ArticlePlant biotechnology journal2018
OsPK2 encodes a plastidic pyruvate kinase involved in rice endosperm starch synthesis, compound granule formation and grain filling.
Article in Plant biotechnology journal, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 53 papers, 2 of them syntheses that pooled it.
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53 citing papers in PubMed, 2 syntheses or guidelines pooled it, 105 citations in OpenAlex.
- Meta-QTLs, ortho-meta-QTLs and candidate genes for grain yield and associated traits in wheat (Triticum aestivum L.).TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2022Pooled it
- A Systematic View Exploring the Role of Chloroplasts in Plant Abiotic Stress Responses.BioMed research international · 2019Pooled it
- Common genetic control for grain filling duration and kernel weight in grain sorghum.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2026Article
- Nitrogen-modified atmosphere with re-aeration storage triggers deterioration in paddy rice by disrupting central carbon metabolism.Food chemistry: X · 2026Article
- Research Advances in Plant Pyruvate Kinase.International journal of molecular sciences · 2026Review
- The OsMADS18-OsbZIP60 module plays a critical role in influencing grain chalkiness in rice.Science China. Life sciences · 2026Article
- Integrated transcriptomic and metabolomic analysis reveals drivers of protein and oil variation in cottonseed.Food chemistry. Molecular sciences · 2025Article
- Reciprocal control of metabolic and chromatin regulators improves rice tolerance to heat.Nature communications · 2025Article
- A glutamyl-tRNA reductase and its binding protein promote transitory starch biosynthesis and enhance grain quality and yield in rice.Plant communications · 2025Article
- Phenotypic characterization and genetic factor identification of starch content-related traits in foxtail millet (Setaria italica L.).TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025Article
- Antagonistic Ghd7-OsNAC42 Complexes Modulate Carbon and Nitrogen Metabolism to Achieves Superior Quality and High Yield in Rice.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025Article
- The F-box protein CHALK10 mediates SEMIDWARF-1 ubiquitination and degradation to negatively regulate grain chalkiness in rice.Plant communications · 2025Article
- QTN detection and candidate gene identification for improved eating and cooking quality in rice using GWAS and PLS regression analysis.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025Article
- Phosphoenolpyruvate and Related Metabolic Pathways Contribute to the Regulation of Plant Growth and Development.International journal of molecular sciences · 2025Review
- Compared analysis of physiology and transcriptomics reveals superior cold tolerance in CV-1 compared to K326.Frontiers in plant science · 2025Article
- The LCG1-OsBP5/OsEBP89-Wx module regulates the grain chalkiness and taste quality in rice.Plant biotechnology journal · 2025Article
- Phenotypic Analysis and Gene Cloning of Rice Floury Endosperm MutantPlants (Basel, Switzerland) · 2024Article
- Source-sink synergy is the key unlocking sweet potato starch yield potential.Nature communications · 2024Article
- Profiling and Improvement of Grain Quality Traits for Consumer Preferable Basmati Rice in the United States.Plants (Basel, Switzerland) · 2024Review
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Authors and funding
12 authors at 2 institutions in 1 country.
Funding
Abstract
Starch is the main form of energy storage in higher plants. Although several enzymes and regulators of starch biosynthesis have been defined, the complete molecular machinery remains largely unknown. Screening for irregularities in endosperm formation in rice represents valuable prospect for studying starch synthesis pathway. Here, we identified a novel rice white-core endosperm and defective grain filling mutant, ospk2, which displays significantly lower grain weight, decreased starch content and alteration of starch physicochemical properties when compared to wild-type grains. The normal starch compound granules were drastically reduced and more single granules filled the endosperm cells of ospk2. Meanwhile, the germination rate of ospk2 seeds after 1-year storage was observably reduced compared with wild-type. Map-based cloning of OsPK2 indicated that it encodes a pyruvate kinase (PK, ATP: pyruvate 2-O-phosphotransferase, EC 2.7.1.40), which catalyses an irreversible step of glycolysis. OsPK2 has a constitutive expression in rice and its protein localizes in chloroplasts. Enzyme assay showed that the protein product from expressed OsPK2 and the crude protein extracted from tissues of wild-type exhibits strong PK activity; however, the mutant presented reduced protein activity. OsPK2 (PKpα1) and three other putative rice plastidic isozymes, PKpα2, PKpβ1 and PKpβ2, can interact to form heteromer. Moreover, the mutation leads to multiple metabolic disorders. Altogether, these results denote new insights into the role of OsPK2 in plant seed development, especially in starch synthesis, compound granules formation and grain filling, which would be useful for genetic improvement of high yield and rice grain quality.
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