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Open research questions in Plant Parasitism and Resistance

115 gap statements mined from Plant Parasitism and Resistance papers in our 4.5M-paper local library, which holds 585 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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  • SLs should now be regarded not simply as branching inhibitors or rhizosphere-derived signals, but as integrative regulators of abiotic stress adaptation that connect hormonal crosstalk, developmental plasticity, and multilevel stress defense. Across drought, salinity, heavy metal toxicity, heat, and cold, the evidence synthesized in this review shows that SLs coordinate stomatal regulation, root–shoot balance, antioxidant defense, osmotic and ionic adjustment, membrane stabilization, photosynthetic protection, and rhizosphere-assisted resource acquisition. Their interactions with abscisic acid, auxin, cytokinin, ethylene, and gibberellin further explain why SL-mediated responses are highly context-dependent yet re- peatedly converge on a common adaptive outcome: improved compatibility among growth restraint, survival, and recovery under adverse environments. In this sense, SL-mediated stress resilience is best understood as a systems-level phenomenon rather than the conse- quence of a single linear pathway. At the same time, the translational potential of SL biology remains only partly realized. Future studies should therefore prioritize field validation, crop-specific optimization, and the development of SL-based strategies that improve stress tolerance without compromising yield, disrupting beneficial microbiomes, or increasing the risk of parasitic weeds. In addition, integrated omics and genetic approaches are needed to map SL–hormone crosstalk at higher resolution. Comparative transcriptomics, proteomics, metabolomics, hormone profiling, chromatin-level analyses, single-cell/nucleus RNA se- quencing, and spatial transcriptomics should be combined with SL-deficient, SL-insensitive, and hormone-signaling mutants, grafting systems, reporter lines, and CRISPR/Cas-edited materials. These approaches will allow SL-mediated stress responses to be mapped at cell-type and spatial resolution, helping to distinguish organ-wide stress acclimation from localized regulatory events in guard cells, vascular tissues, root tips, epidermal cells, and reproductive tissues. Such studies will help distinguish core SL–hormone modules shared across multiple stresses from stress-specific nodes operating under drought, salinity, heavy- metal toxicity, heat, or cold. Greater integration of physiology, chemical biology, genetics, genome editing, microbiome science, and agronomy will be essential to determine when, where, and in which crop systems SL-based interventions provide a reliable advantage. In particular, paired plant-performance and rhizosphere-microbiome analyses under field con- ditions are needed to quantify how much of SL-mediated stress tolerance is plant-intrinsic and how much is mediated indirectly through AMF, rhizobia, plant-growth-promoting bacteria, fungal communities, or broader soil-microbial networks. If these priorities are addressed, SL research is well-positioned to contribute meaningfully to the development of climate-resilient, resource-effic

    Strigolactones in Plant Abiotic Stress Resilience: Hormonal Crosstalk, Mechanistic Regulation, and Agricultural Prospects · 2026 · DOI

  • Still, very little is known regarding how the modulation of SL-related gene expression can affect the plants’ responses to salt and/or heat stress.

    Are Strigolactones Relevant for Arabidopsis Co-exposed to Heat and Salt Stress? – Exploring the Role of MAX2 and MAX3 in Stress Responses and Physiological Performance · 2026 · DOI

  • The mechanism of flooding inhibition on broomrape seed germinability remains unknown and may be associated with anaerobic soil conditions that disrupt seed metabolism (Conte et al.

    Evaluation of branched broomrape ( Phelipanche ramosa ) seed responses to nitrogen fertilizers and flooding · 2026 · DOI

  • Future research should focus on clinical trials to validate these findings and explore the precise molecular mechanisms underlying its therapeutic effects. Additionally, further investigation into the pharmacokinetics and optimal dosage of A.

    Phytochemical and Molecular Insights Into the Anti-PCOS Potential of Anchusa Strigosa: Targeting Hormones, Biochemical Markers, and WNT Genes · 2026 · DOI

  • Future research should focus on bridging the gaps in our understanding of genotype-microbiome interactions, particularly how plant genetic traits influence microbial recruitment and community structure.

    Unveiling the rhizosphere microbiome of Dendrobium: mechanisms, microbial interactions, and implications for sustainable agriculture · 2025 · DOI

  • The interacting effects of genes, hormones, and environmental factors on rice tillers should be further explored to reveal the underlying mechanisms of the difference in rice tillering ability and provide strategies for early-onset rice varieties breeding.

    The Formation of Rice Tillers and Factors Influencing It · 2024 · DOI

  • Finally, this review suggests that future research should focus on elucidating the dynamic responses to environmental stress mediated by the SL pathway, decoding the functional diversification of SLs in different plant species, and leveraging SLs as rhizosphere signals to control parasitic weeds.

    Strigolactone‐mediated architecture regulation and stress resilience: Insights and innovations for crop breeding · 2026 · DOI

  • The salicylic acid (SA) signal transduction pathway and its association with anthocyanin biosynthesis have been reported, but the molecular mechanisms underlying SA-mediated anthocyanin biosynthesis remain unclear.

