Abstract
Chloroplast RNA splicing and ribosome maturation (CRM) domain proteins are a family of plant-specific proteins associated with RNA binding. In this study, we have conducted a detailed characterization of a novel rice CRM gene (LOC_Os04g39060) mutant, yl4, which showed yellow-green leaves at all the stages, had fewer tillers, and had a decreased plant height. Map-based cloning and CRISPR/Cas9 editing techniques all showed that YL4 encoded a CRM domain protein in rice. In addition, subcellular localization revealed that YL4 was in chloroplasts. YL4 transcripts were highly expressed in all leaves and undetectable in roots and stems, and the mutation of YL4 affected the transcription of chloroplast-development-related genes. This study indicated that YL4 is essential for chloroplast development and affects some agronomic traits.
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