Striking genetic homogeneity in the widespread South American bracken.
Am J Bot
; 111(7): e16374, 2024 Jul.
Article
en En
| MEDLINE
| ID: mdl-39001581
ABSTRACT
PREMISE Bracken (Pteridium, Dennstaedtiaceae) is a cosmopolitan genus of aggressive disturbance colonizers that are toxic to agricultural livestock. The taxonomy of Pteridium has been treated in multiple schemes, ranging from one to six species worldwide, with numerous subspecies and varieties. Recent work has focused on the worldwide distribution and systematics of the bracken fern, but South America has been poorly represented. We present the first continent-wide sampling and analysis of Pteridium esculentum, a Southern Hemisphere diploid species. METHODS:
Within South America, P. esculentum has several morphotypes, distinguished into subspecies by variation in indument and lamina architecture. We used double digest restriction site-associated DNA sequencing (ddRADSeq) to assess the phylogenetic relationships of P. esculentum subspecies.RESULTS:
We found a striking genetic homogeneity in the species, being able to support only two morphotypes from molecular data P. e. arachnoideum and P. e. campestre. We had high confidence for shallow and deep phylogenetic relationships, but less support for relationships among crown groups.CONCLUSIONS:
We describe an east-west geographic pattern that would explain the relationships between populations; and, in contrast to previous studies, we detected differences with P. esculentum from Australia. These results will lay the foundations for studying variations in this species' behavior as a weed, as well as its impact on the production of agricultural livestock in South America.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Filogenia
/
Pteridium
País como asunto:
America do sul
Idioma:
En
Año:
2024
Tipo del documento:
Article