Characterization of the loss of seedling vigor in pea (<i>Pisum sativum</i> L.)
Bibliographic record
Abstract
The physiological age of pea (Pisum sativum L.) seeds was accelerated using high temperature and relative humidity (RH), resulting in a range of vigor classes within one seed lot. This differentially aged seed was then used to determine the impact of seed vigor on plant growth and yield. For seeds incubated at 38°C for 2, 4, or 6 d at 100% RH prior to germination (accelerated aging), the percentage germination and rate of seedling emergence decreased with increasing time of aging. Aging at 38°C decreased seed vigor as indicated by reduced seedling root and shoot growth relative to higher-vigor seeds aged at 20°C. The respiration rate of seeds aged at 38°C was significantly higher than that of seeds aged at 20°C throughout the 6-d aging interval. However, no differences in respiration were evident during subsequent germination among the seeds aged at 38°C for 0, 2, 4, or 6 d. The higher-vigor seeds aged at 20°C had a higher respiration rate than those aged at 38°C during subsequent germination. Seeds that expressed high and low vigor in controlled-environment conditions showed similar trends in the field; however, seed vigor had no significant effect on total seed yield over two growing seasons. These data indicate that under certain conditions, the loss in seed vigor can be substantial without affecting overall yield, due to the plasticity of vegetative and reproductive growth in pea. Key words: Germination, pea, Pisum sativum, seeds, seedling vigor, respiration
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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) | 0.000 | 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 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".