| Title: | Genome-wide analysis of cytosine DNA methylation revealed salicylic acid promotes defense pathways over seedling development in pearl millet |
| Author(s): | Ngom B; Sarr I; Kimatu J; Mamati E; Kane NA; |
| Address: | "a Department of Biotechnology and Molecular Biology, Pan African University Institute of basic Sciences , Technology and Innovation , Nairobi , Kenya. b CNRA and LNRPV, Institut Senegalais de Recherches Agricoles (ISRA) , Rte des hydrocarbures , Dakar , Senegal. c Department of Biology , South Eastern Kenya University, Directorate of Research, Innovation and Technology , Kitui , Kenya. d Department of Horticulture , Jomo Kenyatta University of Agriculture and Technology , Nairobi , Kenya" |
| DOI: | 10.1080/15592324.2017.1356967 |
| ISSN/ISBN: | 1559-2324 (Electronic) 1559-2316 (Print) 1559-2316 (Linking) |
| Abstract: | "Cytosine DNA methylation is an epigenetic regulatory system used by plants to control gene expression. Methylation pattern always changes after abiotic stresses, pathogens and pest infections or after a treatment with salicylic acid (SA). The latter is a key player in plant development and defense against insect herbivores, pathogens, and abiotic stresses. The roles of SA on the methylation patterns and the plant development were performed in 4 pearl millet (Pennisetum glaucum) varieties. Seedlings of 4 early-flowering photosensitive genotypes (PMS3, PMI8, PMG, and PMT2) were grown on MS medium supplemented with null or different doses of SA. Root growth was used as a parameter to evaluate the effects of SA at early stage development. DNA from these seedlings was extracted and Methylation-Sensitive Amplified Polymorphism (MSAP) was measured to assess the effects of SA on methylome. The methylation analysis revealed that SA treatment decreased the methylation, while inhibiting the root growth for all varieties tested, except in PMG at 0.5 mM, indicating a dose and a genotype response-dependence. The methylation level was positively correlated with the root growth. This suggests that SA influences both the methylome by demethylation activities and the root growth by interfering with the root development-responsive genes. The demethylation process, induced by the REPRESSOR OF SILCENCING 1 (ROS1) may activate R genes, or GH3.5 and downregulate the hormonal pathway under root development. These findings showed the pearl millet metabolism prioritized and promoted the defense pathways over vegetative development during stress" |
| Keywords: | "DNA Methylation/drug effects Gene Expression Regulation, Plant/drug effects Pennisetum/drug effects/*metabolism Plant Proteins/metabolism Plant Roots/drug effects/*metabolism Salicylic Acid/*pharmacology Seedlings/drug effects/*metabolism Cytosine DNA met;" |
| Notes: | "MedlineNgom, Baba Sarr, Ibrahima Kimatu, Josphert Mamati, Edward Kane, Ndjido Ardo eng 2017/08/02 Plant Signal Behav. 2017 Sep 2; 12(9):e1356967. doi: 10.1080/15592324.2017.1356967. Epub 2017 Jul 31" |
