Embryology of some flowers of the Gardenieae complex (Rubiaceae).
Megagametogenesis
Megasporogenesis
Ovule
Stigma
Style
Journal
Protoplasma
ISSN: 1615-6102
Titre abrégé: Protoplasma
Pays: Austria
ID NLM: 9806853
Informations de publication
Date de publication:
Sep 2022
Sep 2022
Historique:
received:
03
09
2021
accepted:
30
12
2021
pubmed:
13
1
2022
medline:
20
8
2022
entrez:
12
1
2022
Statut:
ppublish
Résumé
Different breeding systems occur in the Gardenieae complex (Rubiaceae), from homoecy to dioecy which is present in two tribes, Gardenieae and Cordiereae. As part of a broad project focused on the reproductive anatomy of the species of these two tribes, we described the structural and functional differences of the gynoecium in the different floral morphs and determined the degree of gynoecium development in the staminate flowers. We conducted a comparative anatomical study focused on the gynoecium of one homoecious species (Tocoyena formosa, with perfect flowers) and three dioecious species (Genipa americana, Randia calycina, and Randia heteromera) of Gardenieae and one dioecious species (Cordiera concolor) of Cordiereae. The dioecious species have flowers that are morphologically perfect and functionally unisexual. Flowers in successive stages of development were collected, photographed, and fixed in formalin-acetic acid-alcohol. The material was examined using light microscopy and scanning electron microscopy. The anatomy of the ovary, style, and stigma was analyzed, and megasporogenesis and megagametogenesis were studied. The results achieved in this study, together with previously obtained data of the androecium, show that dioecy originated from homoecy in these species, since the unisexual flowers conserve some characteristics of the perfect flowers. In addition, a new type of ovule for the Rubiaceae family is described.
Identifiants
pubmed: 35018497
doi: 10.1007/s00709-022-01734-5
pii: 10.1007/s00709-022-01734-5
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1233-1254Informations de copyright
© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.
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