Micromorphological evidence for androecium origin of Claytonia (Montiaceae) petaloids

  • Patrícia dos Santos Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh EH3 5LR, Scotland, UK. Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
  • Sam Brockington Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
  • Beverley Glover Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
  • Louis P. Ronse de Craene Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh EH3 5LR, Scotland, UK
DOI: https://doi.org/10.5281/zenodo.162714

Abstract

Caryophyllales is an order distinguished for having flowers with only one perianth whorl – the perigone. The perigone is a calyx derived structure that can have either petaloid or sepaloid appearance. Members of the Portulacinae suborder have tendency to have a false bipartite perianth, forming a petaloid perigone and an epicalyx with the subtending bracts of the flower. Although Claytonia belongs to the Portulacinae suborder, previous studies have suggested a different origin for its petaloid organs other than the sepals. In this study we investigated the floral development of Claytonia sibirica and Claytonia perfoliata using Scanning Electron Microscopy (SEM) to understand the origin of the petaloid organs in the genus. Our results show that petaloid organs in Claytonia are of androecium origin and can be interpreted as the expression of the typical Caryophyllales’ perigone growing in androecium tissue.

References

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Fig. 1. Claytonia sibirica (A-F and I) and Claytonia perfoliata (G-H) SEM figure plate. A-B – inflorescence; C-D – stamen and carpel early development; E-G – petaloid initiation from the base of the stamens; H-I – growth of petaloids and full developed flower. (White bar A–I = 100µm). Br = bracteoles; α = petaloids; ✴ = stamens and stamen primordia; G = gynoecium and gynoecium primordium.
Published
2012-04-01
How to Cite
DOS SANTOS, Patrícia et al. Micromorphological evidence for androecium origin of Claytonia (Montiaceae) petaloids. Modern Phytomorphology, [S.l.], v. 1, p. 23-25, apr. 2012. ISSN 2227-9555. Available at: <http://ojs.phytomorphology.org/index.php/MP/article/view/439>. Date accessed: 11 apr. 2018. doi: https://doi.org/10.5281/zenodo.162714.
Citation Formats
Issue
Vol 1 (2012)
Section
Correspondences
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