Seed cone structure in conifers in relation to development and pollination: a biological approach
Bibliographic record
Abstract
Seed production in conifers involves an extended sequence of developmental events that may take as long as 3 years to complete. There is a conflict between two major processes: initial pollination of ovules and subsequent maturation of seeds after fertilization. The conflict arises because ovules must be exposed at first to receive pollen (the gymno-ovulate condition), and subsequently seeds must be protected during maturation (the angiospermous condition). The "Florin model", which shows that the coniferous cone was ancestrally a compound structure, provides a constructional "Bauplan" whose modifications can be understood by developmental study. In the majority of conifers there is no consistent ovule-bearing structure, even though this is required by the model; much of cone ontogeny is determined by intercalary meristematic activity that results in cone closure after pollination. Two main constructional types can be recognized. In Cephalotaxaceae, Cupressaceae, Sciadopityaceae, Taxaceae, and Taxodiaceae (all without saccate pollen), pollen structure and function is uniform and not associated with special modification of the ovulate cone at the time of pollen capture. In the Pinaceae and Podocarpaceae (mostly with saccate pollen), the ovulate cone is usually highly specialized with regard to pollen capture. In the former group, developmental emphasis is on postpollination events that lead to seed protection or are associated with seed dispersal. In the latter group, there is a duality in ovulate cone morphology, initially associated with pollination, and subsequently with seed protection and dispersal. The general conclusion is that the coniferous cone cannot be treated as a static entity for comparative purposes. The functional attributes of cone structures need to be considered in a very broad context when the evolution of the coniferous cone is discussed.Key words: conifers, development, pollen capture, seed cone.
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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 | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 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".