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Plastid gene expression (PGE) is one of the signals that regulate the expression of photosynthesis‐associated nuclear genes (PhANGs) via GENOMES UNCOUPLED1 (GUN1)‐dependent retrograde signaling. We recently isolated Arabidopsis sugar‐inducible cotyledon yellow‐192 (sicy‐192), a gain‐of‐function mutant of plastidic invertase, and showed that following the treatment of this mutant with sucrose, the...