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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...
Chloroplast development in plants is regulated by a series of coordinated biological processes. In this work, a genetic suppressor screen for the leaf variegation phenotype of the thylakoid formation 1 (thf1) mutant combined with a proteomic assay was employed to elucidate this complicated network. We identified a mutation in ClpR4, named clpR4‐3, which leads to leaf virescence and also rescues the...
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