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Ribonucleic acid (RNA) is a central molecule that controls a broad range of plant processes through the transcriptional and posttranscriptional regulation of gene expression. In this special focus issue organized by Misato Ohtani, Yukio Kurihara, Motoaki Seki and Martin Crespi, we feature six invited reviews and seven research articles that provide an overview of the current achievements in RNA-mediated gene regulation studies, as well as discussions on the future directions of plant RNA biology research.
The cover images represent some of the physiological processes regulated by RNA-based gene regulation mechanisms that are described in this issue. Top left and middle, Arabidopsis thaliana leaves of a wild type (left) and urm11 urm12 mutant (middle). False-colored images of mesophyll cells and confocal optical sections of leaves are also shown (for details, see Nakai et al. 2019, pp. 2026–2039). Top right, a regenerated shoot from callus derived from a wild-type Arabidopsis thaliana hypocotyl explant (see Chiam et al. 2019, pp. 2000–2014). Bottom left and middle, wild-type Arabidopsis thaliana plants grown under nitrogen-sufficient (right) and nitrogen-deficient (middle) conditions (see Fukuda et al. 2019, pp. 1961–1973). Bottom right, roots of wild-type (left) and of the light-sensitive root-hair development 1 (lrh1) mutant (right) grown under light conditions, while treatment with premRNA splicing inhibitor mimics the lrh1 phenotype (middle) (see Ishizawa et al. 2019, pp. 1974–1985).
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