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Ribosomal RNA processing is essential for plastid ribosome biogenesis, but is still poorly understood in higher plants. Here, we show that SUPPRESSOR OF THYLAKOID FORMATION1 (SOT1), a plastid‐localized pentatricopeptide repeat (PPR) protein with a small MutS‐related domain, is required for maturation of the 23S–4.5S rRNA dicistron. Loss of SOT1 function leads to slower chloroplast development, suppression...
Leaf variegation resulting from nuclear gene mutations has been used as a model system to elucidate the molecular mechanisms of chloroplast development. Since most variegation genes also function in photosynthesis, it remains unknown whether their roles in photosynthesis and chloroplast development are distinct. Here, using the variegation mutant thylakoid formation1 (thf1) we show that variegation...
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