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Open research questions in Plant nutrient uptake and metabolism

567 gap statements mined from Plant nutrient uptake and metabolism papers in our 7.9M-paper local library, which holds 2,050 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • This hypothesis, including the potential involvement of PHR1/SPX-mediated phosphate signaling and jasmonate-responsive transcription factors, remains to be experimentally validated in future studies.

    Genome-Wide Characterization of Phosphate Transporters Reveals Differential Regulation of Growth and Medicinal Metabolite Accumulation Under Phosphorus Deficiency in Ginkgo biloba · 2026 · DOI

  • How long the effect persists, and whether it survives repeated transfer, remain open questions.

    Low soil phosphorus conditioning enhances mutualism in Rhizophagus irregularis regardless of nuclear organization, even when phosphorus conditions shift · 2026 · DOI

  • It highlights the need for further research on the impact of glutamine on plant growth and stress adaptation under challenging environmental conditions.

    Glutamine-Driven Nitrogen Regulation and Defense Mechanisms in Rice: Insights into Signaling and Stress Adaptation · 2026 · DOI

  • Future research should address these gaps through two approaches: (1) multi-location field trials to optimize application strategies for different frost risk scenarios, and (2) transcriptomic and metabolomic profiling to identify SF + MT-responsive gene networks that underpin cold tolerance.

    Physiological and Agronomic Evaluation of Starter Fertilizer and Melatonin Combined to Enhance the Cold Resistance of Sugar Beet Seedlings · 2026 · DOI

  • Although significant progress has been made, the following directions warrant further in-depth exploration: (1) Depth and specificity of signaling networks: it is necessary to validate the conservation of key regulatory modules in major crops and to dissect the dynamic cross-talk networks between MeJA signaling and other pathways (e.g., strigolactone and nitric oxide) using multi-omics techniques.

    Regulation of photosynthesis by exogenous MeJA under phosphorus deficiency: a review · 2026 · DOI

  • However, the present study establishes a correlation rather than a causal relationship, and the proposed mechanistic link between EgKT2-1-mediated K⁺ transport and oil biosynthesis remains to be further validated.

    EgKT2-1, an inwardly rectifying Shaker-type potassium channel in oil palm that correlates with oil yield · 2026 · DOI

  • The presence of two AKT2 homologs in oil palm further raises the possibility that these channels fulfill distinct physiological functions, although this hypothesis remains to be experimentally tested.

    EgKT2-1, an inwardly rectifying Shaker-type potassium channel in oil palm that correlates with oil yield · 2026 · DOI

  • The study did not consider the effects of fertilization, weeding, or residue removal. The experimental plots were selected under comparable topographic conditions, which may not represent all karst regions. The study only considered a limited number of medicinal species.

    Multi-element stoichiometric regulation and nutrient coupling in karst agroforestry systems: implications for sustainable land management · 2026 · DOI

  • The research highlights the need to investigate the implications for sustainable land management. The study notes that previous studies have not fully addressed the role of species identity in shaping nutrient organization across agroforestry systems.

    Multi-element stoichiometric regulation and nutrient coupling in karst agroforestry systems: implications for sustainable land management · 2026 · DOI

  • Collectively, these data establish BnCLV1 as a central rheostat in a CLE-CLV1–WUS feedback loop that reallocates biomass from reproductive sinks to root exploratory growth when external N is scarce.

    Natural allelic variation in BnCLV1 orchestrates root architectural remodelling and yield performance under nitrogen-limited conditions in Brassica napu · 2026 · DOI

  • Leaf disk assays showed that leaf tissue has a high capacity to take up these amino acids; their transport from roots to leaves via the vascular system remains to be confirmed by direct tracing.

    Mechanistic Insights into the Uptake and Adsorption Kinetics of Kiperin Dihydrolyzed Collagen in Radish Seedlings · 2026 · DOI

  • First, direct binding of StPHR1 to downstream target genes has not yet been verified by ChIP-seq or electrophoretic mobility shift assays, and its direct targets remain to be identified at the genome-wide level. Third, the tuber yield results are based on pot experiments; yield stability and phosphorus use efficiency under diverse field conditions remain to be tested.

    The potato (Solanum tuberosum L.) transcription factor StPHR1 responds to low phosphate stress and regulates phosphorus accumulation · 2026 · DOI

  • The efficacy of this framework is demonstrated by its ability to reconcile seemingly conflicting objectives, deep rooting (DRO1) can be fine-tuned with shallower exploration (EGT1); rapid stomatal closure is balanced with swift reopening to minimize carbon starvation; and osmoprotection is optimized for efficiency rather than sheer volume.

    Overcoming the Yield-Survival Trade-Off in Cereals: An Integrated Framework for Drought Resilience · 2025 · DOI

  • While CpNADP-IDH1 potentially represents a good candidate gene for molecular breeding of citrus and a target gene for developing acid-reducing cultivation technology in the citrus industry, further research is required to address the relative importance of other IDH family members in regulating citric acid turnover under particular environmental and/or stress conditions.

    Identification of the Grapefruit (Citrus paradisi) Isocitrate Dehydrogenase Gene and Functional Analysis of CpNADP-IDH1 in Citric Acid Metabolism · 2025 · DOI

  • The effects of balanced fertilization on the nutritional and flavor qualities of tomato plants are not well understood. There is a need to investigate the impact of fertilizer treatments on various components of tomato fruits.

