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Open research questions in Plant Gene Expression Analysis

37 unresolved questions extracted from the limitations and future-work sections of 262 Plant Gene Expression Analysis papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • These results suggest that LjMYB106 is a candidate regulator of phenylpropanoid and flavonoid metabolism and provide a basis for further studies of MYB-mediated flavonoid regulation in L.

    Heterologous expression of the honeysuckle R2R3-MYB transcription factor LjMYB106 enhances phenylpropanoid and flavonoid metabolism in Arabidopsis thaliana and Nicotiana benthamiana · 2026 · DOI

  • Aspartokinase (LysC) has been proposed as a key enzyme involved in 1-deoxynojirimycin (1-DNJ) biosynthesis in mulberry, yet direct functional evidence remains limited.

    In Vivo Functional Investigation of LysC3 (Aspartokinase 3) Revealed Its Role in Priming the Biosynthesis of 1-Deoxynojirimycin in Mulberry · 2026 · DOI

  • Atmospheric CO2; concentration is projected to rise substantially over the coming decades, yet its impact on the molecular mechanisms governing plant immunity remains poorly understood.

    Elevated CO2 enhances tomato tolerance to Botrytis cinerea through transcriptional and metabolic defence reprogramming · 2026 · DOI

  • Characterization of underexplored 1R-MYB and 3R-MYB members, phylogeny-guided cross-species functional validation, clarification of the mechanisms underlying regulatory polarity divergence, and evaluation of MYB functions under combined stress conditions would contribute substantially to a more comprehensive understanding of plant cold resilience.

    MYB transcription factors in plant cold stress adaptation: integrating phylogeny, signaling networks, and metabolic regulation · 2026 · DOI

  • Future research should prioritize the following directions: 1. Integrating metabolomics, transcriptomics and proteomics with functional validation is essential to establish causal links between secondary metabolites and drought tolerance, particularly in non-model and orphan crops such as finger millet, sorghum and millet species. 2. Moving beyond controlled-environment experiments, candidate genes and pathways should be validated under multi-location field drought conditions to ensure real- world applicability under variable rainfall, soil types and temperature regimes. 3. Identification of metabolite-based biomarkers showing stable expression across environments and developmental stages should be prioritized to improve selection accuracy for drought tolerance breeding programs, particularly through flavonoid and phenolic signatures associated with yield stability under drought stress. 4. Future studies should integrate isotope tracing, metabolomics and systems modelling to improve understanding of carbon allocation toward secondary metabolism under drought stress. 5. Testable hypothesis-driven systems modelling should quantify whether drought- tolerant genotypes exhibit 20–30% higher carbon partitioning from primary metabolism to secondary metabolite pathways using ¹³C-labeling coupled with time- resolved LC–MS across multiple cereal crops. 6. Extending metabolomics-informed selection strategies to underutilized and drought- prone crops will help address current gaps in genetic resource utilization and improve resilience in marginal production systems. 7. Developing systems-level models that link carbon–nitrogen allocation with metabolite production, growth dynamics and yield stability under drought stress is necessary for predictive understanding of trade-offs between productivity and stress adaptation. 8. Evaluate whether overexpression of a single regulatory transcription factor (e.g., TaMYB30 in wheat) can simultaneously enhance lignin and flavonoid biosynthesis without significant yield penalties under moderate drought (≈ 40% field capacity) across multi-environment field trials.

    Adaptive roles of plant secondary metabolites under drought stress conditions · 2026 · DOI

  • To date, genome-wide analyses have identified varying numbers of SWEET genes across plant species, but research on the SWEET gene family in quinoa has not been reported.

    Genome-wide analysis of the SWEET gene family in quinoa and functional study of CqSWEET14 in drought resistance · 2026 · DOI

  • Provitamin A biofortification of cassava (Manihot esculenta) is constrained by a negative genetic correlation between total carotenoid (TC) and dry matter (DM) contents, but its underlying biological mechanism remains unclear.

    Gene-metabolite networks reveal physiological trade-offs but not transcriptional co-regulation between carotenoids and dry matter in cassava (Manihot esculenta) roots · 2026 · DOI

  • For example, inspired by the mutation mecha- nism of the RPGE1 gene in carrots, the functions of genes such as GGPPS and CCD4 could be validated using trans- genic or VIGS (virus-induced gene silencing) techniques.

    Transcriptome and Metabolome Analyses Reveal the Characteristics of the Carotenoid Biosynthetic Pathway in Anthurium andraeanum Linden Spathes · 2026 · DOI

  • In contrast, bulk RNA-seq datasets have accumulated extensively across plant species, tissues, developmental stages, and environmental conditions, yet the celltype-level information embedded in these datasets remains difficult to resolve because plant-oriented deconvolution frameworks are still lacking.

    Anthocyanin-associated cellular programs underlying terroir variation in Cabernet Sauvignon grape berry revealed by SEED-based deconvolution · 2026 · DOI

  • Jasmonates (JAs) are defense-related phytohormones that increase resistance to insect feeding through promoting GSL biosynthesis, but the detailed mechanism of JAs in MI development remains to be fully explored.

    Jasmonates Promote Myrosin Idioblast Cell Development via MYC2-Mediated Activation of the FAMA-bHLH090 Pathway in Arabidopsis · 2026 · DOI

  • The VIGS experiment in banana peel silenced MaHSFA2c and measured outcomes after 5 days at 30 °C, but long-term effects on fruit quality parameters (firmness, sugar content, volatile production) and the reversibility of chlorophyll retention after MaHSFA2c silencing during extended storage remain undetermined.

