Effect of plant age on resistance to<i>Ascochyta rabiei</i>in chickpea
Bibliographic record
Abstract
The impact of plant age on resistance to ascochyta blight of chickpea (Cicer arietinum) was assessed on kabuli cvs. UC27 (susceptible) and Sanford and B90 (partially resistant) and desi cv. Myles (partially resistant) using two isolates of Ascochyta rabiei. Tests were conducted under controlled conditions and in field trials in 1999 and 2000. Seed was sown at regular intervals to produce plants at different growth stages (seedling, vegetative, flowering, podding), which were all inoculated at the same time in randomized complete block experiments with four replications. Cultivar UC27 was highly susceptible at all stages of plant development. However, plant age had a large impact on the reaction of resistant cultivars to A. rabiei. In growth chamber studies, blight severity was low in seedlings of the resistant cultivars (range, 4-20%) and highest in podding plants (41-82%) 2 weeks after inoculation. In the field trials, severity at 2 weeks after inoculation showed a similar pattern, with mean severity among resistant cultivars ranging from 1 to 2% in seedlings and 3 to 28% in podding plants. Severity at 8 weeks after inoculation on plants of resistant cultivars inoculated as seedlings was low (6-14% in 1999, 10-23% in 2000) relative to those inoculated at podding (65-91% in 1999; 54-83% in 2000) in the field trials. These results indicate that resistance decreases with plant age in the partially resistant chickpea cultivars adapted to western Canada and that resistance alone may not provide adequate disease control.
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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".