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Juvenility and flowering of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae) in relation to vernalization and daylength


Cave, RL and Birch, CJ and Hammer, GL and Erwin, JE and Johnston, ME, Juvenility and flowering of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae) in relation to vernalization and daylength, Annals of Botany, 108, (1) pp. 215-220. ISSN 0305-7364 (2011) [Refereed Article]

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DOI: doi:10.1093/aob/mcr116


Background and Aims: The time at which plants are transferred to floral inductive conditions affects the onset of flowering and plant morphology, due to juvenility. Plants of Brunonia australis and Calandrinia sp. were used to investigate whether Australian native ephemeral species show a distinct juvenile phase that can be extended to increase vegetative growth and flowering.

Methods: The juvenile phase was quantified by transferring seedlings from less inductive (short day and 30/ 208C) to inductive (vernalization or long day) conditions at six different plant ages ranging from 4 to 35 d after seed germination. An increase in days to first visible floral bud and leaf number were used to signify the end of juvenility.

Key Results: Brunonia australis was receptive to floral inductive long day conditions about 1822 d after seed germination, whereas plants aged 435 d appeared vernalization sensitive. Overall, transferring plants of B. australis from short to long day conditions reduced the time to anthesis compared with vernalization or constant short day conditions. Calandrinia sp. showed a facultative requirement for vernalization and an insensitive phase was not detected. Floral bud and branch production increased favourably as plant age at time of transfer to inductive conditions increased. Younger plants showed the shortest crop production time.

Conclusions: Both species can perceive the vernalization floral stimulus from a very young age, whereas the photoperiodic stimulus is perceived by B. australis after a period of vegetative growth. However, extending the juvenile phase can promote foliage development and enhance flower production of both species.

Item Details

Item Type:Refereed Article
Keywords:Brunonia australis, Calandrinia sp., juvenility, flowering, leaf number, photoperiod, vernalization
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Ornamentals, natives, flowers and nursery plants
UTAS Author:Birch, CJ (Associate Professor Colin Birch)
ID Code:70365
Year Published:2011
Web of Science® Times Cited:7
Deposited By:Agricultural Science
Deposited On:2011-06-16
Last Modified:2017-11-02

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