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Comparative floral development and structure of the black mangrove genus Avicennia L. and related taxa in the Acanthaceae
Stockholm University, Faculty of Science, Department of Botany.
2011 (English)In: International journal of plant sciences, ISSN 1058-5893, E-ISSN 1537-5315, Vol. 172, no 3, 330-344 p.Article in journal (Refereed) Published
Abstract [en]

Phylogenetic relationships of Avicennia have been difficult to trace because of the presence of convergent characters related to the mangrove environment. Recent molecular data suggest a close relationship to Thunbergioideae, a subfamily within Acanthaceae (Lamiales), but morphological support for the new findings has been equivocal. Floral structure and development are comparatively studied here in three species of Avicennia, with special attention given to the ovary and the ovules, which are also studied in Thunbergioideae. The suggested sister group relationship of Avicennia and Thunbergioideae is supported by three synapomorphies: (1) collateral ovule arrangement, (2) vertical orientation of ovule curvature, and (3) an exposed nucellus that is contiguous with the ovary wall, at least during early stages of ovule development. We interpret the latter character as a neotenic feature that is retained in the anthetic ovules of Avicennia. We confirm that the apparently tetramerous flowers of Avicennia have a basically pentamerous floral ground plan. Additional floral characters shared between Avicennia and Thunbergioideae include left contort corolla aestivation, thickened filament bases with glandular hairs, presence of pollen sac placentoids, and various aspects of fruit morphology and embryology. However, these features are either symplesiomorphic or are not known well enough to allow for unequivocal conclusion on character evolution in Acanthaceae.

Place, publisher, year, edition, pages
2011. Vol. 172, no 3, 330-344 p.
Keyword [en]
asterids, floral anatomy, Lamiales, neoteny, ovule development, Thunbergioideae
National Category
Botany
Identifiers
URN: urn:nbn:se:su:diva-69430DOI: 10.1086/658159ISI: 000292654700003OAI: oai:DiVA.org:su-69430DiVA: diva2:478259
Note
authorCount :2Available from: 2012-01-16 Created: 2012-01-12 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Evolutionary relationships in Thunbergioideae and other early branching lineages of Acanthaceae
Open this publication in new window or tab >>Evolutionary relationships in Thunbergioideae and other early branching lineages of Acanthaceae
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Acanthaceae as circumscribed today consists of the three subfamilies Acanthoideae (Acanthaceae sensu stricto), Thunbergioideae and Nelsoniodieae, plus the genus Avicennia. Due to the morphological dissimilarities of Thunbergioideae and Nelsonioideae, the delimitation of the family has been controversial. The mangrove genus Avicennia was only recently associated with Acanthaceae for the first time, based on molecular evidence, but without morphological support. In this thesis, phylogenetic analyses of nuclear and chloroplast DNA sequences were used to test the monophyly and exact positions of Thunbergioideae and Nelsonioideae, and to infer detailed phylogenetic relationships within these subfamilies and among major lineages of Acanthaceae. Floral structure and development were comparatively studied in Avicennia and other Acanthaceae using scanning electron microscopy and stereo microscopy. Phylogenetic analyses strongly support monophyly of Thunbergioideae and Nelsonioideae, and place the latter clade with strong support as sister to all other plants treated as Acanthaceae. Thunbergioideae and Avicennia are moderately supported as sister taxa, and together they are sister to Acanthoideae. The general morphology of Avicennia can be easily accommodated in the Acanthaceae, and three synapomorphies support the suggested sister group relationship of Avicennia and Thunbergioideae: (1) collateral ovule arrangement, (2) vertical orientation of ovule curvature, and (3) an exposed nucellus that is contiguous with the ovary wall. Within Thunbergioideae and Nelsonioideae, support values for major lineages are generally high. With some exceptions, the constituent genera are supported as monophyletic. Evolutionary relationships among and within genera are discussed in a morphological and biogeographical context.

Place, publisher, year, edition, pages
Department of Botany, Stockholm University, 2012. 29 p.
National Category
Botany
Research subject
Plant Systematics
Identifiers
urn:nbn:se:su:diva-71080 (URN)978-91-7447-445-9 (ISBN)
Public defence
2012-03-02, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of doctoral defence, the following papers were unpublished and had a status as follows: Papers 2 & 3: ManuscriptsAvailable from: 2012-02-08 Created: 2012-01-25 Last updated: 2012-02-17Bibliographically approved

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