Response of barley, field pea, canola and tree seedlings to ethylene exposure : Alberta's ethylene/crop research project : report III /
Notice bibliographique
Résumé
The Alberta Ethylene Crop Research Project was a multi-stakeholder initiative to investigate the response of selected cultivars of agricultural crops of interest to Alberta producers to ethylene exposure.The goals of the project were to:• Provide scientific information to Alberta Environment for further development of ambient air quality guidelines for ethylene, and to ,• Provide the petrochemical industry and communities adjacent to petrochemical facilities with scientific information for site-specific risk assessment. ApproachThis research project was conducted in three phases.The results of the first two phases, development of a growth chamber system for ethylene exposures and the evaluation of crop and cultivar sensitivity to ethylene, have been presented in earlier reports.The results presented in this report describe the responses of barley cv.Harrington, canola cv.Quantimi and field pea cv.Carrera to a range of ethylene exposure regimes and concentrations.An examination of the effects of short-term ethylene exposure on white spruce and lodgepole pine seedlings was also conducted.On the basis of the results of these experiments, an examination of mathematical evaluations of responses to ethylene exposures was conducted to assist in the interpretation and application of the results in guideline development and risk assessment.For the purpose of this study, effects of ethylene on yield were deemed more important than effects on vegetative characteristics.This is the third and final phase of the project. Summary of Conclusions1.No significant effects of short-term exposure to ethylene, up to 1200 ppb for 12 hours, were observed on vegetative and reproductive characteristics in barley, field pea and canola.Similarly, no effects of short-term exposures to ethylene, up to 1200 ppb for 12 hours, were observed on seed germination, seedling vigour, growth in the rapid growth phase, and seedling marketability in lodgepole pine and white spruce.2. Several vegetative and reproductive symptoms of ethylene exposure were observed in the three crop species studied in long-term exposure.Ethylene symptoms appeared earliest in field pea and symptoms were most noticeable.Photographs of these symptoms are contained within this report.3. Barley cv.Harrington is more sensitive to ethylene exposure than field pea cv.Carrera and canola cv.Quantum.For this reason, the majority of the experiments were conducted using barley.4. The response of plants to long-term ethylene exposure depends on both concentration and length of exposure.Minimum ethylene concentrations and length of exposure that are required to cause an effect are species-specific.Barley yields were reduced significantly when plants were exposed to 50 ppb ethylene for 3 days, while no significant decrease in seed yield of field pea was observed when plants were exposed to 50 ppb ethylene for up to 26 days.5. The ability to recover from the effects of long-term ethylene exposure is speciesspecific.Significant reductions in yield of field pea were observed in plants exposed to ethylene at concentrations above 100 ppb for 16 days, however, given sufficient time following treatment, complete recovery of yield in field pea was observed.Barley and canola did not appear to have the recovery abilities of field pea.6.The sensitivity of barley varies with the time of day of ethylene exposure.Barley was most sensitive to ethylene during the middle of the day [between 10:00 a.m. and 4:00 p.m.]. 7. Exposure of barley plants to an ethylene pattern derived from ambient air monitoring data from the worst month of exposure seen at a petrochemical facility in Alberta over a three year period had no significant effect on yield.Exposure was at the most sensitive stages of barley growth and reproductive development.\ , iv 8. Intermittent exposure experiments indicated that exposure of barley to five intermittent exposures of 250 ppb ethylene caused a reduction in yield.Significant experimental difficulties were encountered in this part of the work.Intervals as long as 5 days between exposures were not sufficient to allow for complete recovery.9.The application of mathematical expressions of dose to the data indicate that the interim 6-hour Alberta Air Quality Ethylene Guideline (120 |j.g m ^ or 104 ppb) appears to be conservatively protective of barley, canola and field pea from yield reductions due to short-term ethylene exposure.The interim 30-day Alberta Air Quality Ethylene Guideline (50 \ig m-3 or 44 ppb) appears to be protective of yield effects in canola and field pea; however, yield effects may occur in barley at levels below the 30-day interim Alberta Air Quality Ethylene guideline (50 \xg m-^ or 44 ppb).
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,003 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».