Spatial regulation of cell-wall structure in response to heavy metal stress: cadmium-induced alteration of the methyl-esterification pattern of homogalacturonans
Bibliographic record
Abstract
BACKGROUND AND AIMS: In flax hypocotyls, cadmium-induced reorientation of growth coincides with marked changes in homogalacturonan (HGA) epitopes that were recognized by JIM7 and JIM5 antibodies in the external tangential wall of the epidermis. In the present study, LM7 and 2F4 monoclonal antibodies were used, in addition to JIM5 and JIM7, to extend the investigation on the methyl-esterification pattern of HGA within various domains of the cortical tissues, including the cortical parenchyma where cell cohesion is crucial. METHODS: The PATAg (periodic acid thiocarbohydrazide-silver proteinate) test was applied to ultrathin sections so that the polysaccharides could be visualized and the ultrastructure studied. The monoclonal LM7, JIM5 and JIM7 antibodies that recognize differently methyl-esterified HGA were used. The monoclonal 2F4 antibody that is specific to a particular polygalacturonic acid conformation induced by a given calcium to sodium ratio was also applied. After immunogold labelling, the grids were stained with uranyl-acetate, the samples were observed using a transmission electron microscope and the gold particles were counted. KEY RESULTS: In the presence of cadmium, the increase of LM7 labelling in external tangential wall of the epidermis, together with a decrease of JIM7 labelling, suggested a specific role for randomly partially de-esterified HGA to counteract the radial swelling stress. Enhanced JIM5 and 2F4 labelling in the junctions of the inner tissues indicated that the presence of blockwise de-esterified HGA might oppose cell separation. CONCLUSIONS: The response of the hypocotyl to cadmium stress was to adapt the structure of the wall of cortical tissues by differently modulating the methyl-esterification pattern of HGA in various domains.
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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) | 0.000 | 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".