Minimising cold damage during reproductive development among temperate rice genotypes. I. Avoiding low temperature with the use of appropriate sowing time and photoperiod-sensitive varieties
T. C. Farrell A C , S. Fukai A and R. L. Williams BA The University of Queensland, Brisbane, School of Land and Food Sciences, Qld 4072, Australia.
B National University of East Timor, Dili, East Timor.
C Corresponding author. Email: tim.farrell@uq.edu.au
Australian Journal of Agricultural Research 57(1) 75-88 https://doi.org/10.1071/AR05185
Submitted: 27 May 2005 Accepted: 3 November 2005 Published: 30 January 2006
Abstract
Multiple-sown field trials in 4 consecutive years in the Riverina region of south-eastern Australia provided 24 different combinations of temperature and day length, which enabled the development of crop phenology models. A crop model was developed for 7 cultivars from diverse origins to identify if photoperiod sensitivity is involved in determining phenological development, and if that is advantageous in avoiding low-temperature damage. Cultivars that were mildly photoperiod-sensitive were identified from sowing to flowering and from panicle initiation to flowering. The crop models were run for 47 years of temperature data to quantify the risk of encountering low temperature during the critical young microspore stage for 5 different sowing dates. Cultivars that were mildly photoperiod-sensitive, such as Amaroo, had a reduced likelihood of encountering low temperature for a wider range of sowing dates compared with photoperiod-insensitive cultivars. The benefits of increased photoperiod sensitivity include greater sowing flexibility and reduced water use as growth duration is shortened when sowing is delayed. Determining the optimal sowing date also requires other considerations, e.g. the risk of cold damage at other sensitive stages such as flowering and the response of yield to a delay in flowering under non-limiting conditions. It was concluded that appropriate sowing time and the use of photoperiod-sensitive cultivars can be advantageous in the Riverina region in avoiding low temperature damage during reproductive development.
Additional keywords: cold tolerance, modelling.
Acknowledgments
This work was funded by the Cooperative Research Centre for Sustainable Rice Production.
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