Host Choice Selection in The Aster Yellows Pathosystem
Bibliographic record
Abstract
Phytoplasmas are obligate parasites associated with several diseases in plants and can be transmitted by hemipteran groups such as psyllids, planthoppers, and leafhoppers. In the Canadian Prairies, phytoplasma group 16SrI is the causal agent of Aster Yellows (AY) disease and is primarily transmitted by populations of aster leafhoppers (Macrosteles quadrilineatus Forbes) (Hemiptera: Cicadellidae). Given the complexity of this pathosystem, domesticated and non-domesticated plant species (Poaceae, Brassicaceae, and Asteraceae) commonly found in this geographical region were used to address questions regarding the ecology of the insect vector and the epidemiology of AY. While cereals, Arabidopsis thaliana, and a few non-domesticated species from the Asteraceae family could sustain leafhopper reproduction and development, the opposite was observed in other plant species like canola. In the presence of a second host plant, however, aster leafhoppers preferred to settle on crops over wild species, including in those combinations containing canola. In other cases, some of the less suitable host plants were preferred for settling, oviposition, or probing, suggesting that host choice selection behavior of aster leafhoppers was context dependent. Moreover, there was a disassociation between the host suitability of aster leafhoppers and that of the phytoplasmas. Additional experiments with A. thaliana lines indicated that settling and oviposition behaviors of this insect species can be altered by plant-mediated responses involving the phytohormones salicylic acid and jasmonic acid, and that insect infection with phytoplasmas can also affect these behavioral responses. Finally, the probing behavior of aster leafhopper males and females was characterized using the electropenetrography technique in combination with plant histology. These insects produced a total of nine waveforms, with two groups of them associated with xylem and phloem activities. Comparison of the number of events and duration of different waveforms between males and females revealed that their probing behavior was similar.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.002 | 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".