    The NPR7–TGA6–MYB1 module promotes anthocyanin biosynthesis and integrates salicylic acid and strigolactone signaling in apple · 2026 · DOI

  • However, the mechanisms underlying apple adaptation to varying chilling durations remain elusive.

    Chilling-responsive strigolactone signaling orchestrates bud break and chilling tolerance in apple · 2026 · DOI

  • While secondary ears drive yield variability under prolificacy-favoring conditions, the mechanisms governing ear formation across shoot positions remain poorly understood.

    Transcriptional and phytohormonal regulation of positional ear development reveals yield strategies in maize · 2026 · DOI

  • Hemiparasitic mistletoes reallocate host water and carbon, yet it remains unclear when their costs are greatest and whether parasites shift cambial timing or mainly constrain the amount of wood produced.

    When parasites bite hardest: mistletoe effects on oak radial growth peak near climatic optima · 2026 · DOI

  • Abstract Mycoheterotrophic plants rely entirely on fungal symbionts for nutrients, yet the role of intraspecific genomic variation in shaping symbiotic adaptation remains unclear.

    Chromosome-level genome assembly and population genomics unveil strigolactone-regulated growth adaptation in the mycoheterotrophic orchid Gastrodia elata · 2026 · DOI

  • Strigolactones, as plant hormones, play multiple roles in plant growth and development, but their involvement in biotic stress responses remains poorly understood.

    Strigolactone enhances aphid resistance by increasing antioxidant enzyme activity in cucumber · 2026 · DOI

  • However, despite their ecological relevance, how iron is stored in Tristerix fruits and embryos, and the developmental mechanisms underlying this process, remain unknown.

    Iron-ferritin accumulation in fruits of two Tristerix epiphytic plants: ecological relevance as nutritional source for frugivores · 2026 · DOI

  • BACKGROUND AND AIMS: Pollinator-mediated selection is a primary driver of floral trait evolution, yet how far phylogenetic history constrains this process remains poorly understood in aerial parasitic plants, whose reproduction depends entirely on animal mutualists.

    Floral morphology tracks divergence time despite radical ecological shifts in southern South American mistletoes · 2026 · DOI

  • Underexplored Microbial Species in the Pipeline for the Development of Biopesticides.

    Alternaria alternata JTF001 Metabolites Recruit Beneficial Microorganisms to Reduce the Parasitism of Orobanche aegyptiaca in Tomato · 2025 · DOI

  • While plant communication via HIPVs has been well-documented over the past few decades, key aspects, such as the specific biochemical mechanisms underlying defence activation in neighboring plants and the variation in response to herbivory, remain poorly understood.

    Signals from aphid-infested neighboring plants modify aphid performance and host plant biochemistry · 2025 · DOI

  • mearnsii exhibits allelopathic activity, though its ecological significance remains unclear.

    Mechanisms and Impact of Acacia mearnsii Invasion · 2025 · DOI

  • The rapid development of multi‐omics approaches has greatly improved our understanding of the diversity, composition, and functions of plant microbiomes, but how global climate change affects the assembly of plant microbiomes and their roles in regulating host plant adaptation to changing environmental conditions is not fully known.

    Plant–microbiome interactions and their impacts on plant adaptation to climate change · 2025 · DOI

  • Specifically, this review addresses critical gaps in the understanding of serotonin's function in plants by examining its biosynthesis, metabolism, and its multifaceted role in mitigating both abiotic stresses (salinity, drought, heat, cold, and heavy metals) as well as biotic challenges (pathogens, pests, and herbivores).

    Role of serotonin in plant stress responses: Quo vadis? · 2025 · DOI

  • However, the molecular regulatory network underlying the crosstalk between the SL and GA signaling pathways remains poorly understood.

    The MdSINA1‐MdWOX8‐ MdHY5 module links strigolactone and gibberellin signals via interaction with MdSMXL8 and MdRGL3a in the regulation of anthocyanin biosynthesis in apple · 2025 · DOI

  • Nevertheless, largescale, taxon-based analyses at higher taxonomic levels remain comparatively under-explored.

    The spatial distributional pattern of seed plants and its future advances · 2025 · DOI

  • The phytohormone jasmonate regulates Arabidopsis thaliana seed size, but the underlying molecular mechanisms remain elusive.

    Jasmonate signaling coordinates with the SOD7–KLU pathway to regulate seed size in Arabidopsis thaliana · 2025 · DOI

  • However, the mechanisms underlying SLs-mediated drought stress alleviation in fodder soybean remain poorly understood.

    Strigolactones enhances fodder soybean (Glycine max) adaptation to drought by GmPP2C56 mediating ABA signaling pathway · 2025 · DOI

  • However, comparative assessments of mistletoe effects on these two processes are scarce, particularly at different spatial scales.

    Mistletoe negatively impacts vigor, growth and reproduction of silver fir forests at regional and local scales · 2025 · DOI

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115 gap statements have been mined from Plant Parasitism and Resistance papers in our 4.5M-paper local library, which holds 585 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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