ArticlePlanta2025
Nitrogen form modulates carbon and nitrogen metabolism and assimilates partitioning to shape maize ear development.
Article in Planta, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
1 citing paper in PubMed.
- Nitrogen form substitution identifies nitrogen use efficiency management pathways in maize.Physiology and molecular biology of plants : an international journal of functional plant biology · 2026Article
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2 authors.
Funding
Abstract
MAIN
conclusionNitrogen (N) deficiency in maize modulates carbon (C) and N metabolism by enhancing biomass allocation towards vegetative organs, suppressing sucrolytic activity and gene expression, inhibiting ear sink strength and increasing vegetative competition for assimilates, and causing C accumulation in developing maize ears due to inefficient C utilization. Nitrogen (N) form influences carbon (C) and N metabolism, thereby shaping maize growth and development. However, the mechanisms modulating C assimilate allocation to ears under different N forms remain unclear. This study investigated C metabolism and spatial distribution in the mini maize line TX-40 J, supplied with four N treatments: 1 mM NO₃⁻ (low N, LN), 2 mM NO₃⁻ (medium N, MN), 10 mM NO₃⁻ (high N, HN), and 1 mM NH₄⁺ (low ammonium, LA). LN significantly reduced shoot and ear biomass, producing smaller cobs, while stimulating root proliferation and increasing shoot-to-ear (S/E), root-to-ear (R/E), and root-to-shoot (R/S) ratios. Maize developing ears under LN accumulated less carbohydrates (sucrose, glucose, fructose, starch) and exhibited reduced activities of key enzymes (SPS, SuSy, SS, CINV, VINV, AGPase). Diurnal and spatial analysis showed impaired assimilate translocation, with sugars and starch significantly retained in source tissues. Gene expression analyses showed that genes involved in sucrose metabolism and transporter genes (ZmSPS, ZmSuSy, ZmCINV, ZmSWEET, ZmSUT), and starch biosynthetic genes (ZmAGPase, ZmSS) were differentially regulated by N treatments in developing ear tissues. Compared with HN, MN and LA plants, LN-treated plants exhibited markedly lower expression of these genes, suggesting reduced carbohydrate synthesis and impaired sink allocation under N deficiency. Correlation analysis further linked increased vegetative-to-reproductive ratios with reduced nutrient deposition in ears. Collectively, LN triggered metabolic reprogramming that supported vegetative retention over reproductive investment, weakening sink strength and yield potential. These findings provide mechanistic insight into N form-dependent regulation and inform strategies to improve nutrient use efficiencies.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.