A cytogenetic study of five species of Machaeranthera and their Fb1s hybrids
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Notice bibliographique
Résumé
In the most recent taxonomic treatment by Hartman (1976), Machaeranthera was divided into subgenera and sections.Section Machaeranthera of the subgenus Machaeranthera contains two annual species with chromosome numbers of 2n = 8.M^. tanacetifolia (H.B.K.) Nees and M^.tagetina Greene.In one cross each between one species from Arizona and one from New Mexico, their artificial hybrids were only 3-12 fertile (Stucky, 1978).A similar degree of fertility (6.6%) has been found in hybrids between these two species (Jackson, 1962).In addition, both species have been crossed to M^. arida (2n = 10) of the section Arida, and the pollen fertility of M^. arida X M. tanacetifolia and M. arida X M. tagetina was 5.5 and 0.4%, respectively (Jackson, 1962).Crosses of {1.tanacetifolia to annual and perennial yellow-rayed species of the spinulosus group of Haplopappus gave F^ artificial hybrids with 0.083 to 0.628% pollen fertility (Jackson.pers.comm.).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.
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 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 découle