1-Methylcyclopropene plus high CO<sub>2</sub> applied after storage reduces ethylene production and enhances shelf life of Gala apples
Bibliographic record
Abstract
The effect of a combined treatment comprising a 35% CO2 atmosphere plus 250 nL L-1 1-methylcyclopropene (1-MCP) on shelf life of Gala apples app lied after removal from air or controlled atmosphere (CA) storage was evaluated. Fruit were removed from air storage at 10 and 18 wk and from CA storage at 18 and 22 wk, warmed to 20°C and then treated for 16 h with 1-MCP either in combination with or without 35% CO2. Treated fruit were held at 20°C in air for up to 15 d and assessed every 5 d. Onset of ethylene production was delayed and quality retention was only marginally improved with the 1-MCP treatment. In contrast, both were significantly affected when a 35% CO2 atmosphere was applied in combination with the 1-MCP treatment. Fruit that were treated with 1-MCP in a 35% CO2 atmosphere exhibited the lowest levels of internal ethylene concentration (IEC) and the smallest decline of flesh firmness and titratable acidity (TA) during holding at 20°C. No symptoms of CO2 injury were noted. In the high CO2 atmosphere, a 250 nL L-1 treatment with 1-MCP resulted in similar firmness and titratable acidity retention at room temperature as did a 1000 nL L-1 treatment with 1-MCP. Additionally, the application of the combined 1-MCP/high CO2 treatment after holding at 20°C for 24 h resulted in similar effects as seen if the treatment were applied only 2 h after removal from storage. Biochemical analysis showed that 1-MCP and high CO2 have two distinctly different effects on ACC-synthase activity, explaining the synergistic effect of the combined treatment. Key words: Post-storage ripening, 1-MCP, carbon dioxide, ethylene biosynthesis
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".