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Modelling temperature, photoperiod and vernalization responses of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae) to predict flowering time

Citation

Cave, RL and Hammer, GL and McLean, G and Birch, CJ and Erwin, JE and Johnston, ME, Modelling temperature, photoperiod and vernalization responses of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae) to predict flowering time, Annals of Botany, 111, (4) pp. 629-639. ISSN 0305-7364 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 the authors.

DOI: doi:10.1093/aob/mct028

Abstract

Background and Aims: Crop models for herbaceous ornamental species typically include functions for temperature and photoperiod responses, but very few incorporate vernalization, which is a requirement of many traditional crops. This study investigated the development of floriculture crop models, which describe temperature responses, plus photoperiod or vernalization requirements, using Australian native ephemerals Brunonia australis and Calandrinia sp.

Methods: A novel approach involved the use of a field crop modelling tool, DEVEL2. This optimization program estimates the parameters of selected functions within the development rate models using an iterative process that minimizes sum of squares residual between estimated and observed days for the phenological event. Parameter profiling and jack-knifing are included in DEVEL2 to remove bias from parameter estimates and introduce rigour into the parameter selection process.

Key Results: Development rate of B. australis from planting to first visible floral bud (VFB) was predicted using a multiplicative approach with a curvilinear function to describe temperature responses and a broken linear function to explain photoperiod responses. A similar model was used to describe the development rate of Calandrinia sp., except the photoperiod function was replaced with an exponential vernalization function, which explained a facultative cold requirement and included a coefficient for determining the vernalization ceiling temperature. Temperature was the main environmental factor influencing development rate for VFB to anthesis of both species and was predicted using a linear model.

Conclusions: The phenology models for B. australis and Calandrinia sp. described development rate from planting to VFB and from VFB to anthesis in response to temperature and photoperiod or vernalization and may assist modelling efforts of other herbaceous ornamental plants. In addition to crop management, the vernalization function could be used to identify plant communities most at risk from predicted increases in temperature due to global warming.

Item Details

Item Type:Refereed Article
Keywords:Brunonia australis, Calandrinia sp., modelling, flowering, phenology, temperature, photoperiod, vernalization
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Biology not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural Crops
Objective Field:Ornamentals, Natives, Flowers and Nursery Plants
Author:Birch, CJ (Associate Professor Colin Birch)
ID Code:86843
Year Published:2013
Web of Science® Times Cited:6
Deposited By:TIA - Research Institute
Deposited On:2013-10-28
Last Modified:2014-04-08
Downloads:0

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