Gender specialisation and stigma height dimorphism in Mediterranean Lithodora fruticosa (Boraginaceae).

Détails

Ressource 1Télécharger: Pannell-2018-Plant_Biology.pdf (311.18 [Ko])
Etat: Serval
Version: Final published version
ID Serval
serval:BIB_209309C07066
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Gender specialisation and stigma height dimorphism in Mediterranean Lithodora fruticosa (Boraginaceae).
Périodique
Plant Biology
Auteur(s)
Pannell J.R.
ISSN
1438-8677 (Electronic)
ISSN-L
1435-8603
Statut éditorial
Publié
Date de publication
2018
Peer-reviewed
Oui
Volume
20 Suppl 1
Pages
112-117
Langue
anglais
Résumé
Dimorphism in style height has evolved repeatedly in flowering plants, with some individuals having short and others long styles; in the case of distylous species, stigma position varies reciprocally with that of the anthers. Distyly can be associated with divergence in the functional gender between long- and short-styled individuals, but gender divergence has rarely been investigated in species with a simple stigma height polymorphism in the absence of reciprocal dimorphism in anther position. To evaluate the relation between stigma height polymorphism and gender, I measured the dimensions of floral morphology and seed production for the two morphs of a large population of the Iberian species Lithodora fruticosa (Boraginaceae). Results confirm the existence of a stigma height polymorphism in L. fruticosa, with long- and short-styled individuals at a 1:1 ratio in the studied population. Long-styled individuals produced substantially more seeds than did short-styled individuals, pointing to strong divergence in functional gender between the two morphs. The results of this study are puzzling in light of recent work that suggests that L. fruticosa has a multi-allelic self-incompatibility system. I discuss the significance of gender divergence in L. fruticosa and evaluate hypotheses that might explain it.

Mots-clé
Dioecy, distyly, functional gender, pollen limitation, sex allocation
Pubmed
Web of science
Open Access
Oui
Création de la notice
18/01/2018 11:48
Dernière modification de la notice
08/05/2019 15:36
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