ArticlePlant physiology2001
Molecular structure of three mutations at the maize sugary1 locus and their allele-specific phenotypic effects.
Article in Plant physiology, 2001. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 50 papers.
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50 citing papers in PubMed, 151 citations in OpenAlex.
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- Adoption of Standard Reference SNP Identifiers in Agricultural Genomics for Interoperability and Data Reuse.Scientific data · 2026Article
- Enrichment of phytoglycogen in sweet corn kernels through genomics-assisted selection.Functional & integrative genomics · 2025Article
- Noncatalytic functions of ISOAMYLASE 1 and 2 affect the proportion of insoluble and soluble α-polyglucans in maize.The Plant cell · 2025Article
- Interactions of separately conserved α-(1→6) glucosidases that participate in maize endosperm starch biosynthesis.Plant physiology · 2025Article
- Modulation of the Arabidopsis Starch Metabolic Network by the Cytosolic Acetyl-CoA Pathway in the Context of the Diurnal Illumination Cycle.International journal of molecular sciences · 2024Article
- NAKED ENDOSPERM1, NAKED ENDOSPERM2, and OPAQUE2 interact to regulate gene networks in maize endosperm development.The Plant cell · 2023Article
- Soluble and insoluble α-glucan synthesis in yeast by enzyme suites derived exclusively from maize endosperm.Plant physiology · 2023Article
- FLOURY ENDOSPERM 6 mutations enhance the sugary phenotype caused by the loss of ISOAMYLASE1 in barley.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2023Article
- Genetic basis of the oil biosynthesis in ultra-high-oil maize grains with an oil content exceeding 20.Frontiers in plant science · 2023Article
- Transcriptome-wide association and prediction for carotenoids and tocochromanols in fresh sweet corn kernels.The plant genome · 2022Article
- Allelic variation in sugary1 gene affecting kernel sweetness among diverse-mutant and -wild-type maize inbreds.Molecular genetics and genomics : MGG · 2021Article
- Integrating Omics and Gene Editing Tools for Rapid Improvement of Traditional Food Plants for Diversified and Sustainable Food Security.International journal of molecular sciences · 2021Review
- Genome assembly and population genomic analysis provide insights into the evolution of modern sweet corn.Nature communications · 2021Article
- Starch and Glycogen Analyses: Methods and Techniques.Biomolecules · 2020Review
- A New SNP in Rice Gene Encoding Pyruvate Phosphate Dikinase (PPDK) Associated with Floury Endosperm.Genes · 2020Article
- MaizeProceedings of the National Academy of Sciences of the United States of America · 2019Article
- The Proteomic Analysis of Maize Endosperm Protein Enriched by Phos-tagInternational journal of molecular sciences · 2019Article
- Starch formation inside plastids of higher plants.Protoplasma · 2018Review
- Carbohydrate reserves and seed development: an overview.Plant reproduction · 2018Review
Corrections and comments
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Starch production in all plants examined is altered by mutations of isoamylase-type starch-debranching enzymes (DBE), although how these proteins affect glucan polymer assembly is not understood. Various allelic mutations in the maize (Zea mays) gene sugary1 (su1), which codes for an isoamylase-type DBE, condition distinct kernel phenotypes. This study characterized the recessive mutations su1-Ref, su1-R4582::Mu1, and su1-st, regarding their molecular basis, chemical phenotypes, and effects on starch metabolizing enzymes. The su1-Ref allele results in two specific amino acid substitutions without affecting the Su1 mRNA level. The su1-R4582::Mu1 mutation is a null allele that abolishes transcript accumulation. The su1-st mutation results from insertion of a novel transposon-like sequence, designated Toad, which causes alternative pre-mRNA splicing. Three su1-st mutant transcripts are produced, one that is nonfunctional and two that code for modified SU1 polypeptides. The su1-st mutation is dominant to the null allele su1-R4582::Mu1, but recessive to su1-Ref, suggestive of complex effects involving quaternary structure of the SU1 enzyme. All three su1- alleles severely reduce or eliminate isoamylase-type DBE activity, although su1-st kernels accumulate less phytoglycogen and Suc than su1-Ref or su1-R4582::Mu1 mutants. The chain length distribution of residual amylopectin is significantly altered by su1-Ref and su1-R4582::Mu1, whereas su1-st has modest effects. These results, together with su1 allele-specific effects on other starch- metabolizing enzymes detected in zymograms, suggest that total DBE catalytic activity is the not the sole determinant of Su1 function and that specific interactions between SU1 and other components of the starch biosynthetic system are required.
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