    Balanced Fertilization Enhances the Nutritional Value and Flavor Profile of Tomato Fruits · 2024 · DOI

  • Limited understanding of the domain landscape and its innovative facets. Gaps in the research on the use of these microorganisms in different soil conditions and agricultural systems.

    Use of Phosphorus-Solubilizing Microorganisms as a Biotechnological Alternative: A Review · 2024 · DOI

  • The lack of use of ammonia-assimilating bacteria in agriculture to reduce nitrogen fertilizer losses. The need to investigate the effects of ammonia-assimilating bacteria on wheat growth and nitrogen utilization. The gap in understanding the mechanisms by which ammonia-assimilating bacteria promote plant growth and nitrogen accumulation.

    Ammonia-Assimilating Bacteria Promote Wheat (Triticum aestivum) Growth and Nitrogen Utilization · 2024 · DOI

  • The study aims to clarify the mechanism by which P and K affect N, which is not well understood. The paper seeks to formulate NPK fertilization methods that can maintain plant nutrient homeostasis, which is a gap in current practices.

    Effects of Phosphorus and Potassium Supply on Photosynthetic Nitrogen Metabolism, Nitrogen Absorption, and Nitrogen Utilization of Hydroponic Rice · 2024 · DOI

  • Glutamine (Gln) is critical for nitrogen utilization in rice, regulating key genes and enzymes such as nitrate reductase and glutamine synthetase, thereby influencing various metabolic pathways, ensuring proper nutrient-dependent carbon/ nitrogen (C/N) metabolism for optimal energy use, and activating defense mechanisms against a range of pathogens.

    Glutamine-Driven Nitrogen Regulation and Defense Mechanisms in Rice: Insights into Signaling and Stress Adaptation · 2026 · DOI

  • This paper explores the core role of N and K nutrition in plants and their interaction mechanisms. N and K exhibit significant synergistic and antagonistic effects in root absorption and transport (such as synergistic/antagonistic absorption), photosynthesis (synergistically optimizing gas conduction and N allocation, enhancing PNUE), signal transduction, and metabolic regulation.

    Progress in the Study of Plant Nitrogen and Potassium Nutrition and Their Interaction Mechanisms · 2025 · DOI

  • Nitrogen (N) fertilizer application increases forests’ productivity and enhances the carbon sequestration of forest stands. However, overuse of N fertilizers increases the release of nitrous oxide (N2O), a greenhouse gas more harmful to global warming than CO2. Therefore, it is urgent to improve the NUE of forest ecosystem to reduce the application of N fertilizer.

    The Utilization and Roles of Nitrogen in Plants · 2024 · DOI

  • Computational prediction tools have variable accuracy across compartments, - Experimental validation is needed, particularly for mitochondrial…

    Sorghum Metabolic Atlas: A fluorescent protein‐based subcellular localization resource for sorghum enzymes · 2026 · DOI

  • Examining the effects of long-term N addition on leaf-root trait relationships, - Investigating the mechanisms underlying the species-dependent responses to N addition, - Studying the relationships between leaf and root traits in other plant functional…

    Leaf-root trait relationships in Fabaceae and Poaceae forage species under contrasting nitrogen addition forms and levels · 2026 · DOI

  • The study only analyzed maize roots, - The experiment was conducted in a controlled environment, - The sample size was limited to one maize inbred line…

    Multi-Omics Analysis Reveals the Transcriptional Regulatory Network of Maize Roots in Response to Nitrogen Availability · 2024 · DOI

  • Investigating the molecular mechanisms underlying N utilization in maize, - Exploring the interactions between transcriptional and translational responses, - Deciphering the role of translation in maize roots response to N…

    Multi-Omics Analysis Reveals the Transcriptional Regulatory Network of Maize Roots in Response to Nitrogen Availability · 2024 · DOI

Most-cited papers in Plant nutrient uptake and metabolism

Most recent work

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Open questions raised by papers listed on this page include: (1) This hypothesis, including the potential involvement of PHR1/SPX-mediated phosphate signaling and jasmonate-responsive transcription factors, remains to be experimentally validated in future studies (“Genome-Wide Characterization of Phosphate Transporters Reveals Differential…”, 2026); (2) How long the effect persists, and whether it survives repeated transfer, remain open questions (“Low soil phosphorus conditioning enhances mutualism in Rhizophagus irregularis…”, 2026); (3) The presence of two AKT2 homologs in oil palm further raises the possibility that these channels fulfill distinct physiological functions, although this hypothesis remains to be experimentally tested (“EgKT2-1, an inwardly rectifying Shaker-type potassium channel in oil palm that…”, 2026); (4) These data establish BnCLV1 as a central rheostat in a CLE-CLV1–WUS feedback loop that reallocates biomass from reproductive sinks to root exploratory growth when external N is scarce (“Natural allelic variation in BnCLV1 orchestrates root architectural remodelling…”, 2026); (5) Leaf disk assays showed that leaf tissue has a high capacity to take up these amino acids; their transport from roots to leaves via the vascular system remains to be confirmed by direct tracing (“Mechanistic Insights into the Uptake and Adsorption Kinetics of Kiperin…”, 2026). 567 gap statements have been mined from Plant nutrient uptake and metabolism papers in our 7.9M-paper local library, which holds 2,050 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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