A study on genetic diversity of Avena germplasm resources detected by ISSR
Bibliographic record
Abstract
Genetic diversity of 42 Avena sativa varieties and 6 Avena nuda varieties from China,Canada,America,Europe and other countries was studied using inter-simple sequence repeat(ISSR) molecular markers.Eight primers detected 144 polymorphic bands,and the proportion of polymorphic fragment was 86.1%.Based on Nei's index,the average variation coefficient of A.sativa and A.nuda were 0.203 6 and 0.201 5,and of the Shannon diversity index were 0.325 9 and 0.305 8,respectively.The similarity coefficient of all cultivars was 0.583 3-0.941 7,and genetic distance was 0.060 1-0.539 0 indicating a rich genetic diversity of Avena,with A.sativa varieties having a higher genetic diversity than that of A.nuda varieties.Based on cluster and principal component analyses of the ISSR fingerprinting data,the 48 varieties could be divided into 5 groups.In most cases,accessions from the same continent were classified into the same group.The geographical distribution of genetic diversity in A.sativa and A.nuda were divided into two groups at 0.66,which was in accordance with traditional morphologic and other molecular marker classifications.The genetic relationship revealed by ISSR was consistent with that from other sources.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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".