Abstract
DNA methylation, which is one of the best understood epigenetic phenomena, plays an important role in plant responses to environmental stimuli. The rice introgression line IL177-103 and its recurrent parent IR64, which show contrasting salt stress tolerance, were used to characterize DNA methylation changes under salt stress and subsequent recovery using methylation-sensitive amplified polymorphism (MSAP) analysis. The introgression line IL177-103 showed significantly improved tolerance to salinity, as represented by higher relative water content, endogenous abscisic acid content, activity of reactive oxygen species scavenging enzymes, and lower Na(+) concentration in shoots, compared with IR64. The MSAP results showed that less than 10.5% of detected DNA methylation sites were genotype specific, in line with their similar genetic background. Salt-induced DNA methylation changes in both genotypes were mostly detected in roots, and the major portion of the salt-induced DNA demethylation/methylation alterations remained even after recovery, implying their inheritance in the present generation. Furthermore, a few sites with stable DNA methylation differences were identified between salt-tolerant IL177-103 and salt-sensitive IR64, ...Continue Reading
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