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- Title
New records of pollen tube shower in species of Bertolonia (Melastomataceae) suggest that autogamy may be the rule in the genus.
- Authors
Passos, Luan Salles; Goldenberg, Renato; Bacci, Lucas F.; Telles, Francismeire Jane; Maia, Fabiano Rodrigo
- Abstract
Previous molecular phylogenetic analyses showed that Bertolonia (Melastomataceae), an endemic genus to the Brazilian Atlantic Forest (AF) with 35 species, presents a strong correlation regarding species distribution and some floral traits. The same analyses showed that all species belong to three clades: marmorata (species mostly distributed in northern AF), formosa (species only occurring in central AF), and nymphaeifolia (species mostly distributed in southern AF). A rare delayed selfing mechanism, the pollen tube shower (PTS), was recently described for two species in the nymphaeifolia clade; however, this mechanism may also be prevalent in species of the other clades. Here, we investigated the potential occurrence of PTS in two other species of the genus: B. violacea (marmorata clade) and B. acuminata (nymphaeifolia clade). We also investigated species, as well as herbarium specimens, searching for potential evidence of floral traits that could suggest the presence of an autonomous selfing mechanism in other Bertolonia species. Both B. violacea and B. acuminata produced seeds through PTS. We also observed the occurrence of PTS in two exsiccates from two different species: B. maculata (marmorata clade) and Bertolonia sp. Taxonomic data across all clades of the genus indicate the absence of herkogamy, presence of post-anthesis petal closure and corolla persistence on the floral receptacle, all traits associated with the occurrence of PTS. We present here empirical evidence and descriptions of floral traits that indicate that the genus Bertolonia is predominantly autogamous, an uncommon characteristic in Melastomataceae.
- Publication
Plant Systematics & Evolution, 2022, Vol 308, Issue 5, p1
- ISSN
0378-2697
- Publication type
Article
- DOI
10.1007/s00606-022-01829-9