ArticlePlant molecular biology2007
Identification of the ADP-glucose pyrophosphorylase isoforms essential for starch synthesis in the leaf and seed endosperm of rice (Oryza sativa L.).
Article in Plant molecular biology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 90 papers.
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90 citing papers in PubMed, 220 citations in OpenAlex.
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- Mutation of OsKIF14.3, a Kinesin-14 Subfamily Protein, Altered Starch Metabolism and Caused Yellowish Leaf in Rice.International journal of molecular sciences · 2025Article
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- Carbohydrate flow during grain filling: Phytohormonal regulation and genetic control in rice (Oryza sativa).Journal of integrative plant biology · 2025Review
- Unveiling distinct storage composition and starch properties in developing indica rice grains via transcriptional profiling and enzymatic activity analysis.Computational and structural biotechnology journal · 2025Article
- An Integrative Analysis of the Transcriptome and Proteome of Rice Grain Chalkiness Formation Under High Temperature.Plants (Basel, Switzerland) · 2024Article
- ADP-glucose pyrophosphorylase gene family in soybean and implications in drought stress tolerance.Genes & genomics · 2024Article
- OsIPK1 frameshift mutations disturb phosphorus homeostasis and impair starch synthesis during grain filling in rice.Plant molecular biology · 2024Article
- Comparative Proteomic Analysis Provides New Insights into Improved Grain-filling in Ratoon Season Rice.Rice (New York, N.Y.) · 2024Article
- Exploring the phosphorus-starch content balance mechanisms in maize grains using GWAS population and transcriptome data.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2024Article
- Dynamics of starch formation and gene expression during grain filling and its possible influence on grain quality.Scientific reports · 2024Article
- Chalkiness and premature controlled by energy homeostasis in OsNAC02 Ko-mutant during vegetative endosperm development.BMC plant biology · 2024Article
- Transcriptomic and metabolomic analyses reveal the mechanism of color difference between two kinds ofFrontiers in plant science · 2024Article
30 more citing papers are in PubMed but not listed here.
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Authors and funding
13 authors at 5 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
ADP-glucose pyrophosphorylase (AGP) catalyzes the first committed step of starch biosynthesis in higher plants. To identify AGP isoforms essential for this biosynthetic process in sink and source tissues of rice plants, we analyzed the rice AGP gene family which consists of two genes, OsAGPS1 and OsAGPS2, encoding small subunits (SSU) and four genes, OsAGPL1, OsAGPL2, OsAGPL3 and OsAGPL4, encoding large subunits (LSU) of this enzyme heterotetrameric complex. Subcellular localization studies using green fluorescent protein (GFP) fusion constructs indicate that OsAGPS2a, the product of the leaf-preferential transcript of OsAGPS2, and OsAGPS1, OsAGPL1, OsAGPL3, and OsAGPL4 are plastid-targeted isoforms. In contrast, two isoforms, SSU OsAGPS2b which is a product of a seed-specific transcript of OsAGPS2, and LSU OsAGPL2, are localized in the cytosol. Analysis of osagps2 and osagpl2 mutants revealed that a lesion of one of the two cytosolic isoforms, OsAGPL2 and OsAGPS2b, causes a shrunken endosperm due to a remarkable reduction in starch synthesis. In leaves, however, only the osagps2 mutant appears to severely reduce the transitory starch content. Interestingly, the osagps2 mutant was indistinguishable from wild type during vegetative plant growth. Western blot analysis of the osagp mutants and wild type plants demonstrated that OsAGPS2a is an SSU isoform mainly present in leaves, and that OsAGPS2b and OsAGPL2 are the major SSU and LSU isoforms, respectively, in the endosperm. Finally, we propose a spatiotemporal complex model of OsAGP SSU and LSU isoforms in leaves and in developing endosperm of rice plants.
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