    MaHSFA2c modulates high temperature-inhibited chlorophyll breakdown in banana fruit by directly inducing the transcription of the E3 ligase gene MaBAH1 · 2026 · DOI

  • The transient overexpression analysis in banana peel was conducted at a single temperature (20 °C) following ethylene treatment for 5 days. Temperature-dependent modulation of the MaHSFA2c-MaBAH1-MaMYB60 pathway across a physiologically relevant range (15-35 °C) with concurrent measurement of chlorophyll breakdown rates and carotenoid accumulation kinetics is absent.

    MaHSFA2c modulates high temperature-inhibited chlorophyll breakdown in banana fruit by directly inducing the transcription of the E3 ligase gene MaBAH1 · 2026 · DOI

  • The ubiquitination assay measured MaMYB60 ubiquitination following MaHSFA2c-induced MaBAH1 expression, but the substrate specificity of the MaBAH1 E3 ligase toward other chlorophyll catabolic regulators and the kinetics of ubiquitin chain assembly (K48 versus K63 linkages) have not been investigated.

    MaHSFA2c modulates high temperature-inhibited chlorophyll breakdown in banana fruit by directly inducing the transcription of the E3 ligase gene MaBAH1 · 2026 · DOI

  • The E3 ligase gene MaBAH1 regulation by MaHSFA2c was demonstrated through promoter analysis containing heat shock elements (HSEs), but the specific HSE binding site spacing, orientation, and cooperative binding with MaMYB60 during high temperature stress have not been systematically characterized through site-directed mutagenesis of individual HSE motifs in the MaBAH1 promoter.

    MaHSFA2c modulates high temperature-inhibited chlorophyll breakdown in banana fruit by directly inducing the transcription of the E3 ligase gene MaBAH1 · 2026 · DOI

  • The ChIP-qPCR analysis used an anti-MaHSFA2c polyclonal antibody validated only against banana fruit peel, in vitro-translated recombinant protein, and tobacco leaves overexpressing MaHSFA2c. Cross-validation of MaHSFA2c chromatin binding across different banana developmental stages, cultivars, and post-harvest storage conditions remains unaddressed.

    MaHSFA2c modulates high temperature-inhibited chlorophyll breakdown in banana fruit by directly inducing the transcription of the E3 ligase gene MaBAH1 · 2026 · DOI

  • The MaHSFA2c-MaBAH1 regulatory pathway was validated primarily in tobacco transient expression systems and Arabidopsis stable overexpression lines. Direct validation of the MaHSFA2c transcriptional activation of MaBAH1 specifically in banana fruit peel tissue under high temperature conditions (beyond the VIGS experiment at 30 °C for 5 days) requires extended temperature gradient studies and multiple ripening stages to establish dose-response relationships.

    MaHSFA2c modulates high temperature-inhibited chlorophyll breakdown in banana fruit by directly inducing the transcription of the E3 ligase gene MaBAH1 · 2026 · DOI

  • Future research will focus on determining whether the identified bHLH–MYB transcription factor complex contributes to flavonoid biosynthesis within lily bulbs.

    Integrative metabolomic and transcriptomic profiling deciphers flavonoid biosynthesis of bulbs in Lilium brownii var. Viridulum · 2026 · DOI

  • The structural and functional organization of the R2R3-Myb and bHLH gene families is already well studied, while the genes encoding the third component of the MBW complex in the representatives of Triticeae, the WD40 factor, remain scarcely studied.

    Structural and Functional Organization and Evolution of the WD40 Genes Involved in the Regulation of Flavonoid Biosynthesis in the Triticeae Tribe · 2019 · DOI

  • As a member of tyrosinase-related family, tyrosinase-related protein-1 (TYRP1) has been reported to play an important role in melanin biosynthetic pathway in some species, but little is known about its role in goat.

    Characterization and SNP identification of goat TYRP1 gene · 2012

  • Shading is a common agronomic practice in cigar tobacco cultivation to improve wrapper leaf quality, yet its morphological and molecular effects across different cultivars remain underexplored.

    Differential co-expression modules underpin genotype-specific adaptation to shading in cigar tobacco: Linkages to sugar metabolism and leaf morphology · 2026 · DOI

  • While abscisic acid (ABA) plays a crucial role in cold stress, its regulatory mechanisms remain unclear.

    ABA-mediated COP9 SIGNALOSOME SUBUNIT 1 (BcCSN1) enhances cold tolerance in non-heading Chinese cabbage by stabilizing the BcICE1 protein · 2026 · DOI

  • However, the mechanisms underlying the biosynthesis and metabolism of organic acids (citric and malic acids) in strawberries—especially those influenced by ethylene signaling—remain inadequately understood.

    Ethylene regulates organic acid metabolism in strawberry via the FaMAP3K–FaERF13–FaKAT module · 2026 · DOI

  • Drought is a major abiotic stress threatening plant productivity and agricultural sustainability, yet the molecular mechanisms underlying adaptive root responses to water deficit in the water use strategies continuum remain insufficiently understood, particularly in perennial crops.

    Non-plastic gene expression underlies root phenotypes involved in drought adaptation in Vitis spp. · 2026 · DOI

  • Although significant progress has been made in understanding epigenetic modifications and their roles in fruit ripening, the regulatory network underlying these complex relationships remains incompletely elucidated.

    Regulatory mechanisms of fruit ripening: an insight from DNA, histone, and RNA modifications · 2026 · DOI

  • Moving forward, future research should focus on functional valida- tion, employing approaches such as genetic transformation to confirm the roles of core regulatory components.

    Transcriptome and miRNAome analysis reveals expression profiles of platycodin biosynthesis-related genes and their potential miRNA regulators in Platycodon grandiflorus under high-temperature stress · 2026 · DOI

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37 open questions have been extracted from the limitations and future-work passages of 262 Plant Gene Expression Analysis papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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