Role of Phloem Metabolites in Plant Defense
Bibliographic record
Abstract
The primary function of phloem is nutrient translocation, yet cell types within this tissue have been implicated as important contributors to the synthesis, distribution, and release of myriad defense compounds in many plants. This chapter presents examples of selected phloem metabolites with putative or established roles in plant-insect interactions. Toxic quinolizidine alkaloids are associated with the phloem of wild lupins and prevent the feeding of most generalist insects. Other defensive metabolites found in sieve-tube sap include glucosinolates, which are sulfur- and nitrogen-rich specialized metabolites that accumulate in many members of the Brassicaceae. In all conifers studied to date, phloem has been found to contain specialized axial parenchyma cells that produce and accumulate defensive phenolic compounds within their vacuoles. The accumulation of defensive metabolites in sieve-tube sap, laticifers, and resin ducts exposed to insects and microbial pathogens is often the final step of a complex series of biochemical events.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.025 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".