| Full text | |
| Author(s): |
Total Authors: 2
|
| Affiliation: | [1] Univ Estadual Paulista, Inst Biociencias, Dept Bot, BR-13506900 Rio Claro, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Botanical Journal of the Linnean Society; v. 175, n. 1, p. 144-154, MAY 2014. |
| Web of Science Citations: | 8 |
| Abstract | |
Xyridaceae belongs to the xyrid clade of Poales, but the phylogenetic position of the xyrid families is only weakly supported. Xyridaceae is divided into two subfamilies and five genera, the relationships of which remain unclear. The development of the ovule, fruit and seed of Abolboda spp. was studied to identify characteristics of taxonomic and phylogenetic value. All of the studied species share anatropous, tenuinucellate and bitegmic ovules with a micropyle formed by the inner and outer integuments, megagametophyte development of the Polygonum type, seeds with a tanniferous hypostase, a helobial and starchy endosperm and an undifferentiated embryo, seed coat derived from both integuments with a tanniferous tegmen and a micropylar operculum, and fruits with a parenchymatous endocarp and mesocarp and a sclerenchymatous exocarp. Most of the ovule and seed characteristics described for Abolboda are also present in Xyris and may represent a pattern for the family. Abolboda is distinguished by the ovule type, endosperm formation and the number of layers in the seed coat, in agreement with its classification in Abolbodoideae. The following characteristics link Xyridaceae to Eriocaulaceae and Mayacaceae, supporting the xyrid clade: tenuinucellate, bitegmic ovules; seeds with a tanniferous hypostase, a starchy endosperm and an undifferentiated embryo; and a seed coat with a tanniferous tegmen. A micropylar operculum in the seeds of Abolboda is described for the first time here and may represent a synapomorphy for the xyrids. (c) 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 175, 144-154. (AU) | |
| FAPESP's process: | 11/18275-0 - Anatomy of species of Poales (monocotyledons): taxonomic implications |
| Grantee: | Vera Lucia Scatena |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 11/11536-3 - Comparative embryology of xyrids (Poales-Monocotyledons) |
| Grantee: | Aline Oriani |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |