ArticlePlant communications2024
The chloroplast pentatricopeptide repeat protein RCN22 regulates tiller number in rice by affecting sugar levels via the TB1-RCN22-RbcL module.
Article in Plant communications, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Systematic analysis of the ShRZFP gene family and its association with tiller regulation in sugarcane.BMC plant biology · 2026Article
- Genome-Wide Association Study Reveals the Genetic Architecture and Key Drought and Yield Related Genes in Common Vetch (Vicia sativa L.).Plant biotechnology journal · 2026Article
- Pyroxsulam Boosts Wheat Tolerance to Bixlozone: Effects and Mechanisms.Plants (Basel, Switzerland) · 2026Article
- Genetic engineering of RuBisCO by multiplex CRISPR editing small subunits in rice.Plant biotechnology journal · 2025Article
- Unleashing the Potential of CRISPR/Cas9 Genome Editing for Yield-Related Traits in Rice.Plants (Basel, Switzerland) · 2024Review
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Authors and funding
10 authors.
Funding
Abstract
As an important yield component, rice tiller number controls panicle number and determines grain yield. Regulation of rice tiller number by chloroplast pentatricopeptide repeat (PPR) proteins has not been reported previously. Here, we report the rice reduced culm number22 (rcn22) mutant, which produces few tillers owing to suppressed tiller bud elongation. Map-based cloning revealed that RCN22 encodes a chloroplast-localized P-type PPR protein. We found that RCN22 specifically binds to the 5' UTR of RbcL mRNA (encoding the large subunit of Rubisco) and enhances its stability. The reduced abundance of RbcL mRNA in rcn22 leads to a lower photosynthetic rate and decreased sugar levels. Consequently, transcript levels of DWARF3 (D3) and TEOSINTE BRANCHED1 (TB1) (which encode negative regulators of tiller bud elongation) are increased, whereas protein levels of the positive regulator DWARF53 (D53) are decreased. Furthermore, high concentrations of sucrose can rescue the tiller bud growth defect of the rcn22 mutant. On the other hand, TB1 directly binds to the RCN22 promoter and downregulates its expression. The tb1/rcn22 double mutant shows a tillering phenotype similar to that of rcn22. Our results suggest that the TB1-RCN22-RbcL module plays a vital role in rice tiller bud elongation by affecting sugar levels.
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