DNA methylation changes detected by methylation-sensitive amplified polymorphism in two contrasting rice genotypes under salt stress  

作　　者：Wensheng Wang Xiuqin Zhao Yajiao Pan Linghua Zhu Binying Fu Zhikang Li 

机构地区：[1]Institute of Crop Sciences, National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, Beijing 100081, China [2]International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines

出　　处：《Journal of Genetics and Genomics》2011年第9期419-424,共6页遗传学报（英文版）

基　　金：supported by the grants from the Central Public-interest Scientific Institution Basal Research Fund of China;The National High Technology Research and Development Program of China(863 Program,No. 2007AA10Z191)

摘　　要：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.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.

关 键 词：DNA methylation MSAP Salt tolerance Rice 

分 类 号：S828.2[农业科学—畜牧学] Q75[农业科学—畜牧兽医]