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Article: Imprimé

Only seed size matters for germination in different populations of the dimorphic Tragopogon pratensis subsp. pratensis (Asteraceae) / Tamara van Mölken in American Journal of Botany, 92 (3) (March 2005)

Article (2005)

[article]
inAmerican Journal of Botany > 92 (3) (March 2005) . - 432-437

Titre :	Only seed size matters for germination in different populations of the dimorphic Tragopogon pratensis subsp. pratensis (Asteraceae)
Type de document :	Imprimé
Auteurs :	Tamara van Mölken (1979-) ; Linda D. Jorritsma-Wienk ; Paul H. W. van Hoek (1959-) ; Hans de Kroon (1959-)
Année de publication :	2005
Article en page(s) :	432-437
Langues :	Anglais (eng)
Catégories :	[CBNPMP-Thématique] Germination
Mots-clés :	Tragopogon pratensis subsp. pratensis
Résumé :	Many studies have focused on the ecology of seed dimorphism, the production of two seed types by a single plant. Morphology and seed size are usually correlated, but how morphology affects germination percentage and seedling growth is poorly understood. Here we explicitly separate these effects for nine populations of the dimorphic species Tragopogon pratensis subsp. pratensis. Larger seeds yielded higher germination percentages, yet seed morphology had no additional direct effect on germination. Neither seed size nor seed morphology affected seedling growth. Neither germination nor seedling growth varied among populations, but seed head varied significantly. Results show that germination is mainly controlled by seed size rather than by seed morphology. This study is one of the few to distinguish explicitly between seed size and seed morphology effects on ecological characteristics and suggests that seed dimorphism may exert its ecological effects predominantly through its correlated size.
Identifiant :	DOI : 10.3732/ajb.92.3.432
Permalink :	https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=153139

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