title: DNA methylation changes detected by methylation-sensitive amplified polymorphism in two contrasting rice genotypes under salt stress.
abstract: DNA methylation, one of the most important epigenetic phenomena, plays a vital role in tuning gene expression during plant development as well as in response to environmental stimuli. In the present study, a methylation-sensitive amplified polymorphism (MSAP) analysis was performed to profile DNA methylation changes in two contrasting rice genotypes under salt stress. Consistent with visibly different phenotypes in response to salt stress, epigenetic markers classified as stable inter-cultivar DNA methylation differences were determined between salt-tolerant FL478 and salt-sensitive IR29. In addition, most tissue-specific DNA methylation loci were conserved, while many of the growth stage-dependent DNA methylation loci were dynamic between the two genotypes. Strikingly, salt stress induced a decrease in DNA methylation specifically in roots at the seedling stage that was more profound in IR29 than in the FL478. This result may indicate that demethylation of genes is an active epigenetic response to salt stress in roots at the seedling stage, and helps to further elucidate the implications of DNA methylation in crop growth and development.
authors.affiliation: Institute of Crop Sciences, National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
authors.forename: Wensheng
authors.initials: W
authors.lastname: Wang
authors.forename: Xiuqin
authors.initials: X
authors.lastname: Zhao
authors.forename: Yajiao
authors.initials: Y
authors.lastname: Pan
authors.forename: Linghua
authors.initials: L
authors.lastname: Zhu
authors.forename: Binying
authors.initials: B
authors.lastname: Fu
authors.forename: Zhikang
authors.initials: Z
authors.lastname: Li
mesh_terms: D054458:Amplified Fragment Length Polymorphism Analysis; D019175:DNA Methylation / Q000187:drug effects* / Q000235:genetics; D018745:Genome, Plant / Q000187:drug effects / Q000235:genetics; D005838:Genotype; D012275:Oryza / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development / Q000502:physiology; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D018517:Plant Roots / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D055049:Salt Tolerance / Q000235:genetics; D012492:Salts / Q000494:pharmacology*; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D013312:Stress, Physiological / Q000187:drug effects* / Q000235:genetics*; D013997:Time Factors
chemical_list: D012492:Salts