ArticlePlant physiology2004
Amino acid metabolism in maize earshoots. Implications for assimilate preconditioning and nitrogen signaling.
Article in Plant physiology, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers.
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Who cites it
31 citing papers in PubMed, 135 citations in OpenAlex.
- ZmPEPCK2 enhances nutritional quality and yield potential by synchronizing carbon and nitrogen metabolism in maize kernels.Plant communications · 2026Article
- Regulating female ear morphogenesis in maize by uniconazole and 5-aminolevulinic acid for yield improvement.Scientific reports · 2026Article
- Physiological and transcriptomic analyses for assessing the effects of uniconazole on female ear development in maize (Zea Mays L.).BMC plant biology · 2026Article
- Designing a nitrogen-efficient cold-tolerant maize for modern agricultural systems.The Plant cell · 2025Review
- ZmCCD8 regulates sugar and amino acid accumulation in maize kernels via strigolactone signalling.Plant biotechnology journal · 2025Article
- Coordinated regulation of the entry and exit steps of aromatic amino acid biosynthesis supports the dual lignin pathway in grasses.Nature communications · 2023Article
- Seasonal Variation of Tropical Savanna Altered Agronomic Adaptation of Stock-6-Derived Inducer Lines.Plants (Basel, Switzerland) · 2022Article
- Near-Infrared Reflectance Spectrophotometry (NIRS) Application in the Amino Acid Profiling of Quality Protein Maize (QPM).Foods (Basel, Switzerland) · 2022Article
- Deciphering Pleiotropic Signatures of Regulatory SNPs inInternational journal of molecular sciences · 2022Article
- Double zero tillage and foliar phosphorus fertilization coupled with microbial inoculants enhance maize productivity and quality in a maize-wheat rotation.Scientific reports · 2022Article
- Impacts of environmental conditions, and allelic variation of cytosolic glutamine synthetase on maize hybrid kernel production.Communications biology · 2021Article
- Rapid Generation and Analysis of a Barley Doubled Haploid Line with Higher Nitrogen Use Efficiency Than Parental Lines by F1 Microspore Embryogenesis.Plants (Basel, Switzerland) · 2021Article
- Genetic engineering to improve essential and conditionally essential amino acids in maize: transporter engineering as a reference.Transgenic research · 2021Article
- Bioactivity of Size-Fractionated and Unfractionated Humic Substances From Two Forest Soils and Comparative Effects on N and S Metabolism, Nutrition, and Root Anatomy ofFrontiers in plant science · 2020Article
- Visualizing Genotypic and Developmental Differences of Free Amino Acids in Maize Roots With Mass Spectrometry Imaging.Frontiers in plant science · 2020Article
- Comparative Proteomic Analysis Unveils Critical Pathways Underlying the Role of Nitrogen Fertilizer Treatment in American Elderberry.Proteomes · 2019Article
- Effects of Two Protein Hydrolysates Obtained From Chickpea (Frontiers in plant science · 2019Article
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- Combining Three Mapping Strategies to Reveal Quantitative Trait Loci and Candidate Genes for Maize Ear Length.The plant genome · 2018Article
- Article
Corrections and comments
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Nitrogen (N) is an essential requirement for kernel growth in maize (Zea mays); however, little is known about how N assimilates are metabolized in young earshoots during seed development. The objective of this study was to assess amino acid metabolism in cob and spikelet tissues during the critical 2 weeks following silking. Two maize hybrids were grown in the field for 2 years at two levels of supplemental N fertilizer (0 and 168 kg N/ha). The effects of the reproductive sink on cob N metabolism were examined by comparing pollinated to unpollinated earshoots. Earshoots were sampled at 2, 8, 14, and 18 d after silking; dissected into cob, spikelet, and/or pedicel and kernel fractions; then analyzed for amino acid profiles and key enzyme activities associated with amino acid metabolism. Major amino acids in the cob were glutamine (Gln), aspartic acid (Asp), asparagine (Asn), glutamate, and alanine. Gln concentrations dropped dramatically from 2 to 14 d after silking in both pollinated and unpollinated cobs, whereas all other measured amino acids accumulated over time in unpollinated spikelets and cobs, especially Asn. N supply had a variable effect on individual amino acid levels in young cobs and spikelets, with Asn being the most notably enhanced. We found that the cob performs significant enzymatic interconversions among Gln, alanine, Asp, and Asn during early reproductive development, which may precondition the N assimilate supply for sustained kernel growth. The measured amino acid profiles and enzymatic activities suggest that the Asn to Gln ratio in cobs may be part of a signal transduction pathway involving aspartate aminotransferase, Gln synthetase, and Asn synthetase to indicate plant N status for kernel development.
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