A cytogenetic study of five species of Machaeranthera and their Fb1s hybrids
Notice bibliographique
Résumé
III. RESULTS Machaeranthera tanacetifolia is a widely ranging species, occurring in disturbed habitats from Central Mexico to the Canadian border and through the high plains of the United States.M. tagetina, on the other hand, is more restricted and is found only in eastern Arizona, New Mexico, and most likely extends into suitable habitats of bordering northern Mexico.Other species used in this study are M^.parthenium Greene, 2n = 8, M. viscida (Woot.& Standl.)Hartman, 2n = 8, and M. aquifolia Greene, 2n = 8.M^. parthenium, with a restricted distribution in Arizona, was included as a synonym of M^. tanacetifolia (Hartman, 1976).il-viscida was considered to belong to the Haplopappus phyllocephalus complex (Waterfall, 1943), but was placed under H^.spinulosus by Hall (1928).Jackson (1966, 1969) included M. viscida in the section Ha^ vardii.Hartman (1976) using evidence of morphology and karyotype along with chemical data placed M^. viscida in the subgenus Sideranthus of Machaeranthera.M^. aquifolia, a short-lived perennial species, was included in the genus Machaeranthera (Wooton & Standley, 1915).Objectives of this study were to a) determine chromosomal relationships of annuals by examining hybrids between M^. tagetina, M^. tanacetifolia, M^. parthenium, and M^.viscida, b) examine cytogenetic relationships between annual species and a representative perennial species, M^. aguifolia, c) determine if M^. viscida belongs in the genus and if so, identify the appropriate phylogenetic position, d) determine the amount of cytologically visible chromosomal repatterning that may have occurred during the evolution of annual species from perennial species by examining annual X perennial hybrids.Machaeranthera tanacetifolia is a widely ranging species, occurring in disturbed habitats from Central Mexico to the Canadian border and through the high plains of the United States.M. tagetina, on the other hand, is more restricted and is found only in eastern Arizona, New Mexico, and most likely extends into suitable habitats of bordering northern Mexico.Other species used in this study are M.-parthenium Greene, 2n = 8, M. viscida (Woot.& Standl.)Hartman, 2n = 8, and M. aquifolia Greene, 2n = 8.M.. parthenium, with a restricted distribution in Arizona, was included as a synonym of M^. tanacetifolia (Hartman, 1976).M. viscida was considered to belong to the Haplopappus phyllocephalus complex (Waterfall, 1943), but was placed under H_.spinulosus by Hall (1928).Jackson (1966, 1969) included M. viscida in the section Ha^^ vardii.Hartman (1976) using evidence of morphology and karyotype along with chemical data placed M^. viscida in the subgenus Sideranthus of Machaeranthera.M. aquifolia, a short-lived perennial species, was included in the genus Machaeranthera (Wooton & Standley, 1915).Objectives of this study were to a) determine chromosomal relationships of annuals by examining hybrids between Ml. tagetina, M^. tanacetifolia, M^. parthenium, and M^.viscida, b) examine cytogenetic relationships between annual species and a representative perennial species, M^. aquifolia, c) determine if M^. viscida belongs in the genus and if so, identify the appropriate phylogenetic position, d) determine the amount of cytologically visible chromosomal repatterning that may have occurred during the evolution of annual species from perennial species by examining annual X perennial hybrids.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».