An Analysis of Auxin Distribution and Activity during Photomorphogenesis and Skotomorphogenesis in the moss, Physcomitrella patens
Bibliographic record
Abstract
Plant development varies depending on whether it occurs in the light (photomorphogenesis) or in the dark (skotomorphogenesis). This phenomenon has been studied in depth in flowering plants such as Arabidopsis thaliana but remains largely unexplored in more ancient plant groups such as the bryophytes, which include the model moss, Physcomitrella patens, despite decades-old awareness of the markedly different gametophytic morphologies that result from photomorphogenesis and skotomorphogenesis in this moss. Research undertaken with Arabidopsis has elucidated in detail roles for various phytohormones, including auxin, in regulating the reversible developmental interconversion of photomorphogenesis and skotomorphogenesis. By contrast, although auxin has previously been shown to be active at many stages of Physcomitrella development, its specific involvement in photomorphogenesis and skotomorphogenesis and their interconversion, especially in relation to gametophore development, is unknown. Through the use of transgenic auxin-responsive GUS reporter strains in conjunction with auxin signalling and polar transport inhibitors it was shown that auxin is critically important for the development of gametophore stems and leaves in Physcomitrella during photomorphogenesis but it has a diminished role in leaf development and is not required for stem elongation during skotomorphogenesis. However, auxin is required for the gametophore bud to leafy gametophore transition in a dark-dependent manner and for protonemal development both in the dark and in the light. The roles of auxin in development of the moss gametophore are very similar to those in hypocotyl elongation in Arabidopsis, implying that they are ancient and have been highly conserved during land plant evolution.
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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 | 0.000 | 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) | 0.001 | 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".