biosynthesis, we found that SARD1 and CBP60g also positively regulated Pip biosynthesis by targeting genes encoding key biosynthesis enzymes of Pip. TGA1/TGA4 were required for full induction of SARD1 and CBP60g in plant defense. ChIP-PCR analysis showed that SARD1 was a direct target of TGA1. In tga1-1 tga4-1 mutant plants, the expression levels of SARD1 and CBP60g along with SA and Pip accumulation following pathogen infection were dramatically reduced compared with those in wild-type plants. Consistent with reduced expression of SARD1 and CBP60g, pathogen-associated molecular pattern (PAMP)-induced pathogen resistance and systemic acquired resistance were compromised in tga1-1 tga4-1.
Our study showed that TGA1 and TGA4 regulate Pip and SA biosynthesis by modulating the expression of SARD1 and CBP60g.
Publisher
New Phytologist Trust,Wiley Subscription Services, Inc
Subject
/ Acids
/ Arabidopsis Proteins - genetics
/ Arabidopsis Proteins - metabolism
/ Basic-Leucine Zipper Transcription Factors - genetics
/ Basic-Leucine Zipper Transcription Factors - metabolism
/ Calmodulin-Binding Proteins - genetics
/ Calmodulin-Binding Proteins - metabolism
/ CALMODULIN‐BINDING PROTEIN 60g (CBP60g)
/ DNA
/ enzymes
/ Genes
/ Immunity
/ mutants
/ Mutation
/ pathogen-associated molecular patterns
/ PCR
/ Pipecolic Acids - metabolism
/ Proteins
/ systemic acquired resistance
/ SYSTEMIC ACQUIRED RESISTANCE DEFICIENT 1 (SARD1)
/ TGACG‐BINDING FACTOR 1 (TGA1)
