Floral ontogeny of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae)

Cave, Robyn L., Birch, Colin J., Hammer, Graeme L., Erwin, John E. and Johnston, Margaret E. (2010) Floral ontogeny of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae). Australian Journal of Botany, 58 1: 61-69. doi:10.1071/BT09211

Author Cave, Robyn L.
Birch, Colin J.
Hammer, Graeme L.
Erwin, John E.
Johnston, Margaret E.
Title Floral ontogeny of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae)
Formatted title
Floral ontogeny of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae)
Journal name Australian Journal of Botany   Check publisher's open access policy
ISSN 0067-1924
Publication date 2010
Sub-type Article (original research)
DOI 10.1071/BT09211
Volume 58
Issue 1
Start page 61
End page 69
Total pages 9
Place of publication Collingwood, VIC, Australia
Publisher CSIRO Publishing
Collection year 2011
Language eng
Formatted abstract
Floral ontogeny of Brunonia australis Sm. ex R.Br. (blue pincushion) and Calandrinia sp. (not yet fully classified) was investigated by scanning electron microscopy to assist further efforts for manipulating flowering of these potential floriculture crops. This is the first work to study floral initiation and the stages of flower development for these species. Floral initiation of B. australis commenced 28 days after seed germination when grown at 25/10 or 35/20°C (day/night) under long days (11h of ambient light at 553±45μmolm-2s-1, plus a 5-h night break at 4.5molm-2s-1). Leaf number at floral initiation reflected differences in the accumulated thermal time between treatments so that about double the number of leaves formed at 35/20°C. This suggested differing temperature responses for leaf and phenological development, and that leaf number was not a good indicator of floral initiation. For Calandrinia sp., floral initiation commenced 47 days after seed germination when grown at 25/10°C. Hot temperatures (35/20°C) inhibited flowering; indicating a vernalisation requirement. For B. australis, the pattern of floret development was centripetal, with flowers organised into five whorls. Four bracts surrounded each flower, whereas the sepals, petals and stamens showed a pentamerous arrangement. A central style was terminated by an indusial stigmatic presenter. Flowers of Calandrinia sp. consisted of four whorls, namely two sepals, 8-10 petals, numerous stamens produced centrifugally and a central syncarpous gynoecium with four stigmatic branches. © 2010 CSIRO.
Keyword High-temperature exposure
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
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Created: Sun, 28 Mar 2010, 00:07:31 EST