Lettucenin A and Its Role against Xanthomonas Campestris
Bibliographic record
Abstract
Lettucenin A is the major phytoalexin produced in lettuce after being elicited by biotic or abiotic elicitors. Theproduction of lettucenin A in leaf can be induced by 5% of CuSO4 and 1% of AgNO3. A clear inhibition zone where thefungi Aspergillus niger failed to develop on TLC plates dipped in hexane: ethyl acetate (1:1, v/v) at Rf 0.45 wasobserved. Lettucenin A was detected at a retention time of approximately 5.3 min after being injected into the HPLCrun with isocratic solvent system containing water: acetonitrile ratio 60:40, (v/v). In vitro antibacterial study withXanthomonas campestris results showed this pathogen has different sensitivity to all tested concentrations of lettuceninA. The bacteria was more sensitive to higher concentration of lettucenin A (333, 533 and 667 g ml-1), compare tolower concentrations such as 67 g ml-1. Thus, the relationship between the bacteria growth rate and lettucenin Aconcentration was negatively correlated. However, the bacteria growth rate continues to increase after two hours ofincubation. Hence, it is suggested that X. campestris may have the ability to detoxify lettucenin A. The success orfailure of X. campestris to invade lettuce may very well depend on the balance between accumulation and degradationof lettucenin A at the invading sites of lettuce. In summary, lettucenin A may play an important role in the resistance oflettuce against microbial colonization.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".