CsBZIP40, a BZIP transcription factor in sweet orange, plays a positive regulatory role in citrus bacterial canker response and tolerance

Citrus bacterial canker (CBC) caused by Xanthomonas citri subsp. citri (Xcc) is a systemic bacterial disease that affects citrus plantations globally. Biotic stress in plants has been linked to a group of important transcription factors known as Basic Leucine Zippers (BZIPs). In this study, CsBZIP40...

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Veröffentlicht in:PloS one 2019-10, Vol.14 (10), p.e0223498-e0223498
Hauptverfasser: Li, Qiang, Jia, Ruirui, Dou, Wanfu, Qi, Jingjing, Qin, Xiujuan, Fu, Yongyao, He, Yongrui, Chen, Shanchun
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Jia, Ruirui
Dou, Wanfu
Qi, Jingjing
Qin, Xiujuan
Fu, Yongyao
He, Yongrui
Chen, Shanchun
description Citrus bacterial canker (CBC) caused by Xanthomonas citri subsp. citri (Xcc) is a systemic bacterial disease that affects citrus plantations globally. Biotic stress in plants has been linked to a group of important transcription factors known as Basic Leucine Zippers (BZIPs). In this study, CsBZIP40 was functionally characterized by expression analysis, including induction by Xcc and hormones, subcellular localization, over-expression and RNAi silencing. CsBZIP40 belongs to group D of the CsBZIP family of transcription factors and localizes in the nucleus, potentially serving as a transcriptional regulator. In wild type (WT) plants CsBZIP40 can be induced by plant hormones in addition to infection by Xcc which has given insight into its involvement in CBC. In the present study, over-expression of CsBZIP40 conferred resistance to Xcc while its silencing led to Xcc susceptibility. Both over-expression and RNAi affected salicylic acid (SA) production and expression of the genes involved in the SA synthesis and signaling pathway, in addition to interaction of CsBZIP40 with CsNPR1, as detected by a GST pull-down assay. Taken together, the results of this study confirmed the important role of CsBZIP40 in improving resistance to citrus canker through the SA signaling pathway by the presence of NPR1 to activate PR genes. Our findings are of potential value in the breeding of tolerance to CBC in citrus fruits.
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Biotic stress in plants has been linked to a group of important transcription factors known as Basic Leucine Zippers (BZIPs). In this study, CsBZIP40 was functionally characterized by expression analysis, including induction by Xcc and hormones, subcellular localization, over-expression and RNAi silencing. CsBZIP40 belongs to group D of the CsBZIP family of transcription factors and localizes in the nucleus, potentially serving as a transcriptional regulator. In wild type (WT) plants CsBZIP40 can be induced by plant hormones in addition to infection by Xcc which has given insight into its involvement in CBC. In the present study, over-expression of CsBZIP40 conferred resistance to Xcc while its silencing led to Xcc susceptibility. Both over-expression and RNAi affected salicylic acid (SA) production and expression of the genes involved in the SA synthesis and signaling pathway, in addition to interaction of CsBZIP40 with CsNPR1, as detected by a GST pull-down assay. 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Biotic stress in plants has been linked to a group of important transcription factors known as Basic Leucine Zippers (BZIPs). In this study, CsBZIP40 was functionally characterized by expression analysis, including induction by Xcc and hormones, subcellular localization, over-expression and RNAi silencing. CsBZIP40 belongs to group D of the CsBZIP family of transcription factors and localizes in the nucleus, potentially serving as a transcriptional regulator. In wild type (WT) plants CsBZIP40 can be induced by plant hormones in addition to infection by Xcc which has given insight into its involvement in CBC. In the present study, over-expression of CsBZIP40 conferred resistance to Xcc while its silencing led to Xcc susceptibility. Both over-expression and RNAi affected salicylic acid (SA) production and expression of the genes involved in the SA synthesis and signaling pathway, in addition to interaction of CsBZIP40 with CsNPR1, as detected by a GST pull-down assay. Taken together, the results of this study confirmed the important role of CsBZIP40 in improving resistance to citrus canker through the SA signaling pathway by the presence of NPR1 to activate PR genes. Our findings are of potential value in the breeding of tolerance to CBC in citrus fruits.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>31584990</pmid><doi>10.1371/journal.pone.0223498</doi><tpages>e0223498</tpages><orcidid>https://orcid.org/0000-0001-7460-4841</orcidid><oa>free_for_read</oa></addata></record>
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subjects Adaptation, Biological
Antibiotics
Bacteria
Bacterial diseases
Bacterial infections
Basic-Leucine Zipper Transcription Factors - genetics
Basic-Leucine Zipper Transcription Factors - metabolism
Biology and Life Sciences
Breeding
Canker
Citrus - genetics
Citrus - microbiology
Citrus canker
Citrus fruits
Citrus sinensis - genetics
Corn
DNA binding proteins
Engineering and Technology
Fruit trade
Fruits
Gene expression
Gene Expression Regulation, Plant
Genes
Genetically altered foods
Hormones
Host-Pathogen Interactions
Infections
Kinases
Leucine
Localization
Menopause
Models, Molecular
Overexpression
Phenols (Class of compounds)
Phenotype
Physiology
Plant diseases
Plant Diseases - genetics
Plant Diseases - microbiology
Plant Growth Regulators - metabolism
Plant hormones
Plantations
Plants (botany)
Protein Transport
Research and Analysis Methods
RNA interference
RNA-mediated interference
Salicylic acid
Signal transduction
Signaling
Transcription factors
Trends
title CsBZIP40, a BZIP transcription factor in sweet orange, plays a positive regulatory role in citrus bacterial canker response and tolerance
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