Aberrant Male Meiosis, Pollen Sterility and Variable Sized Pollen Grains in Clematis montana Buch.-Ham. ex DC. from Dalhousie hills, Himachal Pradesh
Bibliographic record
Abstract
Chromosomal studies on Clematis montana from Dalhousie hills, Himachal Pradesh, India have led to the identification of an accession that exhibited aberrant male meiosis, pollen sterility and heterogeneous sized fertile pollen grains. The accession, which exists at diploid level (n=8), depicts the phenomenon of cytomixis involving chromatin transfer among proximate meiocytes (PMs). The chromatin transfer in the PMCs has also caused various meiotic irregularities like chromatin stickiness, interbivalent connections, unorganized and pycnotic chromatin, laggards/chromatin bridges during anaphases/telophases, micronuclei and included micronuclei in microspores, triads and polyads. Consequent to cytomixis and associated meiotic irregularities, the products of PMCs result in some pollen sterility and variable sized fertile pollen grains. Though the Cytological status of such variable sized pollen grains could not be ascertained at present, the large sized pollen grains, which are almost double sized, may be of ‘2n’ constitution and play an important role in the origin of intraspecific polyploidy in the species. The small sized fertile pollen grains which are the products of hypoploid PMCs could lead to the origin of aneuploids. Similar effects of cytomixis on meiotic course resulting in pollen malformation have been reported earlier in a number of species by the authors from this laboratory.
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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) | 0.002 | 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 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".