关键词: DNA甲基化抑制剂, 水稻, 生长发育, 耐盐性

Abstract: DNA methylation inhibitors can affect plant flowering, growth and stress responses by altering the genome DNA methylation level. In this study, salt-tolerant and salt-sensitive rice cultivars were treated with DNA methylation inhibitor at germination and seedling stages, respectively. And salt stress was applied to the treated seedlings. The results showed that the DNA methylation inhibitors treatment at germination stage resulted in a significant decrease in germination rate, and the seedlings, which showed short stature, clusters, death and other traits, and plant height, root length and dry weight were also significantly inhibited. Meanwhile, DNA methylation inhibitor could reduce the sodium ion concentration in the shoots under salt stress and increase the activity of ascorbate peroxidase (APX). Above results showed DNA methylation inhibitor affected rice growth and development and the salt tolerance in rice by changing the methylation level of genomic DNA to affect potassium and sodium ion concentrations and antioxidant enzyme activities.

Key words: DNA methylation inhibitors, rice, growth and development, salt tolerance