overexpression of the pine transcription factor PpDof5 in Arabidopsis leads to increased lignin content and affects carbon and nitrogen metabolism
PpDof 5 is a regulator of the expression of glutamine synthetase (GS; EC 6.3.1.2) genes in photosynthetic and non‐photosynthetic tissues of maritime pine. We have used Arabidopsis thaliana as a model system to study PpDof 5 function in planta, generating transgenic lines overexpressing the pine tran...
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Published in | Physiologia plantarum Vol. 155; no. 4; pp. 369 - 383 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford, UK
Blackwell Publishing Ltd
01.12.2015
Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | PpDof 5 is a regulator of the expression of glutamine synthetase (GS; EC 6.3.1.2) genes in photosynthetic and non‐photosynthetic tissues of maritime pine. We have used Arabidopsis thaliana as a model system to study PpDof 5 function in planta, generating transgenic lines overexpressing the pine transcription factor. The overexpression of PpDof 5 resulted in a substantial increase of lignin content with a simultaneous regulation of carbon and nitrogen key genes. In addition, partitioning in carbon and nitrogen compounds was spread via various secondary metabolic pathways. These results suggest pleiotropic effects of PpDof 5 expression on various metabolic pathways of carbon and nitrogen metabolism. Plants overexpressing PpDof 5 exhibited upregulation of genes encoding enzymes for sucrose and starch biosynthesis, with a parallel increase in the content of soluble sugars. When the plants were grown under nitrate as the sole nitrogen source, they exhibited a significant regulation of the expression of genes involved mainly in signaling, but similar growth rates to wild‐type plants. However, plants grown under ammonium exhibited major induction of the expression of photosynthetic genes and differential expression of ammonium and nitrate transporters. All these data suggest that in addition to controlling ammonium assimilation, PpDof 5 could be also involved in the regulation of other pathways in carbon and nitrogen metabolism in pine trees. |
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Bibliography: | http://dx.doi.org/10.1111/ppl.12381 Fig. S1. Determination of the copy number in the transgenic lines using quantitative PCR. The Arabidopsis single-copy gene 4HPPD was used as standard as described in Kihara et al. () the ratio of amplicons derived from the integrated gene and the internal control is indicated at the bottom of each line.Table S1. Specific primers used for microarray validation.Table S2. Annotation of genes changing significantly in the microarray of plants treated with nitrate.Table S3. GO term of genes changing significantly in the microarray of plants treated with nitrate.Table S4. Annotation of genes changing significantly in the microarray of plants treated with ammonium.Table S5. GO term of genes changing significantly in the microarray of plants treated with ammonium. Junta de Andalucia - No. BIO-474 istex:F90DE1AAE86C604ECFC7FC0E830C948367486EEF ArticleID:PPL12381 ark:/67375/WNG-L0DDTW38-B Spanish Ministry of Economy and Competitiveness - No. BIO2012-33797 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0031-9317 1399-3054 |
DOI: | 10.1111/ppl.12381 |