Influence of light and temperature on seed germination and ability of the endangered plant species <i>Sisymbrium cavanillesianum</i> to form persistent soil seed banks<sup>1</sup>
Bibliographic record
Abstract
AbstractThe study of germination and soil seed bank ecology is of particular interest when dealing with threatened plant species, since it should provide essential information for designing effective conservation actions. Within this context, a comparative study on germination in response to light and temperature conditions simulating those in nature was carried out on the narrowly distributed endemic arable weed Sisymbrium cavanillesianum (Brassicaceae) and on the geographically widespread S. runcinatum. Seeds were periodically tested for germination from 0 month (freshly matured seeds) to 16 months from collection. The study was supplemented with an S. cavanillesianum seed soil-burial experiment and an assessment of the persistent soil seed bank of both Sisymbrium species in the natural habitat. Results revealed that S. cavanillesianum seeds may have physiological dormancy that markedly reduces germination of young seeds at high temperatures (32-18°C). In general, seeds of S. cavanillesianum reached higher final germination percentages than those of S. runcinatum, so seed-germination restrictions or difficulties should be rejected as a reason for explaining the rarity of S. cavanillesianum. Both the seed-burial experiment and the analysis of soil samples from the natural habitat showed that S. cavanillesianum has the capacity to form short-term persistent seed banks, which play a crucial role in the maintenance of populations of this threatened species periodically disturbed by agricultural practices.RésuméL’étude de la germination et de l’écologie des réservoirs de graines dans le sol suscite toujours de l’intérêt chez ceux qui se préoccupent des espèces menacées de disparition, car elle peut fournir des informations essentielles pour l’élaboration des plans de conservation. Dans ce contexte, nous avons mené une étude comparative sur la germination de deux espèces végétales en réponse à des conditions de luminosité et de température simulant celles observées en nature. Nous avons choisi une plante endémique à répartition restreinte, soit Sisymbrium cavanillesianum (Brassicaceae), et une plante largement répandue, S. runcinatum. Nous avons testé de façon périodique le potentiel de germination des graines dès leur récolte (temps 0 : graines fraîchement parvenues à maturité) et jusqu’à 16 mois plus tard. Nous avons aussi semé des graines de S. cavanillesianum en plus de faire le point sur la viabilité du réservoir de graines en milieu naturel des deux espèces de Sisymbrium. Les graines de S. cavanillesianum peuvent entrer en dormance physiologique, ce qui nuit grandement à la germination des jeunes graines à haute température (32-18°C). En général, les graines de S. cavanillesianum ont des taux de germination plus élevés que celles de S. runcinatum. On ne peut donc expliquer la rareté de S. cavanillesianum par des contraintes ou des difficultés associées à la germination des graines. L’expérience des semis et l’analyse des échantillons de sol en provenance d’un habitat naturel montrent que S. cavanillesianum a la capacité de former des réservoirs de graines qui persistent à court terme. Il s’agit d’une caractéristique fort importante pour le maintien des populations de cette espèce menacée qui est affectée de façon régulière par les pratiques agricoles.Key Words: arable weedconditional seed dormancydisturbanceseed burialSisymbrium runcinatumMots-clés: dormance conditionnelle des grainesmauvaise herbe des culturesperturbationsemisSisymbrium runcinatum
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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) | 0.000 | 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".