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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Floral ontogeny and vasculature in Xyridaceae, with particular reference to staminodes and stylar appendages

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Author(s):
Sajo, M. Graca [1] ; Oriani, Aline [1] ; Scatena, Vera L. [1] ; Rudall, Paula J. [2]
Total Authors: 4
Affiliation:
[1] Univ Estadual Paulista, UNESP, Inst Biociencias, BR-13506900 Rio Claro, SP - Brazil
[2] Royal Bot Gardens, Richmond TW9 3AB, Surrey - England
Total Affiliations: 2
Document type: Journal article
Source: PLANT SYSTEMATICS AND EVOLUTION; v. 303, n. 9, p. 1293-1310, NOV 2017.
Web of Science Citations: 1
Abstract

We provide a detailed comparative study of floral ontogeny and vasculature in Xyridaceae, including Xyris, Abolboda and Orectanthe. We evaluate these data in the context of a recent well-resolved phylogenetic analysis of Poales to compare floral structures within the xyrid clade (Xyridaceae and Eriocaulaceae). Xyrids are relatively diverse in both flower structure and anatomy; many species incorporate diverse and unusual floral structures such as staminodes and stylar appendages. Xyridaceae possess three generally epipetalous stamens in a single whorl; the ``missing{''} stamen whorl is either entirely absent or transformed into staminodes. Fertile stamens each receive a single vascular bundle diverged from the median petal bundle. In Xyris, the stamen bundle diverges at the flower base, but it diverges at upper flower levels in both Abolboda and Orectanthe. In species of Abolboda that possess staminodes, staminode vasculature is closely associated with the lateral vasculature of each petal. Despite the likely sister-group relationship between Eriocaulaceae and Xyridaceae, our character optimization indicates that the stylar appendages that characterize some Xyridaceae (except Xyris and Achlyphila) are non-homologous with those of some Eriocaulaceae. On the other hand, it remains equivocal whether the loss of a fertile outer androecial whorl occurred more than once during the evolutionary history of the xyrid clade; this transition occurred either once followed by a reversal to fertile stamens in Eriocauloideae and staminodes in some Xyridaceae, or twice independently within both Xyridaceae and Eriocaulaceae. (AU)

FAPESP's process: 11/11536-3 - Comparative embryology of xyrids (Poales-Monocotyledons)
Grantee:Aline Oriani
Support Opportunities: Scholarships in Brazil - Post-Doctoral