title: Alterations in DNA methylation and genome structure in two rice mutant lines induced by high pressure.
abstract: By using high-pressure treatment, two mutant lines were obtained from a genetically stable japonica rice cultivar Bijing38. Genomic DNA of the mutant lines, together with the original line (Bijing38), was either undigested or digested by Hpa IIMsp I, and then subjected to molecular analysis using two markers, ISSR and RAPD. Results indicated that changes in the PCR amplification profiles of both markers are apparent in the two mutant lines compared with the original rice cultivar, suggesting that there had been both sequence changes and DNA methylation modifications in the mutant lines. Southern blot analysis using diverse sequences, including two cellular genes (S2 and S3), a set of retrotransposons (Osr7, Osr36, Tos19 and more), and a MITE transposon family (mPing and Pong), confirmed the results, and indicated that changes in DNA methylation pattern, genomic structure, and possible activation of some transposons indeed occurred in the mutant lines. Moreover, these changes are stably maintained through selfed generations and in different organs. Thus, our results indicate that it is possible to obtain stable mutants in rice by high pressure treatments, and the molecular basis of the mutants may include both genetic and epigenetic changes. Therefore, high hydrostatic pressure seems a promising approach for plant mutagenesis.
authors.affiliation: National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors.forename: Sile
authors.initials: S
authors.lastname: Shen
authors.forename: Zhenwei
authors.initials: Z
authors.lastname: Wang
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Shan
authors.forename: Hua
authors.initials: H
authors.lastname: Wang
authors.forename: Ling
authors.initials: L
authors.lastname: Li
authors.forename: Xuyun
authors.initials: X
authors.lastname: Lin
authors.forename: Likun
authors.initials: L
authors.lastname: Long
authors.forename: Kenan
authors.initials: K
authors.lastname: Weng
authors.forename: Bao
authors.initials: B
authors.lastname: Liu
authors.forename: Guangtian
authors.initials: G
authors.lastname: Zou
mesh_terms: D015139:Blotting, Southern; D019175:DNA Methylation; D004251:DNA Transposable Elements / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics / Q000378:metabolism; D019003:Deoxyribonuclease HpaII / Q000378:metabolism; D017343:Genes, Plant / Q000235:genetics; D005819:Genetic Markers / Q000235:genetics; D018745:Genome, Plant / Q000235:genetics*; D009154:Mutation; D012275:Oryza / Q000235:genetics* / Q000254:growth & development; D011312:Pressure; D019105:Random Amplified Polymorphic DNA Technique; D018626:Retroelements / Q000235:genetics
chemical_list: D004251:DNA Transposable Elements; D018744:DNA, Plant; D005819:Genetic Markers; D018626:Retroelements; D019003:Deoxyribonuclease HpaII